#linuxcnc | Logs for 2013-12-18

[00:34:20] <RyanS> That was fun and not as difficult as I thought drilling through 30mm thick cast iron with 89mm holesaw
[00:40:22] <uw> th ekey is 2500rpm and no lube
[00:42:10] <RyanS> minus 2400rpm :P
[01:35:29] <archivist> cast can be nice http://www.collection.archivist.info/searchv13.php?searchstr=pendulum+cast
[01:37:36] <RyanS> jeez, how did you shine it up that good?
[01:39:46] <RyanS> emory cloth & so forth?
[01:52:49] <Mr_Mayhem> I always thought of cast iran as dull. Huh, it can be made shiny. Didn't know that.
[01:54:15] <Mr_Mayhem> Nice archive, btw. Will have to look around.
[01:57:09] <Mr_Mayhem> I picture your archive web server up in a castle on a stormy night, with a single candle in the window. Lathe slowly turning out tiny gears... hehe.
[01:59:38] <RyanS> More like a lounge room full of oscilloscopes
[02:04:33] <Mr_Mayhem> hehe
[02:05:06] <Mr_Mayhem> The Professor from Futuramam, lol
[02:05:14] <Mr_Mayhem> Futurama
[02:05:37] <Mr_Mayhem> Nice collection of goodies.
[02:09:10] <Deejay> moin
[02:45:26] <Jymmm> Leaf Log maker https://www.youtube.com/watch?v=hFSVtJbpHF8
[03:02:31] <RyanS> Model makers are so obsessed with their Myford lathes....
[05:01:14] <RyanS> anybody machined a split collar before?
[05:04:41] <RyanS> no idea how wide to make the split without getting into how much particular metals deflect and clamping force
[05:22:29] <jthornton> yea
[09:28:05] <Deejay> re
[09:59:40] <archivist_herron> http://www.gifbin.com/985266
[10:03:14] <cradek> yikes, that spread fast, maybe fresh hair spray
[10:03:25] <cradek> glad they got it out fast
[11:02:58] <jthornton> cheap hairspray makes good potato gun propellant
[11:04:52] <ReadError_> wd40 works well too
[11:06:22] <syyl--> i think everything out of a spraycan works ;)
[11:06:38] <syyl--> ok, maybe no fire-extinguish spray ;)
[11:07:57] <jackc_> back in college we found that you get the highest muzzle energy with compressed air and a quarter-turn valve vs combustion ;-)
[11:08:04] <CaptHindsight> we used hairspray as a propellant for tennis ball cannons made from soda cans
[11:08:13] <jackc_> but failing that, multiple spark gaps for multiple flame fronts helps too
[11:08:57] <syyl--> i prefer air to, jackc_ ;)
[11:09:07] <syyl--> just because its not illegal over here ;)
[11:09:16] <jackc_> haha thats a positive for sure
[11:09:34] <jackc_> even if science is mostly legal over here, the general populace is still pretty concerned
[11:09:36] <syyl--> propelling a projectile with hot gas counts as a gun, here
[11:09:41] <syyl--> ...
[11:09:56] <jackc_> my landlord told my neighbors it looks like im building weapons of mass destruction in the basement
[11:10:24] <jackc_> due to the tools and in-progress projects
[11:10:57] <syyl--> i think that happens to every homeshop
[11:11:07] <syyl--> "are you building a bomb in there?!"
