#linuxcnc | Logs for 2016-03-06

[02:28:03] <XXCoder> interesting http://woodgears.ca/lathe/refine.html
[02:29:47] <pink_vampire> hi XXCoder
[02:29:54] <XXCoder> hey
[02:30:06] <pink_vampire> do you want to see how I combine 2 hobbies?
[02:30:19] <pink_vampire> http://imgur.com/Ri7wZIu
[02:30:24] <pink_vampire> XXCoder: ^
[02:31:22] <XXCoder> heh ok
[02:42:56] <Deejay> moin
[02:53:32] <yasnak> only one machine running
[02:58:58] <yasnak> pink_vampire, is having that long of nails and metal working such a good idea? I barely have finger nails left and I still seem to snag them on everything...
[02:59:12] <yasnak> jw. not judging :P
[03:27:49] <wicki> hi again...
[03:29:37] <wicki> is here anybody who is using tangentkins?
[03:32:35] <archivist> better to ask the real question rather than a survey type question
[03:40:39] <wicki> maybe... but may also be, that nobody here has ever used or even knows about the existence of tangentkins...
[03:42:52] <archivist> people know the docs, and know the uses, the real question can probably be answered by others as well
[03:45:15] <yasnak> lol
[03:46:24] <archivist> it is a damned struggle sometimes
[03:46:30] <wicki> the last docs of tangentkins I found are several years old.... and tey end with: "I don't think that tangentkins is a good solution." - Im not really shure, if it is possible, to use tangentkins to lift off a knife if the angle of an angular-axis move exceeds - for example - 10 degrees
[03:50:29] <wicki> the kinetics - as I see them - are not able to stop the moving of X and Y, lift off Z, rotate A and put down Z again after A is rotated
[03:51:52] <wicki> so, is that question enough to get a qualified answer? ;-)
[03:52:51] <yasnak> You're doing this all as one path? Sorry, I know nothing of linuxcnc but I can guess if you had different paths you could make it work. I'm guessing the module doesn't just "know" wht you want it to do. you need to do work as well.
[03:53:30] <archivist> I would do it earlier, in gcode
[03:53:35] <yasnak> yeah
[03:53:40] <yasnak> thats what I'm saying
[03:53:55] <yasnak> Seperate paths and change your angles there, keeping the cutter direction correct
[03:56:15] <pink_vampire> yasnak: I cant imagine my life without my nails..
[03:56:24] <yasnak> Or maybe something like a wire edm setup where you have your right and left comp (g40, g41, g42) and also taper comp (g50,g51,g52) where you could make your postprocessor spit out the correct code. Again, I'm just a cnc machinist who likes talking shop. Others know more here for sure.
[03:57:43] <pink_vampire> yasnak: and yeah.. It's very complicated with metal working.
[03:58:12] <XXCoder> I dont know tangentkins
[03:59:07] <archivist> for character cutting I would hack something like ttt to add A to its output with lifts where needed
[03:59:37] <archivist> or hack dxf2gcode in a similar manner
[03:59:42] <wicki> yes, I wrote a import-filter for .hpgl-files then - it works. but its also interesting for me, to solve this problem in realtime.
[04:00:11] <archivist> I am not sure realtime is the right place
[04:00:15] <yasnak> lol
[04:00:18] <yasnak> MDI?
[04:00:32] <archivist> he means in the kins
[04:00:47] <wicki> https://forum.linuxcnc.org/forum/10-advanced-configuration/13083-4th-axis-tangent-to-path-xy?start=40
[04:02:53] <archivist> in the kins is basically too late to make good choices
[04:05:22] <wicki> it may be possible, with a lot of position-shifting, I think. but: is it possible, to pause an axis-movement in the kins?
[04:07:10] <pink_vampire> what consider as good price for unknown cold rolls steel 1.75" x 2" 5.5 feet length?
[04:08:27] <pink_vampire> or in millimeters 45 X 50 X 1700 mm
[04:09:22] <pink_vampire> someone?
[04:09:29] <pink_vampire> archivist: ?
[04:09:29] <yasnak> Are you located in the states?
[04:09:32] <pink_vampire> yes
[04:09:38] <pink_vampire> in NY
[04:10:43] <pink_vampire> yasnak: ^
[04:12:27] <yasnak> you need it to be a full 5.5' bar?
[04:12:31] <yasnak> or pieces of one
[04:13:19] <yasnak> http://www.onlinemetals.com/merchant.cfm?pid=22238&step=4&showunits=inches&id=199&top_cat=197
[04:13:27] <pink_vampire> full 5.5'
[04:13:39] <yasnak> or you could try calling someone like alro but they normally won't deal with such small qty.
[04:13:52] <pink_vampire> $170.23
[04:13:54] <pink_vampire> WOW
[04:14:12] <yasnak> w/o shipping too
[04:14:35] <yasnak> anything over 6' or 8' (can't remember) goes up in price as they need to put it on a different truck
[04:14:46] <pink_vampire> I got it for quarter of it
[04:15:23] <yasnak> yeah, i mean thats normal. you go to home depot for a screw and it'll cost the same amount i can make 1000 pcs for
[04:16:22] <maxcnc> hi
[04:17:02] <yasnak> morning
[04:17:06] <maxcnc> yasnak: there are posts out that do this correction on cutter direction angle change
[04:17:31] <maxcnc> and its quite easy on linuxccn to import the g-code thrue a python script
[04:17:31] <yasnak> oh definately. there is posts for everything ;)
[04:17:50] <maxcnc> that fills in the C move on every step
[04:18:18] <maxcnc> i use the C for the tool orientation
[04:18:19] <yasnak> i was just saying that sometimes you need to actually do the work yourself. that or make what others have done work for you. sorry.
[04:18:24] <archivist> wicki, remember you material will affect the suitable radius and lift so better off upstream
[04:18:31] <pink_vampire> I got today, about 1'X2' 3/8" aluminum sheet, some half inch brass rods, about 1' length. thick plate about 1.5" of aluminum 6" by 8", and some small brass plate 1/4" 6" by 6 " ans the big cold roll steel,
[04:18:58] <pink_vampire> everything less then 100
[04:19:15] <maxcnc> yasnak: more difficult is to find a CAM that outputs only straights on arc moves to get best performence
[04:19:49] <yasnak> maxcnc, eh. sure. it just costs more with the hsm path cam's
[04:20:20] <pink_vampire> but I don't have the model of the metals... so I don't know if it's a good deal. or f I can use it.
[04:20:23] <yasnak> HSMWorks has a free 2.5 axis cam software, I'd say thats going to be the best thing for that.
[04:20:28] <maxcnc> if you spend money on it shure but you can go for free with python already used
[04:21:14] <maxcnc> the cutter needs plain 2D
[04:21:14] <maxcnc> so no need for a 3D cam
[04:21:23] <maxcnc> as simple as it is Qcad can do the job for you
[04:21:38] <yasnak> sure. whatever works for you definately
[04:21:48] <maxcnc> i work on heekscnc as it can overrun the path
[04:21:49] <XXCoder> maxcnc: bit surpised there isnt any g02 to g1 convertor
[04:21:51] <yasnak> i just use notepad and a calculator :P
[04:21:55] <XXCoder> g02/g03
[04:21:59] <maxcnc> best to get realy cutted parts
[04:22:11] <yasnak> there is many machinist calc apps out there xxcoder
[04:22:35] <pink_vampire> bobcam it's also good option.
[04:22:38] <maxcnc> XXCoder: the cam itself outputs only g1 no circular
[04:22:40] <yasnak> bobcam sucks :P
[04:22:46] <XXCoder> yasnak: so machinist calculator can convert single g2 or g3 line to bunch of g1 moves>
[04:22:58] <pink_vampire> but it's 700$
[04:23:03] <yasnak> sure, it will break the arcs up into lines. you can tell it the spacing
[04:23:11] <pink_vampire> and hsmworks is 4K
[04:23:24] <XXCoder> there is few free options
[04:23:29] <maxcnc> like rhino 2015 can do this on the free version
[04:23:31] <yasnak> I use this alot when doing polar milling as it uses a C and then you mill too close to center the machine freaks out
[04:23:42] <pink_vampire> I don't know what to do with the material that I got.
[04:23:44] <XXCoder> some isnt very good. some is awesome on modeling but sucks on cam (freecad)
[04:23:59] <pink_vampire> I don't know how to identify them.
[04:23:59] <yasnak> pink_vampire, you need to make chips with it
[04:24:06] <yasnak> is it magnetic?
[04:24:18] <yasnak> post pictures
[04:24:26] <maxcnc> XXCoder: agree i use about 5 CAD and more then 5 CAM
[04:24:29] <XXCoder> magnetic/nonmagnetic do cull out many possibilities
[04:24:40] <pink_vampire> I know that the brass is brass, and the bar id cold rolled..
[04:24:44] <maxcnc> plasma is sheetcam awaysom
[04:24:58] <maxcnc> on Foam 3D is Rhino best
[04:25:04] <pink_vampire> and the aluminum is aluminum
[04:25:12] <maxcnc> Papercutting no way around Heeks
[04:25:36] <pink_vampire> but I don't know what is the exact number of the metals...
[04:25:48] <pink_vampire> like 6061..
[04:25:51] <maxcnc> and Deskproto for 4Axis miling angular
[04:25:57] <pink_vampire> you know what I mean?
[04:26:04] <yasnak> vampire, why would it matter?
[04:26:15] <yasnak> you don't know the heat/lot number. not like you need material traceability
[04:26:27] <maxcnc> modifiying models with blender a rewal quick cool thing to get a watertight modell
[04:26:33] <wicki> archivist: I can tell the kins the radius by halcmd or tool parameter. my basic question is: is it possible to pause an already started axis-move inside the kins for an while an continue later
[04:26:50] <yasnak> slide hold it?
[04:27:01] <pink_vampire> but it will work on my machine?
