#linuxcnc | Logs for 2015-12-22

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[00:19:33] <MattoMatic> those chinese spindle/motor on claim a bottom speed of 2000rpm in the ebay ad. Doesn't that make it pretty useless for metalwork?
[00:30:26] <Contract_Pilot> Our supplier, the manufacturer also cooperate with TORMACH directly, they have agreement on XK7120, the manufacturer can only provide to TORMACH all over the world.
[00:30:55] <Contract_Pilot> Well next trip to china will solve that obsitcal.
[00:37:09] <os1r1s> Anyone know if its the step or dir pin on a mesa 7i76 which can be reconfigured to PWM?
[00:53:21] <Contract_Pilot> Do not think so.
[01:47:24] <archivist> MattoMatic, high speed is used with small endmills on metal
[01:56:21] <Jymmm> archivist: You have any "basic" info I could read on boilers and the like by chance?
[01:56:34] <Contract_Pilot> Back
[01:57:01] <Contract_Pilot> any one else have a 7I76 mesancard for sale? n
[01:57:26] <archivist> Jymmm, what type of boiler
[01:58:49] <archivist> domestic, traction engine,power station
[01:58:55] <archivist> nuclear
[01:58:56] <Jymmm> archivist: Fundamentals basically, like for a radiator heating system. (I'm still on the kick of a "packable" hot water generator)
[01:59:26] <Jymmm> archivist: electricity generator that is
[02:00:00] <archivist> stop dreaming, damned silly
[02:00:35] <archivist> the basics, most efficiency needs very high pressures and temperatures
[02:00:40] <Jymmm> archivist: If you are really against it, I won't bug you about it no more. But I really am determined on this.
[02:00:45] <archivist> booooom
[02:01:40] <archivist> just too heavy and uneconomic
[02:02:00] <Jymmm> I already have a small oil cooler to use as well
[02:02:25] <archivist> not designed for the pressure you need, effin dangerous
[02:02:59] <Jymmm> archivist: So, the main issue is it being a "closed" system?
[02:03:04] <archivist> read up on flash boilers
[02:03:22] <archivist> no the main issue is pressure
[02:03:59] <archivist> steam loco was only about 5% efficient
[02:04:38] <archivist> a power station with all the economics condensation etc manages around 30%
[02:04:39] <Jymmm> per BTU of coal/wood?
[02:04:53] <archivist> yes
[02:05:52] <Jymmm> Ok. In this case, the fire already exists. either it also generates some/any electricity or it doesn't. so not a big issue
[02:07:03] <archivist> leaning a boiler against a small fire will get enough to light an led possibly
[02:07:34] <archivist> far less effort to carry a battery
[02:08:46] <Jymmm> The battery is dead and needs to be recharged and it's winter .
[02:08:52] <Jymmm> archivist: https://www.youtube.com/watch?v=nAORPy4J6j8
[02:09:15] <archivist> you should be carrying enough batteries!
[02:09:29] <Jymmm> archivist: Like that, but a coil shoved into the coals of a campfire
[02:10:01] <archivist> that is a version of a flash boiler
[02:10:42] <archivist> but the pressure needs a pump into the coil
[02:10:57] <Jymmm> check valve
[02:11:02] <archivist> that is a plain heater
[02:11:08] <archivist> no real pressure
[02:11:27] <Jymmm> Ever take apart a coffee maker?
[02:11:36] <archivist> you need to work against the pressure the engine needs
[02:12:36] <archivist> I see you dont realise the problem of continuous water supply to the coil under pressure at the rate it is converted to steam for the engine
[02:12:53] <archivist> look how a steam car works
[02:14:33] <archivist> your coil has to survive a few hundred psi to get much out of an engine
[02:14:53] <Jymmm> Ever take apart a coffee maker?
[02:15:03] <archivist> the engine to use that steam will be heavy
[02:15:28] <archivist> a coffee maker funs with no sensible pressure!!!!!