[11:11:09] <jackc_> haha
[11:11:42] <syyl--> "no, i do that in the shop located in a hollowed out volcano"
[11:11:52] <syyl--> "not in the basement"
[11:12:59] <jackc_> i think it was the microwave dishes that looked most scary to this guy
[11:13:16] <syyl--> hr
[11:13:18] <syyl--> :D
[11:20:54] <TekniQue> 16:51:54 < jackc_> back in college we found that you get the highest muzzle energy with compressed air and a quarter-turn valve vs combustion ;-)
[11:21:07] <TekniQue> yeah, thing is combustion in still air is very slow
[11:21:36] <TekniQue> the laminar burn rate of a typical mixture of hydrocarbon fuel and air is very slow
[11:22:47] <jackc_> ya
[11:23:09] <jackc_> we did one with pure o2 and h2
[11:23:13] <jackc_> ...once
[11:23:52] <TekniQue> in an internal combustion engine you have very fast combustion because the air is moving very fast
[11:24:15] <TekniQue> the sudden compression makes for some turbulent mixing of the air:fuel mixture inside a spark ignition engine
[11:24:38] <pcw_home> C2H2 and 02 is pretty fast...
[11:24:56] <jackc_> no doubt
[11:25:01] <TekniQue> yeah pure oxygen is a game changer
[11:37:28] <IchGuckLive> Hi all B=
[11:37:30] <IchGuckLive> O.O
[11:38:12] <IchGuckLive> someone has seen the chncguy or is he lost ot the russion board
[11:38:46] <IchGuckLive> seen! CHNCguy
[11:39:19] <Connor> anyone hooked up a set of iGaging scales to Linuxcnc and used it for closed loop? Wondering if it's possible.. and, if so, how well it works.
[11:40:11] <IchGuckLive> close loop is gaga only for freaks normel cheescake bakers use a bench of steplosses
[11:40:36] <cradek> if the scales give something like quadrature, it would work fine, but those cheap ones that are made for human reading usually don't have usable signals or update rates
[11:40:49] <cradek> updating 10 times a second is totally fine for humans, unusable for cnc
[11:41:04] <Connor> okay, that's what I thought.
[11:41:22] <cradek> well I don't have particular experience with that brand
[11:41:31] <cradek> just a warning of what to look for
[11:41:31] <IchGuckLive> why not using the new leadshine HSB drivers they gone correct the stepeprs
[11:41:38] <skunkworks> even our old 60s vintage cnc updated 250 times a second...
[11:41:42] <skunkworks> *nc
[11:41:56] <cradek> I hear some old machines had 100Hz updates
[11:42:10] <pcw_home> normel cheescake bakers?
[11:42:12] <cradek> with velocity mode servos and modest accelerations that's pretty adequate I bet
[11:42:24] <skunkworks> sure
[11:42:27] <IchGuckLive> pcw_home: freeks like me
[11:42:41] <cradek> IchGuckLive sounds slightly drunk today
[11:42:49] <IchGuckLive> O.O
[11:43:07] <skunkworks> christmas dinner here today.. I ate too much...
[11:43:44] <IchGuckLive> http://www.ebay.de/itm/3-sets-Leadshine-4-Nm-HBS-Closed-Loop-Stepper-Motor-Driver-Encoder-/281030451641
[11:44:07] <Connor> I was just thinking it would be nice to have a absolute readout.. and if possible tie it back into linuxcnc for closed loop, but sounds like they're for human only..
[11:44:40] <IchGuckLive> the hbs drivers report back to linuxcnc
[11:44:46] <Connor> IchGuckLive: My machine costs as much as one of those drives!
[11:45:22] <Connor> And, that's still not absolute position..
[11:45:40] <Connor> Only way is to use linear scales.
[11:45:59] <IchGuckLive> agree but its the future and almost that what people want at this time
[11:47:37] <archivist> steppers are not the future, I for one will not promote them as such
[11:47:52] <IchGuckLive> i live at the big mashines at 10mm failu NP and the plasmas are at 1mm
[11:47:55] <CaptHindsight> Nema 34, 4 Nm Stepper motor
[11:48:18] <archivist> large steppers are too slow
[11:48:29] <IchGuckLive> i use the 3Nm for 40 euros
[11:48:34] <CaptHindsight> what are we moving?
[11:48:53] <IchGuckLive> CaptHindsight: chees
[11:49:17] <CaptHindsight> no limberger I hope
[11:49:46] <jdh> can you really compensate for missed steps with those leadshine drives or just get a following error?