[04:27:22] <yasnak> lol. i mean beyond the actual material...make a cut and find out
[04:27:31] <maxcnc> wicki: the move is stope imidiate not antr the end
[04:27:55] <maxcnc> and continued from there not from the start
[04:28:16] <pink_vampire> for example. the hot rolled steel the I got from home depot was very complicated to machine.
[04:28:28] <yasnak> why?
[04:28:40] <pink_vampire> It get hard
[04:28:48] <yasnak> you're cutting it too slow then :P
[04:28:49] <maxcnc> homedepoo steel is not defind
[04:28:55] <yasnak> less rpm, more feed
[04:28:56] <wicki> maxcnc: that would be OK - but how to stop the movement?
[04:29:00] <pink_vampire> I had to move fast and take small cut.
[04:29:03] <maxcnc> it might get triggy to repeet one week later
[04:29:03] <XXCoder> pink_vampire: dont expose yourself to any smoke when cutting brass. you might become allegric to brass. I know one machinist that got that at work
[04:29:04] <yasnak> exactly
[04:29:17] <maxcnc> wicki: just press pause
[04:29:24] <XXCoder> he had to leave to home and recover when someone runs brass rods
[04:29:33] <maxcnc> or with a simple button on halui command
[04:29:58] <yasnak> xxcoder, we cut beryllium dry :P
[04:30:00] <wicki> maxcnc: not by keyboard.... inside the xxxkins.c-prog
[04:30:01] <pink_vampire> how you get smoke from brass??
[04:30:15] <yasnak> and 17-4. Chromium
[04:30:30] <XXCoder> dunno maybe not smoke? guys said can easily smell it, I assumed it was smoking
[04:30:33] <maxcnc> wicki: why so deep if the gui takes action on this
[04:30:36] <XXCoder> I cant smell so yea
[04:31:35] <yasnak> i've cut brass, 14-7 and beryllium dry for years. just recently the later two have been heavily restricted and proven to cause cancer. you will be fine with brass.
[04:31:57] <pink_vampire> to use flooding?
[04:32:04] <wicki> maxcnc: as I explained: pause X and Y, lift Z, turn knife, lower knife and go on
[04:32:29] <maxcnc> wicki: normel task wil last about 0.02s so about 50times per sec gui and realtime is synced and will do what you want
[04:32:45] <pink_vampire> beryllium is toxic!
[04:32:54] <pink_vampire> the dust
[04:32:58] <yasnak> yes
[04:33:02] <XXCoder> everything is toxic - depends on dose
[04:33:06] <yasnak> yes
[04:33:12] <maxcnc> wicki: oh i see you might turn the knove outside the part
[04:33:24] <yasnak> it all eventually goes somewhere.
[04:33:33] <maxcnc> so best to do this by a simple mcode
[04:33:34] <pink_vampire> but beryllium is transparent to X-ray
[04:33:58] <maxcnc> the mcode also can calculate the angle of the turn
[04:34:07] <yasnak> maxcnc, why not just run the cutter to beginning of arc. put in m1. stop machine and turn cutter. restart program at whatever point and keep going?
[04:34:39] <yasnak> *stop cutter, lift z, then m1.
[04:35:46] <maxcnc> just put M111 beond every gcode after fiorst down
[04:36:34] <pink_vampire> there is something that I should to avoid when I machining graphite?
[04:36:43] <yasnak> the dust lol
[04:36:52] <yasnak> otherwise its fairly easy to machine.
[04:37:03] <pink_vampire> yasnak: to use flooding on it?
[04:37:04] <maxcnc> pin sharp edges on fuöll cutr
[04:37:15] <XXCoder> pink_vampire: just curious why machine graphite
[04:37:22] <maxcnc> pink_vampire: it will break out the part
[04:37:26] <pink_vampire> secret.
[04:37:37] <XXCoder> ah that giant pencil heh
[04:37:42] <pink_vampire> no..
[04:37:44] <maxcnc> and work slow from top to down in full shape
[04:37:48] <yasnak> if you use routers it will machine ok
[04:37:56] <pink_vampire> I'm working on sink EDM machine.
[04:37:56] <maxcnc> best to stay within 5mm depth
[04:38:12] <yasnak> what kind of sinker?
[04:38:15] <pink_vampire> something small
[04:38:18] <yasnak> i've got a fanuc
[04:38:28] <maxcnc> pink_vampire: there is special graphit for this
[04:38:47] <pink_vampire> instead of using broching bard and stuff like that..
[04:38:49] <maxcnc> we got a agii100D
[04:38:54] <maxcnc> agie
[04:38:56] <pink_vampire> also to drill ball bearings.
[04:38:59] <Sync_> pink_vampire: you can't flood when machining edm electrodes
[04:39:43] <wicki> my idea to do in in the kins: save the target-pos. of X and Y, set the target pos to akt.-pos (XY-movement will stop), set the A/Z-targets, wait until ready, restore the target XY-pos
[04:40:09] <pink_vampire> Sync_: what about alcohol mist
[04:40:15] <yasnak> lol
[04:40:28] <yasnak> man you guys make my head hurt
[04:40:36] <maxcnc> wicki: why so complicated if it workes with nothing to do just change the post
[04:41:02] <pink_vampire> so there is no why to prevent the dust?
[04:41:03] <maxcnc> wicki: lots of us use this kind of work
[04:41:17] <maxcnc> and it workes fine
[04:41:17] <wicki> maxcnc: because I want to know if it works ;-)
[04:41:22] <maxcnc> even on double heads UVW
[04:41:36] <yasnak> wicki, test it by running it above the part first. does it work? cool. set it down and cut
[04:41:37] <pink_vampire> maybe machine it under distilled water bath?
[04:41:52] <Sync_> you can't put moisture in the electrodes
[04:42:15] <pink_vampire> Sync_: why?
[04:42:18] <yasnak> pink: use a shop vac. done
[04:42:36] <Sync_> because they will explode when you use them
[04:42:39] <XXCoder> probably just wear a good paracles quality mask
[04:42:49] <XXCoder> hospital grade isnt enough
[04:43:31] <pink_vampire> and I need high feed rate and small cut? or the opposite?
[04:44:00] <yasnak> On something small?
[04:44:19] <pink_vampire> on block of graphite
[04:44:49] <yasnak> Does your machine run fast enough and smooth enough? I'd go as fast as you think it can accurately go
[04:45:06] <pink_vampire> max 5M / min
[04:45:22] <yasnak> just take a cut and see what happens. honestly there is no rule of thump
[04:45:29] <pink_vampire> but normally I work 1.5M/min max
[04:45:30] <yasnak> *thumb. this is where you need to learn.
[04:46:05] <XXCoder> 1.5 meters a min?
[04:46:09] <pink_vampire> yes.
[04:46:23] <XXCoder> think thats pretty lot faster than my machines 20 ipm
[04:46:28] <pink_vampire> it's fast enough?
[04:46:33] <maxcnc> oh is see a sample here in graphite let me make a quick picture
[04:47:12] <pink_vampire> maxcnc: thanks.
[04:47:14] <XXCoder> in/s actually
[04:47:28] <pink_vampire> XXCoder: what do you mean?
[04:47:56] <maxcnc> its a 0.2mm 5mm depth
[04:48:30] <maxcnc> http://heimwerkermarkt-tretter.de/gr_2016.jpg
[04:48:40] <pink_vampire> 0.2mm of? and 5mm depth of cut?
[04:48:50] <maxcnc> oh its only 3mm depth
[04:48:53] <XXCoder> maxcnc: thyats very detailed graphite
[04:49:01] <XXCoder> what was it used for, if not secret?
[04:49:13] <maxcnc> Lunch
[04:49:23] <maxcnc> till later
[04:49:28] <pink_vampire> maxcnc: look very nice part!
[04:51:00] <wicki> ok - an know to something completly different: where to find gcode-files for standard subd-connectors?
[04:51:12] <pink_vampire> there is special tools for graphite of regular HSS will work fine
[04:51:18] <pink_vampire> ?
[04:51:27] <XXCoder> max left so dunno
[04:51:35] <XXCoder> wild guess, regular would be fine
[04:51:39] <pink_vampire> :(
[04:51:48] <pink_vampire> why he left?
[04:51:48] <XXCoder> HSS seem to work on everything not harder than alum
[04:51:51] <XXCoder> lunch
[04:51:54] <XXCoder> he said so
[04:52:15] <Deejay> somewhat early for lunch. its 11:26 am here
[04:52:45] <pink_vampire> but graphite is soft and brittle..
[04:53:07] <XXCoder> pink_vampire: just keep cutting force low I'd say?
[04:53:28] <XXCoder> graphite isnt very expensive from what I understand, so could test cutting speeds
[04:53:34] <pink_vampire> no!
[04:53:49] <XXCoder> its expensive?
[04:54:16] <pink_vampire> it's one of the most common things on earth...
[04:54:40] <XXCoder> yeah carbon
[04:54:47] <pink_vampire> http://www.ebay.com/itm/High-Purity-99-9-Graphite-Ingot-Block-Sheet-50mm-50mm-20mm-/271819149440?hash=item3f49af1080:g:N2QAAOSwVFlUHKFb
[04:55:16] <XXCoder> I want to try to cut nylon infused with glass powder and steel powder
[04:55:27] <XXCoder> thats definitely interesting material, cut em at work.
[04:55:36] <pink_vampire> http://www.ebay.com/itm/1x-High-Purity-99-9-Graphite-Ingot-Blank-Block-Sheet-Fine-Grain-50x50x20mm-/321998625631?hash=item4af89d1b5f:g:iIMAAOSwoydWsyMu
[04:55:37] <XXCoder> eats tools though lol
[04:55:45] <pink_vampire> cheaper..