[02:15:33] <archivist> runs
[02:16:04] <Jymmm> But, it does "pump" (move) water
[02:16:13] <archivist> bugger all
[02:16:19] <archivist> a cupful
[02:16:35] <archivist> not enough energy to charge a battery
[02:16:57] <archivist> scale up and try to carry it
[02:17:31] <archivist> and make it safe, boiler explosions are really not funny
[02:18:02] <Jymmm> archivist: https://www.youtube.com/watch?v=RgRT6WAStaE
[02:19:01] <Jymmm> That's all I want to do/turn.
[02:19:25] <archivist> the forces are high
[02:19:58] <Jymmm> but not very fast
[02:20:11] <archivist> he obviously struggled to turn that in that vid
[02:20:35] <Jymmm> but he did so, and I'd guess it was putting out 10A or so
[02:20:42] <archivist> you are not understanding the forces needed
[02:21:19] <Jymmm> I know, thats why I asked if there was some basics I could read up on
[02:22:06] <Jymmm> some numbers I could play with, etc
[02:23:01] <archivist> learn about flash boilers for 200 psi
[02:23:38] <archivist> find an engine that can use that (100lb in weight)
[02:23:59] <archivist> get about a 1hp out of it
[02:24:32] <archivist> add generator get around 80% of the energy you put in
[02:24:49] <Deejay> moin
[02:24:59] <archivist> 300lb to backpack
[02:25:48] <archivist> the engine also has to pump water into the coil
[02:28:00] <archivist> so you have weight of coil, pipe, pump, engine, generator
[02:32:17] <MattoMatic> how efficient is a thermocouple? I'm thinking bimetallic fire grate and supercaps
[02:32:41] <archivist> not very and the tips burn out
[02:32:53] <Jymmm> and you need a LOT of them
[02:32:54] <archivist> see thermopile generator
[02:33:29] <MattoMatic> OK, supercaps and nylon trousers. charge as you hike
[02:33:42] <Jymmm> MattoMatic: DIY https://www.youtube.com/watch?v=gdzRktn7j3A
[02:34:33] <MattoMatic> neat :) 250mV handy
[02:35:05] <archivist> one fails and its open circuit and dead
[02:35:08] <MattoMatic> at least you could store it all in one supercap
[02:35:59] <MattoMatic> a tiny solar panel sems to be effective to keep supercaps topped up
[02:36:26] <archivist> easier to carry extra batteries
[02:36:32] <MattoMatic> if you want amps instead of amp-hours
[02:36:52] <MattoMatic> one spot weld to free yourself from the bear trap
[02:37:17] <MattoMatic> ah wilderness
[02:37:25] * MattoMatic city boy
[02:42:13] <MattoMatic> so, there's no point suggesting a fly cutter to someone with a chinese spindle that won't go lower than 2krpm reliably?
[02:43:05] <archivist> you need some grunt for slow speed flycutting cast iron
[02:44:07] <MattoMatic> arr. AFAICS, you need to gear those motors down, so there's no point paying for the 4 bearings and the collet chuck
[02:44:29] <MattoMatic> do the pulleys and spindle first, worry about VFD later
[02:44:59] <archivist> I belt drive from a 1425 rpm induction motor
[02:45:24] <archivist> I use a vfd on it to vary its speed
[02:45:47] <MattoMatic> just like the lathe. I should borrow the lathes when I want to mill, it wouldn't be hard to remount
[02:45:56] <Jymmm> Interesting https://www.youtube.com/watch?v=JQUY_bs59a4
[02:46:23] <archivist> MattoMatic, my mill is built with a lathe headstock as its spindle
[02:47:55] <Jymmm> Ok, where my linuxcnc thermocouple making machine?
[02:48:09] <MattoMatic> I've started making plywood V pulleys and I have fresh 4 hole bearings
[02:48:42] <archivist> wooden machine and metal cutting in the same sentence?
[02:48:52] <MattoMatic> fraid so
[02:49:39] <MattoMatic> I'll try and find steel for the section between the bearings, but that's not looking hopeful atm
[02:50:27] <MattoMatic> meh, I'll buy that much steel mail order
[02:51:28] <MattoMatic> and a chinese straight shank ER collet
[02:52:33] <MattoMatic> plywood V pulleys can last quite well, I've heard
[07:13:54] <Tom_itx> JT-Shop, you get the probe routines figured out?