[11:50:15] <CaptHindsight> not sure of those exact model Leadshine
[11:50:36] <archivist> the drive itself may try to catch up
[11:50:48] <jdh> by trying the step again?
[11:50:52] <archivist> but it is a fail at that stage already
[11:51:12] <jdh> does it know/care what part of the step sequence it is in?
[11:51:14] <IchGuckLive> nothing cpompare to absolut
[11:51:30] <jdh> and whatever caused it to not step is just as likely still true
[11:51:47] <CaptHindsight> same for a servo
[11:52:01] <CaptHindsight> whatever caused the position to be not as expected
[11:52:04] <jdh> servo can increase current
[11:52:49] <jdh> stepper would have to slow down, so all the other axes would have to compensate for that also
[11:52:56] <IchGuckLive> !seen CHNCguy
[11:52:57] <the_wench> last seen in 2013-12-17 06:25:35, seems to have quit or joined and I dont have a message
[11:53:11] <CaptHindsight> so what happens if you stick a wrench in the sprocket of a closed loop stepper? Does it keep trying?
[11:53:21] <Connor> jdh: Exactly, the closed loop is ONLY to the stepper driver..not to linuxcnc.. so, it would just send a fault.
[11:53:49] <jdh> CaptHindsight: no clue, encoders on steppers seem silly other than for fault detection
[11:54:04] <jdh> but, the number of things I don't know often amazes me.
[11:54:27] <Connor> Now, you CAN run scales with steppers.. I think I saw something about running steppers in some sort of torque mode.. or torque simulation mode..
[11:54:33] <archivist> if you have ever run a stepper lowly through the resonant region of its range you would avoid them like the plague for ever more
[11:54:39] <archivist> slowly
[11:55:07] <jdh> nah, they are fine if sized and used within their envelope
[11:55:14] <Connor> archivist: They have there place. For low end machines..
[11:55:29] <jdh> <- low end.
[11:56:18] <archivist> I have steppers and am implementing a stepper system for someone, does not make me like them though
[11:57:54] <jdh> I'm not so sure my device would benefit from servos.
[11:58:06] <jdh> but, if you want to send me some, I'll try it out.
[11:58:15] <IchGuckLive> so new leadshine MX series goes Gecko540
[11:58:25] <IchGuckLive> whow multiaxis
[11:58:32] <jdh> I think keling has those on their site now.
[11:59:05] <Connor> Yes. Frankly, I stick to individual units.
[11:59:20] <IchGuckLive> the vnew 3printers are boosting the manafacturing
[11:59:36] <jdh> the package unit woudl be nice for compact installs.
[11:59:42] <IchGuckLive> Connor: agree 100%
[12:04:06] <jthornton> seems like a lot of folks have problems getting a G540 to work
[12:08:42] <archivist> some of the breakout boards have compatibility problems that noobs may not spot
[12:09:55] <archivist> the step from the board I have just been playing with cannot drive the leadshine properly yet the direction pin can
[12:10:14] <jackc_> ive had huge success with the gecko servo drives, i use them on tons of stuff
[12:14:55] <archivist> I was handed one of fleabay 201002312758 to drive the leadshine, I scoped the internal signals in the driver and one of the optos was not being driven hard enough
[12:19:55] <skunkworks> jackc_, once you go closed loop (to linuxcnc) you never want to go back...
[12:20:26] <TekniQue> what's the go-to hardware solution for doing closed loop drive with linuxcnc?
[12:20:28] <skunkworks> heh
[12:20:29] <skunkworks> http://groups.yahoo.com/neo/groups/mach1mach2cnc/conversations/messages/142689
[12:21:39] <IchGuckLive> TekniQue: 7i77
[12:21:52] <jackc_> skunkworks: im sure thats true, cost- and time- dependant
[12:22:40] <TekniQue> IchGuckLive: who makes those?