[04:55:52] <XXCoder> indeed. interesting
[04:56:36] <yasnak> http://www.semcocarbon.com/semco-carbon-blog/five-keys-to-success-when-machining-graphite
[04:56:43] <yasnak> machine it like you would plastic
[04:57:18] <pink_vampire> I want to try to use mechanical pencil lead as electrode and drill very small holes in hard metals
[04:57:21] <XXCoder> interesting. graphite "chips" + coolant = tool eater
[04:57:38] <yasnak> yeah, its like iron
[04:57:46] <yasnak> iron eats the crap out of carbide
[04:58:20] <pink_vampire> yasnak: but graphite is one of the best lubricant know to man?..
[04:58:35] <XXCoder> yasnak: you'd be surpised on how fast nylon with glass powder eats tools too. (we use nylon with glass powder for one part, and nylon with glass powder and steel powder for another)
[04:58:38] <yasnak> pink_vampire: no, that would be KY :P
[04:58:53] <XXCoder> alien drools is KY
[04:58:59] <pink_vampire> ok..
[04:59:08] <pink_vampire> "day lubricant"
[04:59:13] <XXCoder> if theres clear "gross" stuff in movies its almost always KY
[04:59:40] <pink_vampire> ho do you know that??
[04:59:48] <pink_vampire> how*
[05:00:05] <yasnak> XXCoder: yeah, I can assume it would be fun to machine. I have milled/turned nitinol. it is also very very hard stuff and a beast of its own
[05:00:09] <pink_vampire> dry*
[05:00:14] <XXCoder> cracked article, interview with one of movie effects expert
[05:00:48] <XXCoder> yasnak: yeah I had thin strip left afetr cutting. I had to bend it doube over 120 times for it to break
[05:00:54] <XXCoder> though
[05:00:57] <XXCoder> tough*
[05:01:30] <pink_vampire> I know nitinol is very sensitive to temperature ..
[05:01:34] <XXCoder> "Second, the starting raw graphite material should be dry before machining. If your raw material stock has been stored outside or been exposed to water it should be baked to drive out any excessive moisture. The water and dust will make an abrasive slurry, which will dramatically reduce your tool life."
[05:01:56] <pink_vampire> do you use coolant on the nitinol?
[05:02:03] <XXCoder> "hirdly, it is very important to have an adequate ventilation system to contain and vent the graphite dust and chips produced during the machining operations. Graphite dust is electrically conductive and will find its way into every crack or opening in a machine enclosure."
[05:02:06] <yasnak> i use high pressure oil
[05:02:11] <yasnak> carbide tooling
[05:02:26] <XXCoder> ouch my machine would die. graphite is VERY conductive
[05:02:27] <yasnak> perfected feedrates, any variation goes from running good to taking a massive shit
[05:02:33] <XXCoder> seal your computer against it
[05:03:11] <pink_vampire> I have and idea
[05:03:14] <yasnak> you don't put filters on your computers if they're near the machning area? :P
[05:03:28] <XXCoder> graphite dust is VERY fine. you have to figure how to keep computer cool and zero exposure
[05:03:37] <XXCoder> yasnak: I dont have complete setup yet'
[05:03:41] <yasnak> ah
[05:03:44] <XXCoder> its complete in way it runs
[05:03:50] <pink_vampire> the computer with filters.
[05:03:53] <XXCoder> but yeah still need to build some case
[05:04:15] <XXCoder> machines at work has this weird VERY fluffy white thingy that covers all inlets
[05:04:19] <pink_vampire> the new panel going to be seal
[05:04:26] <XXCoder> all slightly dirty due to all that dust over time
[05:04:45] <pink_vampire> I'm cleaning all the time.
[05:04:46] <XXCoder> I guess that filter has HUGE surface area so air can easily go in but dust cant
[05:04:51] <pink_vampire> can't see mess.
[05:05:04] <pink_vampire> drive me crazy!!
[05:05:48] <XXCoder> 4: keep tools VERY sharp while cutting graphite
[05:06:14] <pink_vampire> wowww now I see the video
[05:06:17] <XXCoder> and finally 5) climb cut only as other way causes rougher finisgh
[05:07:01] <pink_vampire> this is a dust munster
[05:07:02] <XXCoder> yasnak: any idea on designing a case?
[05:07:15] <XXCoder> pink_vampire: yeah I'd wear a fine particle mask.
[05:07:21] <XXCoder> not cheap hopsital type
[05:07:38] <pink_vampire> 3M 6700 mask
[05:07:44] <XXCoder> dang thats tons of fine electrics killer dust
[05:08:11] <XXCoder> video suggests using some form of derbis remover. I guess blower or something
[05:08:37] <Sync_> why don't you use something like WCu that does not make such a mess?
[05:08:57] <pink_vampire> Sync_: WCu ?
[05:09:14] <Sync_> yes
[05:09:34] <pink_vampire> what is WCu ?
[05:09:42] <yasnak> Coppper tungsten right?
[05:10:04] <yasnak> I don't do electronics and the likes :P
[05:10:15] <XXCoder> pink_vampire: if youre milling carbide to make tiny rods to drill using electricity, why not just buy pencil leads?
[05:10:21] <XXCoder> those all are graphite.
[05:10:34] <XXCoder> its called lead because it used to be actual lead
[05:10:59] <pink_vampire> I have 1/4" rod.
[05:11:24] <pink_vampire> and I want to make 1/16" by 1/8" rectangular,
[05:11:52] <pink_vampire> about 1/4" deep
[05:12:06] <pink_vampire> not something crazy..
[05:18:21] <yasnak> well guys, its been fun. machine is running good and has enough bar to run for a day. time for some sleep! https://www.youtube.com/watch?v=WMHGSvtgNaU
[05:19:18] <XXCoder> night
[05:19:45] <XXCoder> ouch
[05:19:48] <XXCoder> that video hurts
[05:20:36] <pink_vampire> yasnak: you film it?
[05:21:47] <pink_vampire> what is those tiny parts?
[05:40:17] <Deejay> set screws?
[05:41:57] <pink_vampire> for set screws you don't need this cnc machine
[05:42:09] <Deejay> oh, was just a (bad) guess
[05:42:11] <pink_vampire> you just order them.
[06:14:48] <__rob2> anyone got advice for a precision bore in small timing pulleys. clamping in the 3 jaw lathe chuck results in stiff spots
[06:15:01] <__rob2> was thinking of doing it on the mill instead
[06:15:08] <__rob2> they are all pre centred
[06:15:28] <__rob2> my worry is a bore that is true at the start, but not on the other side
[06:15:52] <__rob2> same problem with mill or lathe
[06:16:32] <__rob2> they're T2.5 ones, so quite small
[06:17:12] <Sync_> depends on the quality of the pulley in the first place
[06:18:15] <__rob2> biggest problem is I dont have enough on the pulley to clamp it, and run a dial indicator to check runout
[06:18:27] <__rob2> can't really run the indicator on the actual pulley teeth
[06:18:37] <Sync_> you can
[06:18:53] <__rob2> ohh, thought that would be bad for the indicator
[06:19:09] <__rob2> so you normally would check runout along the length?
[06:19:19] <__rob2> to check for tangential misalignment on the pulley
[06:19:41] <__rob2> cos the problems I have don't seem to just be runout
[06:19:50] <__rob2> but its actually gripped at an angle in the chuck
[06:19:57] <Sync_> you don't turn the lathe on obviously
[06:20:16] <__rob2> so one end has more runout then the gripped end
[06:20:22] <Sync_> you should tap it before final tightening
[06:20:31] <__rob2> if that makes sense
[06:21:28] <__rob2> http://snag.gy/dn6Ua.jpg
[06:21:36] <__rob2> obviously not that severe, but that gives the idea
[06:53:22] <pink_vampire> __rob2: you still here?
[06:55:44] <pink_vampire> If you have run-out the best way to make the setup is with 4 independent jaw chuck
[06:56:11] <pink_vampire> __rob2: ^
[07:01:03] <pink_vampire> hi new-cnc
[07:03:56] <__rob2> yea
[07:04:17] <__rob2> just bought one for my proxxon
[07:04:20] <__rob2> fingers crossed
[07:04:58] <pink_vampire> __rob2: what model of proxxon?
[07:07:34] <__rob2> pd230
[07:08:32] <__rob2> not sure if its compatible with other chucks or i'd get something where I can make softjaws
[07:08:39] <pink_vampire> look cute
[07:09:14] <pink_vampire> so you don't have 4 jaw chuck?
[07:09:45] <maxcnc> hi back from launch
[07:09:48] <__rob2> nope, not at the moment
[07:09:50] <new-cnc> hi
[07:09:51] <__rob2> just ordered one
[07:10:20] <__rob2> most stuff I just do in 1 pass so its ok, but when you want to bore an existing part, never had any luck
[07:10:23] <__rob2> or flip a part
[07:10:44] <maxcnc> hi new-cnc first in here or just nick change
[07:11:05] <maxcnc> where in the world are you Asia Europ US
[07:12:22] <pink_vampire> __rob2: ihave an idea for you.
[07:12:42] <pink_vampire> you have a milling machine?
[07:13:00] <pink_vampire> I have *
[07:13:10] <new-cnc> lol, just setting up some hard drives for my Mesa Store
[07:13:16] <maxcnc> rob is it the 230e or standard
[07:13:48] <maxcnc> new-cnc: = psw
[07:14:04] <pink_vampire> maxcnc: I want to ask you something.
[07:14:07] <__rob2> 250 is the new I think
[07:14:09] <new-cnc> new-cnc: = JT
[07:14:16] <__rob2> its just the 230 I think
[07:14:35] <__rob2> not sure what the /e version has that it doesn't
[07:14:53] <new-cnc> http://mesaus.com/index.php?route=product/category&path=68
[07:14:56] <__rob2> pink_vampire, yes I do
[07:15:00] <maxcnc> the flansch for the PF
[07:15:01] <pink_vampire> maxcnc: are you using special tools to cut the graphite, ar any HSS tool will work just fine?