[07:15:18] <jthornton> too early for him but I did probe a clothes pin last night
[07:16:01] <jthornton> can't home the BP for some reason it throws a bunch of sserial errors after contacting the home switch
[07:16:31] <Tom_itx> try debounce?
[07:16:42] <Tom_itx> i had to add that to mine before it would be quiet
[07:17:13] <jthornton> did it throw sserial errors?
[07:17:35] <Tom_itx> i don't recall what errors now but even jogging the machine would trip it sometimes
[07:17:43] <Tom_itx> they're cheap microswitches
[07:18:02] <jthornton> I don't have that problem and they worked in the past for years
[07:18:21] <Tom_itx> so did everything else. but you've changed software now
[07:18:52] <Tom_itx> may not be related but easy to try
[07:19:09] <jthornton> I'm sure I don't have a debounce problem
[07:19:28] <jthornton> the switches are industrial grade
[07:19:40] <Tom_itx> i figured they were
[07:20:24] <Tom_itx> look at your switch signal in halscope
[07:20:36] <jthornton> it was an Anilam converstion before I converted it to emc
[07:20:51] <jthornton> good idea, the scope is sitting next to the BP right now
[07:32:06] <jthornton> see you out in the shop in a bit
[07:32:49] <Tom_itx> headin out.. check back later
[07:55:10] <JT-Shop> hmmm the Z which homes first uses two micro switches and the cable is not shielded
[07:58:41] <archivist_herron> ew
[07:59:58] <archivist_herron> i would be expecting poor homing if it was noise though
[08:01:10] <JT-Shop> I hooked the scope to the limit switch and there is some noise when not doing anything as soon as the servo starts the noise increases
[08:02:57] <JT-Shop> the first error is Failed to set register P0x0101 to 0x0064 (100) Connection timed out
[08:04:20] <archivist_herron> scope the serial lines if you can
[08:05:32] <JT-Shop> when I turn the machine on the 24v gets real noisy
[08:05:51] <JT-Shop> I don't see a way to connect to them
[08:06:08] <ReadError> has anyone extended the user defined mcodes past 199 ?
[08:06:27] <ReadError> was just wondering if its a fairly trivial change or more involved
[08:12:05] <archivist_herron> JT-Shop, be aware that ground loops in the scope ground can also throw you
[08:12:30] <JT-Shop> so many unknowns
[08:20:16] <archivist_herron> it can be a bit of a nightmare, have to go mobile now
[08:31:44] <Jymmm> MattoMatic: Thermoelectric Power Generation On Wood Stove - https://www.youtube.com/watch?v=QKaO3l7iwEA
[08:33:56] <Jymmm> I sorta kinda wish I had one of those "ducted" wood stoves
[08:35:38] <Jymmm> JT-Shop: What is being so sensative to noise? And why now?
[08:40:45] <Jymmm> HAHAHA love the name... http://www.amazon.com/dp/B00MXUHHGK
[08:42:06] <JT-Shop> 2.7
[08:42:33] <Jymmm> ?
[08:43:15] <Jymmm> JT-Shop: What is being sensative? mesa card? controller? vfd? drivers?
[08:49:33] <JT-Shop> hm2
[09:00:00] <JT-Shop> hm2 has a buglet that makes it go wonky if it gets a sserial error
[09:16:38] <lair82> Good Morning guys, has anyone tried to use G43.1 ?
[09:19:02] <cradek> having a problem?
[09:20:31] <cradek> hm I think the docs for g43.1 are totally wrong
[09:22:30] <lair82> Well, not sure really, we tried it yesterday, and it doesn't appear to do what it says it is supposed to, or maybe it does and it isn't making sense to us.
[09:22:55] <cradek> what are you trying to do?
[09:24:20] <lair82> if you do a G43.1 Z 0.250 is it supposed to add/subtract that from the current loaded tool data, or does it disregard the tool table data and only use what you give it with the command?
[09:25:19] <cradek> g43.2 adds the given values to the existing offset. g43.1 replaces the tool offset with the given values. the g43.1 docs are wrong.