[12:23:25] <TekniQue> ah, mesa
[12:23:29] <skunkworks> I like mesa and amc drives..
[12:24:02] <TekniQue> I assume I need some pciexpress card to go with that
[12:24:17] <TekniQue> or what
[12:24:21] <skunkworks> 5i25
[12:25:06] <skunkworks> the host, daughter and cable kit is about 239 iirc
[12:25:48] <TekniQue> aye, good price
[12:26:46] <skunkworks> very good for what you get - and very expandable
[12:27:11] <TekniQue> I want to go servo on my next project
[12:27:17] <TekniQue> no more driving steppers with parallel port
[12:33:53] <IchGuckLive> TekniQue: the 7i76 is a bunch better or the 7i43
[12:33:59] <IchGuckLive> then parport
[12:37:21] <IchGuckLive> hi flughafen how is the weather delay
[12:40:14] <asah> yay!!! the maho moves!
[12:40:25] <IchGuckLive> Good
[12:40:44] <IchGuckLive> Maho 600
[12:40:50] <asah> 400E
[12:40:58] <asah> damn estop chain!!!
[12:41:15] <IchGuckLive> best to go via halui
[12:41:17] <asah> got my first axis jogging a few min ago...
[12:41:24] <skunkworks> Yay!
[12:41:36] <skunkworks> asah, but linux is hard!
[12:41:39] <skunkworks> ;)
[12:41:44] <asah> ha. right.
[12:41:45] <archivist> that happy feeling when stuff starts to move
[12:41:50] <asah> impossible as milicron says
[12:42:17] <asah> well to be fair, I have been using linux for 15+ years.
[12:42:18] <asah> =)
[12:42:27] <skunkworks> heh
[12:42:43] <IchGuckLive> asah: will you make a howto
[12:43:10] <asah> but getting the io working, and the analog out going was really just hooking it up to the mesa boards
[12:43:25] <asah> and poking with hal
[12:43:37] <asah> turns out the schematics have the outputs all off by one on the ribbon cable.
[12:43:45] <asah> so that was the first issue.
[12:43:50] <asah> (the maho schematics)
[12:44:24] <asah> IchGuckLive: I would love to. Ill post it to the fix it maho thread on practical machinist.
[12:44:46] <IchGuckLive> thanks
[12:44:59] <jdh> aren't all gecko servo drives step/dir?
[12:47:03] <skunkworks> yes
[12:51:08] <jdh> seems almost, but not quite, pointless.
[12:56:42] <TekniQue> IchGuckLive: yeah it doesn't take sophisticated hardware to improve upon the parport
[12:56:58] <TekniQue> but the parport proved to be a very good entry level solution for me
[12:57:14] <TekniQue> to get to know CNC programming and such
[12:57:20] <IchGuckLive> ti76 has lots of IO 48
[12:57:48] <TekniQue> with minimal cost
[12:59:55] <IchGuckLive> minimal is a nother Exponder card to parport 8USD
[13:00:08] <IchGuckLive> to get 13 I
[13:00:33] <TekniQue> my current machine only uses 4 outputs and a couple of inputs
[13:03:08] <IchGuckLive> i think the cnc will boost up after cristmas when all the folks got there 3D printer
[13:04:00] <Connor> Anyone ever think that the acronym CNC is out dated ?
[13:04:04] <TekniQue> I want to equip myself with a 3D printer
[13:04:29] <TekniQue> but I have no interest in printing and using extruded plastic parts
[13:04:45] <IchGuckLive> Connor: it willbe mind controlled
[13:04:46] <TekniQue> what I want to do is make molds for casting aluminium
[13:05:00] <IchGuckLive> Connor: like a replikator
[13:05:36] <IchGuckLive> TekniQue: there is a good TV show on the internet
[13:05:56] <IchGuckLive> TekniQue: they make inlays in a endlos printer 8 at the time
[13:06:24] <jdh> I would like a 3d printer that did Al, Ti, SS.