[07:15:01] <__rob2> whats your idea ?
[07:15:19] <maxcnc> VHM
[07:16:56] <maxcnc> pink the Hss will rubber shortly
[07:16:56] <maxcnc> and then the finish path will burst of your pah
[07:16:56] <maxcnc> part
[07:17:05] <pink_vampire> if you clamp the part tp the machine table, and use probe with large ball you can find the center of the pulley, and machine the bore.
[07:17:16] <maxcnc> pink_vampire: the most to warry about if tiny things needed is the graphite itself
[07:17:20] <pink_vampire> tp = to
[07:17:44] <maxcnc> pink_vampire: the parts are fixed oon to the EDM stuff holder
[07:17:55] <maxcnc> and mashined in this
[07:18:19] <maxcnc> no tool moves of this till the work is finished
[07:18:34] <pink_vampire> maxcnc: but what type of end-mills are you using for cutting the graphite..
[07:18:35] <maxcnc> about 1k holders in rotation
[07:19:02] <maxcnc> depends on shape
[07:19:16] <maxcnc> fishtail is best for rouphing
[07:19:53] <maxcnc> and then 2mm ball with 8mm edge height on long holders
[07:20:14] <maxcnc> max i can go is 50mm depth
[07:20:19] <maxcnc> at 0.2mm wall thickness
[07:20:31] <maxcnc> let me look i got in the house a sample
[07:20:32] <pink_vampire> but it's HSS end mills?, or you have to use carbide / diamond?
[07:20:44] <pink_vampire> all my tools are HSS
[07:20:48] <maxcnc> VHM most
[07:20:59] <maxcnc> bo codet
[07:21:00] <pink_vampire> what is VHM?
[07:21:11] <maxcnc> Hard methell
[07:22:15] <pink_vampire> lol methell
[07:22:31] <maxcnc> methal
[07:24:21] <pink_vampire> look very nice cutters
[07:24:33] <pink_vampire> also very expensive
[07:25:56] <pink_vampire> http://www.amazon.com/Micro-100-VHM-500-5K-Variable-Diameter/dp/B00T4GE0VG
[07:26:30] <pink_vampire> O_o
[07:27:44] <pink_vampire> maxcnc: I want to cut a rectangular 1/8" by 1/16" about 1/4 deep from 1/4" rod
[07:27:58] <pink_vampire> and use it to cut keyways.
[07:28:22] <pink_vampire> maxcnc: do you think I can do it with HSS?
[07:28:35] <pink_vampire> or to get VHM tool?
[07:28:40] <maxcnc> yes you can
[07:29:05] <maxcnc> what max depth on the less thickness you need
[07:29:36] <maxcnc> is there sharp edges requirered or all ar >R0.3
[07:29:37] <pink_vampire> the gear is 3/16" thick..
[07:29:58] <maxcnc> metric mmm
[07:30:07] <pink_vampire> ok..
[07:30:14] <maxcnc> Why gear EDM
[07:30:43] <__rob2> need to thread some silver steel on that proxxon, hoping it will be ok for that
[07:30:46] <maxcnc> there are 3D methal printers
[07:31:03] <__rob2> I cut the rod with a grinder, then just dumped it in water to cool it off quick
[07:31:09] <__rob2> is that likely enough to harden at all ?
[07:31:11] <maxcnc> __rob2: good luck on that
[07:31:12] <pink_vampire> 4.74 mm think is the gear
[07:31:26] <__rob2> max, you think its too hard?
[07:31:32] <__rob2> its unharded stuff
[07:31:44] <maxcnc> Chrom Vanadium its shure not made for
[07:31:56] <pink_vampire> so the electrode need to be a bit long.. so about 6mm..
[07:33:03] <maxcnc> NP
[07:33:13] <pink_vampire> NP?
[07:33:30] <pink_vampire> I want to just cut the keyway.
[07:33:31] <maxcnc> is it withworth 1/8 or UNF
[07:33:49] <maxcnc> 55deg
[07:34:18] <pink_vampire> what do you mean?
[07:34:31] <__rob2> aparrently this rod is 27 HRC before hardening
[07:34:43] <pink_vampire> to make the electrode like a pyramid?
[07:35:25] <maxcnc> i think my technical english is not that good to get over your problem
[07:35:54] <maxcnc> __rob2: it will be 62 after
[07:36:10] <__rob2> yea, but i've not hardened it
[07:36:12] <__rob2> so thread it
[07:36:13] <maxcnc> you can get 65 out of some good
[07:36:15] <__rob2> then harden, right
[07:36:28] <maxcnc> yes of course
[07:36:51] <pink_vampire> I'm a beginner.. this is a place for hobby machining..
[07:37:15] <maxcnc> agree on that the parts are standard so why not byingit
[07:37:22] <pink_vampire> http://i.imgur.com/xJxNO0S.png
[07:37:25] <maxcnc> and resell
[07:37:28] <Sync_> why don't you just broach the keyway?
[07:37:29] <pink_vampire> this is the gear
[07:37:40] <Sync_> or mill it
[07:37:59] <pink_vampire> Sync_: how I can mill it?
[07:38:41] <maxcnc> just mill it
[07:38:48] <pink_vampire> how.
[07:39:07] <pink_vampire> I can't cut 90 deg corners
[07:39:08] <maxcnc> with a less radius end mill then the curves
[07:39:15] <maxcnc> its a simple path
[07:39:36] <pink_vampire> but the smallest endmill that I have is 1/16"
[07:39:37] <Sync_> you don't need square corners
[07:39:44] <maxcnc> can you upload a topview DXF
[07:39:52] <pink_vampire> and the slot is 1/16"
[07:40:02] <malcom2073_> pink_vampire: Buy a die filer :-D
[07:40:08] <Sync_> you can also just file it
[07:40:10] <pink_vampire> http://i.imgur.com/XzaWvsF.png
[07:40:31] <pink_vampire> this is the electrode the I want to make
[07:40:42] <maxcnc> there are cases on ebay at 20USD to make this rods
[07:41:16] <pink_vampire> I have 1/4" graphite rode here.
[07:41:24] <pink_vampire> rod*
[07:41:31] <Sync_> in the time spent wondering you could have made the keyway
[07:41:38] <Sync_> you don't need a sinker edm for it
[07:41:42] <Sync_> just mill the slot
[07:41:45] <Sync_> and file the corners
[07:42:28] <pink_vampire> and I also need to drill hole in ball bearing.
[07:42:44] <pink_vampire> I want an EDM.
[07:42:49] <pink_vampire> it's cute.
[07:43:14] <maxcnc> http://www.paulimot.de/raeumnadeln-sets/707/raeumnadel-set-fuer-2-3-und-4-mm-keilnuten
[07:43:36] <maxcnc> full set under 100
[07:43:53] <pink_vampire> maxcnc: but than I need a press and stuff like that.
[07:44:30] <Sync_> you have a mill
[07:44:33] <Sync_> you can use the quill
[07:44:41] <maxcnc> this tiny things can go thrue with out a press
[07:44:41] <maxcnc> it is at 0.3mm per turn
[07:45:07] <pink_vampire> maybe you right.
[07:45:17] <pink_vampire> but there is anther thing that I'm not sure about the sink EDM
[07:45:27] <maxcnc> at 6mm depth you can go miling at 0.5mm cutter so you got a 0.25R
[07:45:39] <maxcnc> and the tool got a 0.2
[07:46:30] <maxcnc> just takes little more time
[07:46:33] <pink_vampire> I need to make a loop on the controller to maintain the spark gap. but I'm not sure what I need to monitor for it.
[07:46:57] <pink_vampire> maxcnc: I think I will file it.
[07:47:03] <maxcnc> the tools are within a vice distance to get pulled in
[07:47:24] <maxcnc> up to ypou
[07:47:42] <Sync_> some sinkers will just vibrate the electrode
[07:47:48] <maxcnc> more ways to solve this
[07:47:48] <maxcnc> EDM ist the most cost
[07:47:49] <Sync_> advance until they spark out and then retract
[07:47:52] <pink_vampire> but I'm still want to finish my EDM sinker.
[07:48:22] <maxcnc> this is also a standard one its CU elektrodes
[07:48:25] <pink_vampire> I don't what the vibrate one.
[07:48:31] <maxcnc> no need for graphite
[07:48:46] <Sync_> then read up on control theory
[07:49:06] <pink_vampire> I got very accurate IKO rail
[07:49:22] <maxcnc> ok nice talk folk bye getting some time without cnc
[07:49:26] <pink_vampire> about 1" travel
[07:50:09] <pink_vampire> maxcnc: nice talking with you
[07:50:13] <pink_vampire> gone :(
[07:51:58] <pink_vampire> Sync_: do you think that monitoring the current will be enough to maintain the spark without touching?
[07:55:21] <anomynous> buy a function generator and amplifier? :D
[07:55:56] <pink_vampire> why a function generator?
[07:56:01] <pink_vampire> it's not DC?
[07:56:13] <anomynous> because it sounds high-tech. Why not?
[07:56:42] <pink_vampire> I have 50 years old function generator,,,
[07:56:56] <anomynous> you can be quiet about it and pimp it
[07:56:56] <pink_vampire> not high tech at all.
[07:57:40] <pink_vampire> anomynous: I need yo make pulsing DC for the EDM??
[07:58:08] <anomynous> i realized. I didnt know it has to be dc :) And i dont know how
[07:58:23] <pink_vampire> I think it's just DC and push and pull
[07:58:33] <anomynous> but dont function generotrs often let you like shift the sine wave up or so, above the middle line?