[13:06:57] <Connor> More to the point.. I think the N in cNc is outdated.. numerical ?? Come on.. that's so.. OLD..
[13:07:06] <archivist> I wand a gold bullion printer
[13:07:23] <Connor> Platinum printer.
[13:09:53] <TekniQue> IchGuckLive: remember what it was called?
[13:09:54] <IchGuckLive> TekniQue: http://www.3sat.de/mediathek/?mode=play&obj=39875 at 20:-22 you can slide forward quixk
[13:10:04] <IchGuckLive> ;-)
[13:11:00] <IchGuckLive> at 23:30 Biggest 3D perinter of the world
[13:11:06] <IchGuckLive> you can bay
[13:11:10] <IchGuckLive> buy
[13:12:04] <TekniQue> I just think the current generation low cost 3d printers (plastic extruders) are toys
[13:12:37] <TekniQue> although they may have their use
[13:12:52] <IchGuckLive> you can get powder printers for less then 3K USD
[13:13:06] <IchGuckLive> Z-corperation
[13:13:55] <IchGuckLive> also for 4K in color it hardens the powder then prints a outside color line
[13:14:19] <jdh> I would rather have a laser cutter/engraver.
[13:15:06] <jdh> they have been printing some mock-ups for tooling here with a cube extruder thingie. They actually seem useful for that.
[13:15:21] <IchGuckLive> http://3dcorp.ru/ckfinder/images/3dcorp_ruZprinter%20450%201.jpg
[13:15:48] <TekniQue> very nice
[13:16:12] <DaViruz_> since i found out how simple and cheap it is to order good 3d prints all the interest i might have had in getting a printer disappeared
[13:17:01] <IchGuckLive> DaViruz_: agree the 3D printing shops are growing like mashrooms
[13:17:42] <IchGuckLive> and the benefit goes to Microsoft Xbox Kinetic
[13:18:04] <IchGuckLive> lots of people are warking around others to sculp themsellf
[13:18:11] <DaViruz_> granted i don't need a whole lot of 3d prints. if i did it might be another story
[13:19:00] <IchGuckLive> 10 Jars ago o my Nimitz Carrier scale it woudt be the first item i bought but i made all of plywood
[13:19:30] <IchGuckLive> oh my eng today is wors so i might considder to go to bed
[13:20:01] <IchGuckLive> BYE folks and keep on Xmas is nearing
[13:23:44] <TekniQue> what I want to cast is 2 stroke engine cylinders
[13:24:27] <archivist> machine from solid
[13:24:29] <TekniQue> it would be wondeful to be able to print them in wax or similar thermally vanishable material and do lost wax casting
[13:25:00] <TekniQue> it'd take a 5 or 6 axis machine to machine them from solid
[13:25:08] <TekniQue> the transfer ports are a complex shape
[13:26:48] <flughafen> does any german in here know what bondo is called/sold as in germany?
[13:28:40] <kengu> i am not german but is this the bondo, http://en.wikipedia.org/wiki/Bondo_%28putty%29
[13:29:16] <flughafen> yes kengu
[13:29:56] <TekniQue> I think spachtelmasse would be the generic term for it
[13:30:47] <flughafen> thanks TekniQue
[13:31:28] <flughafen> haha http://the-deli-garage.de/shopware.php?sViewport=detail&sArticle=20
[13:31:43] <TekniQue> haha
[13:33:22] <pcw_home> spackle must be from the same root word
[13:34:10] <flughafen> yeha
[14:25:31] <Loetmichel> soo, FEIERABEND!
[14:35:22] <jdh> that's what I was thinking.
[15:23:55] <Loetmichel> jdh: was only 13 hrs work today.. and tomorrow will definetly be _much_ longer.