[07:59:31] <pink_vampire> my generator just make waves in several shapes
[07:59:31] <Sync_> no pink_vampire
[07:59:59] <Sync_> you need to maintain arc voltage
[08:00:01] <Sync_> not current
[08:00:03] <anomynous> buy some fancy tig and use that? :D
[08:00:07] <anomynous> they have that kind of settings
[08:00:56] <Sync_> tig is current mode
[08:01:01] <pink_vampire> how I measure it? volt meter between the electrode and the part?
[08:01:11] <anomynous> so add a bigass resistor
[08:01:36] <pink_vampire> way resistor?
[08:01:43] <anomynous> because it sounds high tech
[08:01:48] <Sync_> yes, you measure the voltage between the electode and the part
[08:02:03] <Sync_> but you need quite a high voltage to initiate the arc without touching
[08:02:12] <pink_vampire> the resistor is to prevent shorting of the power supply?
[08:02:16] <Sync_> that why older units vibrated
[08:02:45] <pink_vampire> about 48V will work?
[08:03:09] <anomynous> pink_vampire, almost. Limit the current your tig-to-edm conversion produces and just maintain arc voltage like some smart guy said. But i dont know if thats nonsense. But it sounds really cool
[08:04:29] <pink_vampire> anomynous: I'm a girl that like machinery... I think I'm cool anyway..
[08:04:30] <Sync_> it is nonsense
[08:04:40] <anomynous> pink_vampire, could be.
[08:04:48] <anomynous> though i meant the machine would be cool
[08:04:49] <anomynous> think about it
[08:04:54] <anomynous> tig-to-edm conversion
[08:04:55] <anomynous> :D
[08:06:00] <pink_vampire> I want to learn how to weld.
[08:06:08] <anomynous> point and press the button
[08:06:11] <anomynous> has worked for me.
[08:06:18] <anomynous> but they never let me weld those paper machine parts
[08:06:20] <anomynous> i wonder why
[08:06:51] <pink_vampire> I think tig is very nice and versatile.
[08:07:07] <anomynous> ive tried it with little success
[08:07:11] <anomynous> maybe i'll learn
[08:07:46] <pink_vampire> mig I know it's much more easy
[08:14:12] <archivist> best to get training to weld
[08:17:07] <pink_vampire> where?
[08:18:45] <archivist> a local college
[08:19:28] <archivist> I cheated, got a job as a trainee welder
[08:19:29] <_methods> welders will do anything for beer
[08:19:37] <_methods> especially a girl with beer
[08:19:49] <pink_vampire> I hate beer.
[08:19:55] <_methods> welders don't
[08:20:07] <pink_vampire> raspberry tea for me.
[08:20:32] <_methods> don't think that will get you very far towards free welding lessons
[08:20:38] <pink_vampire> I need to like beer to become a good welder?
[08:20:55] <_methods> no, you need to give welders beer to get free lessons
[08:21:37] <archivist> lots of practice welds
[08:22:11] <witnit> with the right beer anyone can weld
[08:22:18] <_methods> hahah
[08:22:23] <archivist> https://www.youtube.com/watch?v=ojFZ__4t7ck
[08:22:31] <pink_vampire> what about brazing?
[08:22:44] <_methods> speaking of welding i need to weld up my argon cart
[08:23:03] <_methods> i just don't want to piss off the neighbors grinding at 9am
[08:23:36] <_methods> guess i'll go get some breakfast and come back and start making some sparks
[08:24:35] <pink_vampire> _methods: I'm all about make stuff quite.
[08:24:53] <_methods> kinda hard to make grinding quiet
[08:25:08] <_methods> everything is quiet when i have my earplugs in lol
[08:25:17] <_methods> but not so much for the neighbors
[08:25:57] <pink_vampire> maybe other method..
[08:27:25] <jthornton-> I like quiet too http://gnipsel.com/cannon/cannon.xhtml
[08:28:50] <pink_vampire> jthornton-: WTF!!
[08:30:11] <_methods> hahah yeah there's nothing in the HOA covenants about CANONS
[08:31:12] <_methods> did you build 2 canons?
[08:31:24] <jthornton-> yes
[08:31:52] <_methods> was that like a canon kit or something?
[08:32:03] <pink_vampire> I have to sleep
[08:32:10] <pink_vampire> and read
[08:32:17] <jthornton> no, we bought the barrels from one place and a pile of wood and the wheels
[08:32:18] <pink_vampire> in same time
[08:32:31] <_methods> you have a local canon supplier lol
[08:32:41] <pink_vampire> LOL
[08:32:56] <jthornton> about an hour away is the cannon shop
[08:33:13] <pink_vampire> where do you live?
[08:33:29] <pink_vampire> 16 century?
[08:33:37] <jthornton> swamp east Missouri
[08:34:13] <_methods> hahah the canon store
[08:34:29] <_methods> "hey baby i'm running down to the canon store, be back in a bit"
[08:34:34] <jthornton> you like the elevator I made?
[08:34:37] <pink_vampire> LOL
[08:34:57] <_methods> yeah
[08:35:02] <_methods> i like the rondelles
[08:35:17] <jthornton> http://www.dixiegunworks.com/default.php?osCsid=r9nl4ig417e1atmjmqnj1aure7
[08:35:21] <pink_vampire> what is the most sophisticated canon in the store?
[08:35:35] <jthornton> the gatlin gun
[08:35:59] <pink_vampire> totally 16 century!
[08:36:52] <pink_vampire> you have to dry the new things with the GPS..
[08:37:26] <pink_vampire> longer distance and much more accurate.
[08:37:31] <pink_vampire> try*
[08:40:28] <pink_vampire> I"m going to sleep
[08:40:58] <pink_vampire> good night / day to all of you.
[09:07:46] <tjtr33> pink_vampire, the ignition voltage can be 100V (common value) but only needs milliamps (10-100 common values)
[09:08:39] <tjtr33> the lower voltage cutting power can be anything above 35 volts ( has to be > discharge voltage which is 28-32V for gr/st )
[09:10:20] <tjtr33> so the 'guts' dc supply is say 5 to 150Amps at 80-115Vdc ( common values, tho lower Open Voltage works fine with a 'tickler' voltage to begin the spark)
[09:11:20] <tjtr33> the ignition voltage is related to the 'dielectric breakdown strength' of the medium ( oil or water or mist or even air)
[09:11:43] <tjtr33> and there aint no current in that spec, obly volatge and distance
[09:12:13] <tjtr33> meaning you can spark with microamps if you are close enuf and have some voltage
[09:12:54] <tjtr33> AND it means you dont get any more spark with more current ( spark being the beginning of the discharge, not the metal melting part )
[09:13:16] <tjtr33> edm rule 1 ) sparks jump and sparks hurt ;-)
[09:14:38] <tjtr33> 555 your signoff came into the buffer after i read the logs
[09:17:16] <tjtr33> oh well while im talking to ghosts, look at the tiny cnc 'piccolo' for a micro edm machine base ( but use real steel rack and pinions... wood gears are cute but crap precision )
[09:17:45] <tjtr33> and its goodnight from him
[09:17:56] <tjtr33> and goodnight from me ( 2ronnies)
[09:22:23] <enleth> do you have any experience with CO2 laser tube degradation while in storage? I've seen some reports stating that they deteriorate even when not in use and it's not caused by gas/vacuum leakage. Trying to figure out if keeping a spare tube in stock makes sense in the long run
[09:28:25] <Sync_> usually it does not
[09:36:13] <enleth> apparently the internets claim that ions migrate from the electrodes and clog up the mirrors, essentially in a very slow vacuum metal deposition process
[09:38:35] <enleth> if that's the case, it would indeed make little sense to keep a spare - when it's finally needed, it's probably going to heat up at the mirror end and crack soon anyway
[09:39:12] <Sync_> well, I have no idea if that is true, but argon lasers tend to get harder to start due to slight outgassing in them when they are not running
[09:42:29] <enleth> interestingly, some case studies at Sam's Laser FAQ suggest that it's possible to build a useful CO2 laser tube with almost no glass at all
[09:46:45] <enleth> although that comest at a cost of having to maintain the low pressure and replace filler gas mix
[10:00:58] <gregcnc> ??? https://youtu.be/kPNQI-_AUIA
[10:01:10] <zeeshan|2> lol
[10:02:54] <malcom2073_> Lol, that's almost as good as the CNC cheese whiz squeezer
[10:13:04] <_methods> wow someone finally found a use for mach3
[10:16:44] <archivist> I use it for comedy
[10:17:57] <_methods> and BROWNIES
[10:17:57] <zeeshan|2> i use it to prank people
[10:32:50] <zeeshan|2> when i see linuxcnc
[10:32:54] <zeeshan|2> i imagine this picture
[10:32:58] <zeeshan|2> http://www.polar-quest.com/wp-content/uploads/2013/08/Svalbard-6.jpg
[10:33:30] <zeeshan|2> linuxcnc is the polarbear, the carcass is mach 3 :)
[10:33:47] <zeeshan|2> http://www.toehold.in/phototours/images/svalbard2.jpg
[10:33:50] <zeeshan|2> and this is tormach
[10:35:59] <anomynous> mm
[11:02:21] <__rob2> there a way of measureing the preload I am putting on a bearing ?
[11:02:25] <__rob2> so when I tighten down the nut
[11:02:46] <__rob2> agaist the washer that presses the inner race
[11:03:08] <__rob2> am just feeling at the moment, but would be nice to actually know what that is
[11:03:13] <zeeshan|2> dial indicator
[11:03:32] <__rob2> right, but that doesn't give me the force applied to the bearings ?
[11:03:40] <zeeshan|2> why not
[11:03:44] <zeeshan|2> you got the pitch of the screw
[11:03:54] <zeeshan|2> how know the lead
[11:03:57] <zeeshan|2> you know the diameter
[11:04:13] <zeeshan|2> (lead is what youre measuring from the dial indicator)
[11:04:43] <zeeshan|2> rob the way ive seen it/done it on cars
[11:05:03] <zeeshan|2> is you put a bit of solder in between the two spots
[11:05:16] <zeeshan|2> w/ an appropriate shim
[11:05:21] <zeeshan|2> and measure the thickness of the solder after
[11:06:36] <zeeshan|2> the other way was using a sensitive inch-lb torque wrench
[11:07:06] <zeeshan|2> and turning the pinion w/ it
[11:07:18] <zeeshan|2> but im not sure how they relate preload w/ friction
[11:07:22] <zeeshan|2> F= uN?
[11:07:49] <zeeshan|2> F = Torque / distance
[11:07:53] <zeeshan|2> maybe a combination of those two equations
[11:07:58] <zeeshan|2> but im not sure what u would be
[11:09:51] <__rob2> let me paste my setup
[11:10:27] <Tom_itx> zeeshan|2 subaru up an runnin yet?
[11:10:50] <anomynous> pasting a setup sounds expensive
[11:10:54] <zeeshan|2> no
[11:10:54] <Sync_> __rob2: by feel is enough
[11:10:55] <zeeshan|2> been sick
[11:10:56] <__rob2> picture
[11:10:58] <Sync_> pfft zeeshan|2
[11:11:05] <Sync_> excuses
[11:11:06] <archivist> take up the play, know the spring rate, do up distance calculated from spring rate
[11:11:18] <__rob2> http://i.snag.gy/AiONI.jpg
[11:11:19] <zeeshan|2> been working on the rx7 wire harness
[11:11:44] <__rob2> so the collars all press the inner race
[11:12:12] <Tom_itx> so too sick for subarururu but not for rx7
[11:12:17] <zeeshan|2> :)
[11:12:18] <__rob2> the nut (or actually 2 nuts) tighten down against the collars
[11:12:26] <__rob2> the optional, I have no way to preload
[11:12:35] <__rob2> cant get a nut on there
[11:12:41] <Tom_itx> yeah i've got a head cold too
[11:13:12] <Sync_> usually you just turn a shoulder into the shaft
[11:13:22] <Sync_> and the other side is floating axially so the shaft can expand
[11:13:37] <__rob2> those shaft collars are turned so its a smaller diameter
[11:13:56] <__rob2> for the bit that touches the inner race
[11:14:39] <__rob2> between the optional bearing, and the far right bearing is a timing pulley. Which is quite tight, to counter any deflection of the axle I put a bearing in there
[11:14:42] <__rob2> prob not needed
[11:14:56] <__rob2> as the shaft is 5mm silver steel
[11:16:09] <__rob2> also, the reason for the opposed bearings on the left is assembly, I need that ridgidly held radially, before the right hand side is fitted
[11:17:05] <__rob2> thats gotta be good enuf for 0 radial movement right ?
[11:19:06] <__rob2> also sync, I wanted to avoid having to turn the shaft
[11:19:28] <__rob2> so I dont end up with a 5mm shaft with eccentric 4mm end
[11:20:32] <__rob2> really want this as good as possible. Theres a sensor going into an fpga and the encoder into the fpga
[11:20:44] <__rob2> and I need as really precise angular location
[11:21:16] <__rob2> so dodgy machining will cause loads of problems
[11:25:33] <__rob2> so on the face it of my drawing looks reasonable ?
[11:35:07] <Sync_> turning it should not be a problem
[11:41:25] <maxcnc> hi
[11:42:11] <maxcnc> wicki: ?
[11:43:11] <__rob2> Sync_ not sure my proxxon is up to the task
[11:43:16] <maxcnc> __rob2: is it a homade rail system
[11:43:21] <__rob2> no
[11:43:36] <__rob2> its actually some precision optics on top
[11:44:19] <maxcnc> cool stuff
[11:44:30] <__rob2> if it works :)
[11:44:47] <maxcnc> try and error to build better
[11:45:51] <__rob2> yea, well so far its all pretty tight
[11:46:16] <__rob2> https://goo.gl/photos/uA2Sjk7NTn6WP7nD7
[11:46:19] <__rob2> thats without any preload
[11:46:23] <maxcnc> its a real wet day here nothing outside to go jogging or even walk
[11:47:34] <__rob2> will likely flop about tho if its on its side
[11:48:11] <maxcnc> it will fit your need at that space
[11:48:21] <maxcnc> pretty shure
[11:48:29] <__rob2> you mean my method mentioned above ?
[11:48:44] <maxcnc> yes
[11:48:49] <__rob2> yea, its all small stuff, no shock loads or anything dynamic
[11:49:23] <maxcnc> but its also alot of work into it
[11:49:29] <maxcnc> nothing simple
[11:51:06] <__rob2> cool, thanks
[12:23:45] <maxcnc> im off Gn8
[13:07:35] <DRGray> __rob2: what are the optics for?
[13:41:39] <Erant> I'm having some rather annoying problems with my 7i78...
[13:42:09] <Erant> pcw_home: The 74HCT540 buffer chip gets really hot the moment I plug in any axis.
[13:43:09] <DRGray> wiring things up wrong?
[13:43:10] <Erant> My X and Z axes work despite that, but the Y only works if I unplug the X.
[13:43:18] <Erant> It's worked for the past 6 months.
[13:43:22] <Erant> So I doubt that.
[13:43:39] <Erant> Problems only started showing up last week or so.
[13:46:22] <Erant> And it's not like it's complicated wiring. 
[13:47:18] <DRGray> some sort of short somewhere
[13:47:37] <DRGray> check everything over with a multimetre?
[13:49:03] <Erant> I will, but it's unlikely.
[13:49:18] <Erant> The chip doesn't get hot if I turn off the drives.
[13:50:13] <pcw_home> sound like the output is shorted
[13:50:18] <pcw_home> sounds
[13:52:04] <pcw_home> The outputs are differential and referred to ground ( DO NOT TIE EITHER + or - STEP/DIR OUTPUT TO 5V or GROUND )
[13:52:50] <Erant> So unless the system needs terminating resistors that I wasn't aware of...
[13:53:33] <Erant> pcw_home: If the output was shorted... Wouldn't the system just not work?
[13:54:30] <Erant> And it can't be a passive short, the chip doesn't heat up if the servo drives are off...
[13:55:31] <pcw_home> do you have any outputs connected to 5V or ground?
[13:55:45] <pcw_home> thats what it sounds like to me
[13:56:11] <Erant> Nope, but let me triple-check my wiring.
[13:56:32] <Erant> I'm just confused as to why it would've worked for a good... 4-ish months and suddenly decided to stop working.
[13:59:22] <pcw_home> we have had quite a few people wire differential outputs wrong ( they think the STEP- needs to be grounded if they just use STEP+)
[14:00:12] <Loetmichel> uups... wrong plug... (i am cleaning below the desk, tomorrw comes the central heating guy, putting new battieres in the radiator heat measuring devices)
[14:00:49] <DRGray> anybody here use the london hack space?
[14:02:15] <Erant> pcw_home: I'd like to think that I wouldn't do that, it certainly would've been a waste of those years studying EE.
[14:02:41] <Erant> But let me find my multimeter and beep this out.
[14:02:57] <Erant> I'm always amazed by how quickly I can lose this giant yellow piece of plastic...
[14:04:28] <DRGray> everything wears out after a while
[14:38:54] <Erant> Well that's... interesting.
[14:39:09] <Erant> The DIR diff pair is being actively driven from the servo drive at startup...
[14:39:54] <_methods> i put my multimeter on one of those adjustable lamp arms so i always know where it is
[14:40:10] <_methods> and i can move it all over my work area and keep it up out of the way
[14:44:39] <Erant> Yeah, but I always figure it's big and yellow and how can I possibly lose it...
[14:48:14] <_methods> i'm pretty sure the more obvious the tool is the easier it is to lose
[14:48:25] <_methods> i have this bright orange hammer i can never seem to find
[14:49:25] <yasnak> haha same
[14:49:43] <yasnak> for some reason that one always hides the best, the black ones are always under the table i just can't see them
[14:58:54] <Loetmichel> aaand that was the network-switch-wallwart... good to know ;-)
[15:08:28] <Duc_main> not sure why the wife lets me touch the circuit breaker panel for the house
[16:21:52] <XXCoder> https://www.facebook.com/Trustmeiamamechanicalengineer/videos/677204355754504/
[16:37:31] <Deejay> gn8
[17:03:13] <Erant> pcw_home: I found that for whatever reason the DIR diff pair was being actively driven from the servo drive...
[17:03:34] <Erant> Reflash with the correct configuration solved it. Not sure how it got in that state...
[17:54:16] <pcw_home> funny, how did it go bad by itself?
[18:09:27] <ve7it> http://www.ebay.ca/itm/272084833173 a good price on brushless drives 15amp peak, 80v with encoder interface, I just received 4 in as new condition
[18:10:27] <enleth> pcw_home: where would I look for descriptions of 5i25/6i25 prebuilt bitfiles that are not mentioned in the card docs? like "Rmev4" or "mev4" in case of 7i77x2
[18:12:03] <pcw_home> R means reverse
[18:12:41] <pcw_home> mev4 means muxed encoder Version 4
[18:14:20] <enleth> any other way to know that besides bothering you on IRC?
[18:15:05] <pcw_home> There a fair number of basically custom bitfiles, not of much use in general
[18:16:10] <pcw_home> D means DPLL ( though those are mostly used for Ethernet configs )
[18:17:39] <enleth> OK, got it
[18:17:52] <pcw_home> the real reference is the .pin file
[18:20:00] <enleth> does "reverse" mean just, like, reversed pins on the DB25 connector?