[15:24:38] <Loetmichel> ... and i borke my e-cig 2 minutes before leaving the company, had fallen out of the shirt pocket onto the floor at cleanup :-(
[15:27:27] <rob_h> any one in the UK want a cheap CNC , http://www.ebay.co.uk/itm/Chiron-FZ-12W-CNC-Machining-Centre-Fanuc-O-M-Control-Spares-or-Repairs-/321276614233?pt=UK_BOI_Metalworking_Milling_Welding_Metalworking_Supplies_ET&hash=item4acd941659
[15:39:48] <kengu> uuh
[15:51:12] <andypugh> That's not very cheap.
[15:56:23] <CaptHindsight> archivist: have any experience with the Tektronix TDS784D 1GHz scopes?
[15:58:43] <CaptHindsight> http://www.tek.com/datasheet/tds784d
[16:03:54] <cradek> cool, it has crt-emulation
[16:06:04] <CaptHindsight> snazzy
[16:34:21] <Deejay> gn8
[16:56:02] <Spida> anybody here in/near germany with a mill/plasma/waterjet that is able to cut 3mm sheet steel?
[16:56:35] <Spida> I have a small project...
[16:56:55] <micges> where are you?
[16:57:14] <Spida> germany, aachen
[16:58:40] <Spida> I need two steel stripes in the general area of 40 by 500 mm, with 4 holes and two bends
[17:58:38] <JT-Shop> come by the shop and I'll make them for you
[17:58:49] <JT-Shop> I'm in swamp east Missouri
[18:02:18] <kengu> how does one machine bends with plasma?
[18:03:02] <kengu> i hear the boys did cut some 4mm steel with the plasma here. but yeah, not in germany
[18:08:05] <karmicthreat2> So I have an analog servo amp I want to test. Can I put 5v on a single ended input on the amp to move the motor or do I need to put a 10K resistor in there?
[18:13:13] <andypugh> The input resistance of the analogue input pin should be self limiting for current.
[18:13:44] <andypugh> Otherwise it would pull down the control voltage, and that would be silly.
[18:16:57] <PCW> a battery an a 1K resistor is good (in case you connect to the wrong place)
[18:21:45] <Mr_Mayhem> Heh, I had the same question for an open collector output on my VFD. (Not an input) It does not source current; it sinks, so I had to put field voltage to pull it up, so I used a 10k resistor to be sure not to fry something when it shunts to ground when on. The signal is spindle-at-speed output from VFD.
[18:23:29] <Mr_Mayhem> Everything works, so I guess it's right. No smoke at least.
[18:32:59] <JT-Shop> http://www.youtube.com/watch?v=m_WRFJwGsbY
[18:37:40] <Jymmm> Alright, I got two cans of ibm 8493001 for sale
[18:43:28] <Mr_Mayhem> MSDS for IBM 8493001 Tape Transport Cleaner looks promising: "Lightheadness Dizzyness, Giddiness, incoordination..." but also "nau, vomit, drows, rash. Naa, I'm good.
[18:51:51] <MacGalempsy> good evening
[18:52:03] <MacGalempsy> to all that is evening, and good day to the rest
[18:54:45] <Mr_Mayhem> Electrostatic linear stepper and multi-phase motors. Research, Univesity of Tokyo. One big stacked motor did about 70 pounds of force, not too shabby for electrostatic design. Videos are fun to see but are quicktime and grainy. I play them with VLC media player. http://www.aml.t.u-tokyo.ac.jp/research/es_motor/es_motor_e.html
[18:56:54] <Mr_Mayhem> This one is neat too, but runs in a vacuum and has brushes. http://www.shinsei-motor.com/English/techno/
[19:00:07] <CHNCguy> hey hey :)
[19:12:43] <Mr_Mayhem> hey
[19:13:59] <Mr_Mayhem> Any progress with your retrofit? I think you were gonna test the motor drives next.