[18:20:23] <enleth> no, wait
[18:20:31] <enleth> it's P2 and P3 swapped
[18:20:56] <enleth> my diff-fu is weak today
[18:21:32] <andypugh> enleth: If you can find the vhdl file, that’s fairly legible
[18:22:19] <pcw_home> yeah the pinout files are sort of readable with the right tab settings
[18:22:22] <andypugh> ve7it: I have some drives identical to that one, except for the paint. Mine say “AMC"
[18:23:29] <andypugh> Ah, no, mine are PWM/DIR
[18:23:55] <andypugh> But i am pretty sure those are AMC with different screen-print
[18:24:25] <enleth> andypugh: if I can find it, yeah. Haven't been digging into the sources yet
[18:24:55] <pcw_home> one picture shows the AMC PN
[18:24:56] <andypugh> enleth: http://git.linuxcnc.org/gitweb?p=hostmot2-firmware.git;a=tree Look at the PIN_….._.vhd files.
[18:27:18] <enleth> is this repo a copy of 5i25.zip from mesa website, or the other way around?
[18:27:59] <enleth> (well, sure not a *copy*, the zip contains binaries too)
[18:31:37] <pcw_home> 5i25.zip is probably a bit more up-to date
[18:32:42] <enleth> ack
[18:40:53] <ve7it> andypugh, yes... I am pretty sure they are rebadged amcs..... I have some 100v servo motors, so I wanted something to get them turning... should be usable at reduced rpm with 75vdc bus
[18:46:39] <enleth> it'a a pity AMCs for higher volateges are so rare
[18:55:55] <Crom> anyone get one of these? http://www.ebay.com/itm/161859699061
[18:56:39] <Crom> China knock off of a Noga idicator?
[18:57:43] <Crom> holder
[18:57:46] <CaptHindsight> as long as it doesn't wiggle or bend when it's holding the indicator it should be fine
[18:57:48] <_methods> yeah i got one
[18:57:58] <_methods> it's no noga for sure
[18:58:00] <Crom> decent?
[18:58:00] <_methods> but it works
[18:58:21] <Crom> good I just ordered one
[18:58:22] <_methods> i have the adjustable head one though
[18:58:31] <_methods> that one doesn't have the fine adjust
[18:59:01] <CaptHindsight> make sure it uses a magnet vs black hole since you want it to be useful for many years
[18:59:09] <Crom> that's fine... it's just for clocking in my 4 jaw, I can turn the bezel
[18:59:28] <_methods> yeah as long as you don't need teh fine adjust you'll be good to go
[19:06:40] <HoloPed> checkout my laser engraver project. https://lazygeckoblog.wordpress.com/
[19:09:50] <Sync_> Crom: they are bad
[19:09:53] <Sync_> get a real one
[19:10:10] <Sync_> the clamping needs high torque and is fiddly
[19:13:21] <Crom> when I can afford the $80 I';ll get one... until then the $12 will work
[19:14:22] <pink_vampire> I'm looking for good and nice 1" arbor for slitting saw.
[19:16:08] <Sync_> I would not want to use one again, they are just annoying
[19:17:07] <Sync_> just get a generic one pink_vampire, for slitting saws runout is unimportant
[19:17:48] <pink_vampire> Crom: it's PINK!! <3
[19:18:16] <pink_vampire> but why zip ties??
[19:18:40] <Crom> yes it is! a very manly colour!
[19:18:54] <CaptHindsight> HoloPed: how much less straight is an acrylic machine frame vs a t-slot frame?
[19:19:04] <XXCoder> pink used to be man color and blue woman color
[19:19:08] <Crom> didn't want a girly robin blue
[19:19:10] <XXCoder> it somehow switched places
[19:19:43] <Crom> <-- into steam punk, and shakespeare so robin blue is girly and pink is manly
[19:19:47] <HoloPed> CaptHindsight, I didn't measure it but you can see the acrylic frame distort when the head changes direction and forces are applied to the pullys
[19:19:55] <CaptHindsight> does it depend on the type of acrylic used and the source of the t-slot?
[19:20:01] <pink_vampire> pink it's my color. but my machine is green :(
[19:20:19] <HoloPed> CaptHindsight, it depends how the t-slot is held together
[19:20:26] <Crom> well then paint it!1
[19:20:41] <HoloPed> acrylic should be avoided, it really not suited for mechanical parts or frame
[19:20:42] <CaptHindsight> how much was the accuracy and repeatability improved by the use of t-slot?
[19:20:50] <HoloPed> it will crack, just a matter of when
[19:21:12] <pink_vampire> Crom: look at that
[19:21:14] <CaptHindsight> will the use of a cast iron frame improve it further?
[19:21:24] <HoloPed> I doubt it
[19:21:33] <pink_vampire> http://i.imgur.com/pnEGG0h.png
[19:21:36] <HoloPed> Aluminum is pretty rigid
[19:21:36] <CaptHindsight> will the use of epoxy granite improve it even more?
[19:21:55] <pink_vampire> Crom: ^
[19:21:57] <HoloPed> will a single molecule diamond frame improve it ?
[19:22:04] <CaptHindsight> have there been any actual measurements made?
[19:22:17] <HoloPed> what about neutoronium ?
[19:22:30] <CaptHindsight> is this opinion or are there any facts?
[19:22:41] <Crom> pink_vampire, :) that's a nice color... more purple than pink
[19:22:45] <HoloPed> CaptHindsight, did you actually read the blog ?
[19:22:54] <HoloPed> I engraved a square, comes out with curved sides
[19:23:02] <HoloPed> I don't need to measure it to know its crap
[19:23:27] <pink_vampire> Crom: http://i.imgur.com/zopeOzP.png this is the machinewith the panel
[19:23:39] <CaptHindsight> I didn't see any numbers
[19:23:43] <HoloPed> 7
[19:23:46] <HoloPed> how's that
[19:23:48] <HoloPed> I have more
[19:23:58] <HoloPed> 91.2
[19:24:34] <CaptHindsight> any ridiculous or imaginary numbers?
[19:24:40] <_methods> 42?
[19:24:50] <HoloPed> How about a transcendental number
[19:24:54] <HoloPed> e
[19:25:01] <Crom> when I get my VA check I'll be getting a Bolton ZX45 I think
[19:25:24] <pink_vampire> 1.6180339887498948482
[19:25:33] <pink_vampire> Golden_ratio
[19:25:37] <CaptHindsight> I felt that the entire blog was enigmatic
[19:25:54] <HoloPed> I suggest you don't read it then
[19:25:54] <CaptHindsight> and whispy
[19:26:11] <HoloPed> Actually, I would prefer if you didn't read it
[19:26:29] <CaptHindsight> I didn't see any recipes for cookies either
[19:26:46] <HoloPed> with numbers
[19:27:15] <XXCoder> &a227
[19:27:21] <XXCoder> $a227
[19:27:25] <XXCoder> bah dont work heh
[19:27:51] <CaptHindsight> does & represent?
[19:28:30] <pink_vampire> https://www.youtube.com/watch?v=Vg7SCXOh-KY
[19:28:34] <CaptHindsight> can "a" be any known number?
[19:29:06] <pink_vampire> what do you think about the rotary broach?
[19:29:44] <Sync_> it's a common tool for such things
[19:30:13] <XXCoder> CaptHindsight: hexchat is supposed to convert it to PI symbol
[19:30:26] <XXCoder> I must be doing it wrong or something
[19:30:58] <CaptHindsight> π
[19:31:08] <CaptHindsight> you can have mine
[19:31:13] <XXCoder> lol thanks
[19:31:15] <CaptHindsight> I'm full
[19:32:36] <HoloPed> CaptHindsight, did you know that 0.9999~ equals one
[19:32:52] <HoloPed> (~ is repeat forever)
[19:32:52] <CaptHindsight> juan?
[19:32:56] <XXCoder> HoloPed: as long as 999s do not end
[19:33:22] <Sync_> HoloPed: what does the littlerp use as a mirror and window?
[19:33:47] <HoloPed> Sync_, there is a front surface mirror , not sure what you mean by window
[19:33:50] <HoloPed> you mean the vat ?
[19:33:52] <CaptHindsight> if infinities may be different sizes can integers also be different sizes?
[19:34:07] <HoloPed> sure you can have little 2 and big 2
[19:34:14] <HoloPed> 2>=2
[19:34:39] <CaptHindsight> the LittleRP's best use is extracting $ from the unwary
[19:35:21] <XXCoder> CaptHindsight: http://www.lukesurl.com/archives/comic/082-infinite-crisis/comic-2008-11-19-numbers-gif
[19:35:24] <HoloPed> its second best use is to print stuff
[19:35:29] <HoloPed> third best use as a door stop
[19:35:35] <Sync_> yeah, the vat
[19:35:38] <HoloPed> forth best as a cat
[19:35:40] <CaptHindsight> some of it's owners are actually concerned about the amount of shrink of the photopolymers used with it
[19:35:53] <HoloPed> Sync_, petri dish with PDMS or a teflon foil
[19:35:57] <HoloPed> you actually get both
[19:36:27] <HoloPed> the teflon is flexible , it helps with detaching the print when the build plate rises
[19:36:46] <HoloPed> works very well, but the cure time is a bit longer
[19:37:20] <HoloPed> CaptHindsight, that totally depends on the resin, not the printer
[19:37:29] <HoloPed> do you have numbers to back up that claim ?
[19:37:35] <HoloPed> how many owners, exactly
[19:37:56] <HoloPed> how much concerned are they, on a scale of -7 to pi
[19:39:22] <Sync_> hm, so probably boro
[19:40:53] <CaptHindsight> Sync_: it doesn't need anything more than a cheap front surface mirror
[19:41:10] <Sync_> which is not ideal, although I'm not so sure about the output of the projectors lamp
[19:42:51] <CaptHindsight> they are designed for RGB so they pass 400-700nm pretty well
[19:43:21] <Sync_> yeah but you really want 300-400
[19:43:32] <CaptHindsight> nope
[19:43:56] <CaptHindsight> well unless you're using resin only sensitive to that range
[19:44:03] <HoloPed> you disappoint me CaptHindsight
[19:44:16] <CaptHindsight> which nobody in the hobby wants to pay for
[19:44:34] <Sync_> well, most of the resins I have worked with have their highest efficiencies there
[19:45:30] <CaptHindsight> it's cheaper and easier to build systems >400nm
[19:45:53] <HoloPed> how much cheaper
[19:46:15] <HoloPed> I don't approve of your baseless and whimsical comments
[19:46:21] <HoloPed> where is the data
[19:46:46] <CaptHindsight> copy cat
[19:46:53] <_methods> hahah
[19:46:58] <CaptHindsight> lol
[19:47:51] <CaptHindsight> is $reprap broken again?
[19:48:04] <malcom2073_> HoloPed: If there's one thing you can count on in here, it's CaptHindsight trolling 3d printing people
[19:48:13] <malcom2073_> You're barking at a brick wall :)
[19:48:52] <Sync_> CaptHindsight: I see no reason to go >400nm
[19:49:06] <CaptHindsight> it ok
[19:49:08] <Sync_> all of the resins I see have their highest efficiencies below that
[19:50:17] <CaptHindsight> mostly con men and fanboys
[21:14:12] <pink_vampire> I'm a bit lost with the calculations for the edm.
[21:14:36] <pink_vampire> I know that for each step I go 5 microns.
[21:15:31] <pink_vampire> I know that the minimum distance from the material before short circuit is one step away so it 5 microns.
[21:16:43] <pink_vampire> ans I need to eat at least 5 microns of material before sink down one step.
[21:17:44] <pink_vampire> so 5 + 5 + some safety margin bring me to 12 micron maximum gap.
[21:19:00] <pink_vampire> now for example if I want to use distillate water as my dielectric fluid.
[21:20:03] <pink_vampire> I need to calculate the what is the minimum DC voltage that require to make a spark between 2 electrodes in distillate water.
[21:20:14] <pink_vampire> and here I need some help.
[21:20:22] <pink_vampire> someone here?
[21:21:56] <pink_vampire> distilled ** why it make it distillate O_o?
[21:22:11] <PetefromTn_> I'd like to help you......but I don't know what the hell you are talking about ;)
[21:22:54] <pink_vampire> PetefromTn_: if you have a spark gap.
[21:23:50] <pink_vampire> PetefromTn_: how do you know what is the minimum voltage that can jump between the electrodes of the spark gap?
[21:24:08] <Tom_itx> distilled water is nonconductive
[21:24:57] <pink_vampire> Tom_itx: also air, vacuum and plastic
[21:25:08] <Tom_itx> better coolant
[21:25:17] <Tom_itx> use submerged edm
[21:25:28] <pink_vampire> but you can see that in some voltages you can get a spark.
[21:26:00] <Tom_itx> you already know more about EDM than i do.
[21:26:26] <pink_vampire> I want to use water so the fumes will be non-toxic,
[21:27:08] <pink_vampire> the EDM dielectric fluid make toxic fumes.
[21:27:33] <Tom_itx> and probably more efficient
[21:27:51] <Tom_itx> use ventilation
[21:27:53] <pink_vampire> maybe..
[21:28:04] <pink_vampire> or just water..
[21:28:50] <pink_vampire> anyway.. to be able to use any material even air, I need to know how to calculate it.
[21:30:44] <pink_vampire> Tom_itx: ^
[21:31:01] <Tom_itx> http://edmtechman.com/about.cfm?pg=2&chap=3
[21:32:55] <PetefromTn_> jeez man remind me to never move again...
[21:33:05] <Tom_itx> hey Pete...
[21:33:18] <Tom_itx> don't ever ever move again
[21:33:18] <PetefromTn_> hey tom
[21:33:24] <PetefromTn_> thanks man
[21:33:44] <Tom_itx> or if you do... do it before you unpack
[21:33:50] <Sync_> what makes you think that if you use water it will be non toxic pink_vampire?
[21:34:03] <Tom_itx> Sync_ i bet a wag
[21:34:41] <pink_vampire> I'm sure it will not contain oil fumes.
[21:34:44] <PetefromTn_> I know right
[21:35:09] <PetefromTn_> it would not have been so bad if we did not have so much work to do on the house in addition to the actual moving work
[21:35:37] <pink_vampire> I know that I will get some oxidation of the metals.. so yeah some times you can get some stuff from that.
[21:36:31] <pink_vampire> but in general. the fumes are bubbles from the boiling that happen from the spark.
[21:37:22] <pink_vampire> so boiling water VS boiling oil..
[21:37:54] <Tom_itx> any outgassing of the metal during the spark?
[21:38:05] <Tom_itx> as it's removed
[21:40:42] <pink_vampire> lets see, what you have. the main parts are iron from the metal, carbon from the electrode, and oxygen and hydrogen in the water.
[21:41:28] <Tom_itx> assuming you're cutting iron, and using a carbon electrode
[21:41:53] <pink_vampire> most likely that the carbon will not react with the carbon..
[21:42:10] <pink_vampire> but it will react with the oxygen in the water.
[21:42:35] <pink_vampire> so I think you will get iron oxide
[21:42:45] <pink_vampire> and yellow color in the water.
[21:43:36] <pink_vampire> the leftovers hydrogen will also come as bubbles.
[21:45:24] <pink_vampire> I think that in the industry they want to avoid oxidation of the metal so they use non water based liquid.
[21:46:12] <pink_vampire> Tom_itx: ? PetefromTn_?
[21:49:45] <Tom_itx> i told you, you already know more about it than i do
[21:50:11] <Tom_itx> the rest i'd just be googling for you
[21:50:28] <pink_vampire> I'm now google much..
[21:51:22] <pink_vampire> I want to make it from my knowledge, I don't like copy paste solutions
[21:51:42] <pink_vampire> now = not
[21:52:10] <PetefromTn_> Like Tom you probably know more about it than I do. Sorry pink
[21:52:26] <pink_vampire> stupid stupid autocomplete
[22:13:20] <CaptHindsight> pink_vampire: tomp would most likely give you his advice after 40 years in EDM
[22:13:33] <CaptHindsight> post on the mail list
[22:13:52] <CaptHindsight> there is a recent thread on Linuxcnc with EDM
[22:14:12] <pink_vampire> CaptHindsight: what advice?
[22:15:01] <pink_vampire> CaptHindsight: I want to know how to *calculate* the require voltage.
[22:15:33] <CaptHindsight> he'd jump right to the big picture vs answer your question
[22:15:41] <CaptHindsight> save everyone some time
[22:17:09] <CaptHindsight> Distilled water 65 - 70, Substance Dielectric Strength (MV/m)
[22:17:54] <Jymmm> CaptHindsight: https://www.youtube.com/watch?feature=player_detailpage&v=5XcKBmdfpWs#t=99
[22:18:13] <pink_vampire> what is MV/m? mega volt / meter?
[22:18:30] <CaptHindsight> yup
[22:19:04] <pink_vampire> so I need to convert it to 12 microns..
[22:19:31] <CaptHindsight> shit, yeah :(
[22:19:35] <pink_vampire> so it's 65,000,000 volt for 1 meter?
[22:19:47] <pink_vampire> CaptHindsight: ?
[22:20:17] <CaptHindsight> microns http://whatis.techtarget.com/definition/micron
[22:20:39] <pink_vampire> I know what is a micron..
[22:20:45] <CaptHindsight> hint, 1000um = 1mm
[22:20:48] <CaptHindsight> ah good
[22:21:09] <pink_vampire> but I'm not sure about 65,000,000 volt for 1 meter?
[22:21:19] <CaptHindsight> so the rest is academic
[22:21:57] <CaptHindsight> well you can find your own source for the dielectric breakdown voltage of DI water
[22:22:05] <CaptHindsight> and use that
[22:23:51] <pink_vampire> I just don't understand 100% of the 65-75 is basically in millions
[22:24:39] <CaptHindsight> https://en.wikipedia.org/wiki/Dielectric_strength
[22:25:00] <SpeedEvil> What that means is for pure water, it will take 75MV to make an arc across it with a purely homogenous field
[22:25:22] <pink_vampire> ok.
[22:25:27] <SpeedEvil> pure water is quite a good insulator.
[22:25:29] <SpeedEvil> But.
[22:26:08] <SpeedEvil> Even pure water at that voltage would conduct a large amount of current.
[22:26:15] <SpeedEvil> It's just it wouldn't arc
[22:28:54] <pink_vampire> so accordion to the calculations, I need 900V to jump across 12 microns in distilled water?
[22:28:57] <toastyde1th> that's more voltage than jesus
[22:29:39] <pink_vampire> now Silicone oil, mineral oil[3][5] 10 - 15
[22:29:49] <pink_vampire> so for 15
[22:29:59] <Jymmm> I know that 18MV jumps 1.5" in air.... And hurts like a bitch!
[22:30:06] <pink_vampire> I need 180V
[22:30:35] <pink_vampire> Jymmm: I'm talking about 12 micron gap.
[22:33:10] <pink_vampire> now what about salt water.
[22:36:09] <SpeedEvil> Dielectric strength and conductivity are not directly related
[22:36:35] <SpeedEvil> For EDM, you do not as I understand it want it to conduct - this is electrochemical machining.
[22:36:40] <SpeedEvil> you want an actual arc
[22:37:47] <pink_vampire> ok..
[22:38:39] <pink_vampire> so with mineral oil that it's 2.1 I'm getting 25.2V
[22:38:55] <pink_vampire> that it's very nice to work with.
[22:39:33] <pink_vampire> olive oil it's 3.1 and need 37.5V
[22:41:18] <pink_vampire> no no
[22:41:25] <pink_vampire> opps my mistake.
[22:41:30] <pink_vampire> wrong table
[22:42:18] <pink_vampire> oil it's 15 and need 180V
[22:54:41] <Sync_> just use diesel
[23:30:15] <Crom> my pops always used kerosene for EDM
[23:32:51] <Crom> back in 1977ish