[19:37:12] <CHNCguy> hey mayhem
[19:37:34] <CHNCguy> yup just poutting everything back together, currently about to re turcite the saddle
[19:37:53] <CHNCguy> and next gonna re blue the ballscrew cover then put motors on
[19:38:03] <CHNCguy> I still am stuck trying to get the features to work
[19:38:20] <CHNCguy> http://www.youtube.com/watch?v=fkOJhT69WEc
[19:38:37] <CHNCguy> did u see this cool lathe features?
[19:58:41] <MacGalempsy> Mr_Mayhem: me?
[20:20:16] <Valen> hey archivist you around?
[21:08:53] <ries> CNC
[21:09:13] <Tom_itx> nc
[21:10:04] <ries> wanted to page CHNguy, but I mis-typed :s
[21:17:20] <archivist> Valen, well past my bedtime !
[21:17:26] <Mr_Mayhem> CNCguy: I have not looked at those lathe features yet, looks like they are the kind of features that make use of encoder closed loop design.
[21:18:08] <ries> Mr_Mayhem: they look very nice
[21:18:37] <Valen> we were after some clock gears in brass, and i figured, hey i know a guy who does that exact thing!
[21:19:06] <Mr_Mayhem> Hey archivist, you said earlier that steppers are not the future, you got me wondering what other ideas are floating around for future motion control.
[21:19:20] <Valen> SERVO!
[21:19:24] <archivist> servos
[21:19:28] <Valen> or linear motors if your keen ;->
[21:19:34] <Valen> (cyclical tech right?)
[21:19:58] <ries> steppers if you need something cheap, unless servo's become affordable :D
[21:20:06] <Valen> they are coming down
[21:20:26] <Valen> you can get 750W AC servos with drives for like $400 or so an axis as i recall
[21:20:54] <Connor> One thing about servos.. is tuning the PID and Closed loop
[21:21:18] <Valen> so archivist, want to make me some gears? ;->
[21:21:30] <Valen> big chunky ones
[21:21:34] <ries> I tend to see if you go pro, take servo... lot's of hobbyiests or some wood working type machines can get away with steppers..
[21:21:50] <Valen> 1.2mm brass up to 60-80mm dia
[21:22:20] <Connor> Steppers have their place.
[21:22:22] <archivist> Valen, mebe but you have the technology too and there is postage
[21:22:46] <Valen> to do it properly we would need 4th axis,
[21:23:22] <ries> night
[21:23:43] <Valen> I mean we can do it, but you already do do it ;->
[21:23:51] <archivist> bit thin for that diameter
[21:24:31] <Valen> yeah, that is a concern
[21:24:57] <Valen> but we do already have brass in that size which was the reasoning behind that ;->
[21:25:04] <archivist> I have seen some warping after cutting
[21:25:07] <Connor> Wouldn't it be better to make the gear thicker then face it down to 1.2mm ?
[21:25:30] <Connor> after the teeth are cut?
[21:26:12] <Valen> I didn't think that'd be an issue in brass
[21:26:23] <Valen> see thats why I want to talk to you ;->
[21:27:12] <Valen> 3mm would look better
[21:27:29] <Valen> put a little radius on the edge of the gears
[21:29:01] <Mr_Mayhem> What are the gears to be used for? Just curious.
[21:29:46] <archivist> crossed out or plain
[21:31:18] <Valen> crossed out meaning spokes cut?
[21:31:49] <Valen> spokes would be nice but worst case we can cut those, centring on those wont matter much
[21:31:51] <archivist> yes
[21:32:06] <Valen> its going to be electrically driven but off batteries
[21:33:04] <Valen> so no particular accuracy requirement, but low friction is good
[21:35:39] <archivist> at this size (dia/thickness) mounting and arbour size get "interesting" so drilling some holes and screwing them to a plate to make a lot more rigid
[21:36:10] <archivist> but where and how have to be in mind of spokes
[22:11:05] <Valen> better get going or all the shops will be shut, later all
[23:04:41] <MacGalempsy> what a lift! http://www.flickr.com/photos/58181938@N03/11445258955/