[09:25:47] <lair82> We were a little afraid of it after we saw the relative z position changing as much as it did when we issue this command from MDI, Ahhh, this makes sense then
[09:26:06] <cradek> looks like maybe you want http://www.linuxcnc.org/docs/html/gcode/g-code.html#gcode:g43.2
[09:26:58] <lair82> we have been using your g43.2, and it is working as intended, but we figured we would give g43.1 a whirl, and realized real quick that was not what we were expecting
[09:27:15] <JT-Shop> rut row
[09:27:53] <cradek> hi, JT-Shop :-)
[09:29:10] <JT-Shop> offsetting should be replacing
[09:32:16] <cradek> while you're in there, it might be nice to explicitly say that neither g43.1 nor g43.2 changes the tool table
[09:32:29] <cradek> well I guess no g43* command does, so maybe it's not necessary to state
[09:32:45] <cradek> thanks for fixing
[09:32:58] <JT-Shop> yea that's a good idea to say that
[10:24:04] <Sync> zeeshan|2: do you have experience in ams 2488 type 2 ti anodizing?
[10:32:26] <FinboySlick> Jymmm: You noticed the 'Frequently Bought Together' link below those 'No Cry' gloves?
[10:34:13] <Jymmm> FinboySlick: Heh, those are some scry shit to use!
[10:34:42] <FinboySlick> Jymmm: I'm not sure the gloves would save you either.
[10:49:22] <os1r1s> Tom_itx You have recompiled bitfiles for your mesa cards before, rigt?
[10:49:24] <os1r1s> right
[12:40:40] <Tom_itx> os1r1s, yes
[12:44:50] <Tom_itx> JT-Shop, did poking around uncover anything suspicious?
[13:15:12] <archivist> JT-Shop, now Im back home, you can use your scope A+B /A-B to see what is induced on a particular wire chan 1 at one end, chan 2 at the other
[13:16:01] <archivist> this is in the presence of any noise in the scope ground
[13:16:43] <archivist> methinks waiting for a filter is best
[13:18:22] <Tom_itx> might fix things but this exposes vulnerable spots
[13:18:39] <Tom_itx> ie unshielded home switch wiring
[13:19:56] <archivist> he did spot some unshielded earlier
[13:20:08] <Tom_itx> i read that
[13:21:05] <JT-Shop> been digging in the mud lol
[13:21:15] <Tom_itx> he's likely not gonna find one really noisy spot but a bunch of little ones that add up excluding the vfd
[13:21:30] <Tom_itx> JT-Shop, reverting back to your childhood?
[13:22:32] <JT-Shop> trying to get a wood rack built
[13:22:46] <Tom_itx> this dang bug i got is forcing me to take a nap
[13:22:47] <JT-Shop> in this photo http://gnipsel.com/images/bp-knee-mill/bpel01.jpg
[13:23:15] <JT-Shop> the blue thing and the black square thing is the DC power supply. Is there a way to imporove it?
[13:23:26] <JT-Shop> I hate being sick
[13:23:53] <JT-Shop> it reads 170vdc across the two terminals on the blue cap
[13:24:07] <Tom_itx> the resistor across the cap is to bleed it down on poweroff?
[13:25:48] <Tom_itx> you could add a couple smallish caps to the big one to help filter out some of the high frequencies
[13:26:37] <Tom_itx> i used a bunch of smaller caps on mine, not for that but because i got them cheap surplus but it was a bonus feature
[13:27:10] <Tom_itx> the filter you got coming may solve your problems though
[13:27:24] <Tom_itx> i'd give that a try before you rip the pannel apart
[13:28:19] <archivist> I presume the boards below that are the servo cards
[13:28:32] <JT-Shop> yes they are the axis servo drives
[13:28:42] * JT-Shop takes a monkey pickle break
[13:28:53] <archivist> I bet they have some decoupling on anyway
[13:29:17] <Tom_itx> what are those 3 boards below the cap?
[13:29:39] <Tom_itx> duh, pays to read the scroll
[13:29:51] <archivist> :)
[13:29:53] <Tom_itx> was blocked by my brouser temporarily
[13:30:03] <JT-Shop> Tom_itx: the only thing that will solve my problem is a bug fix for 2.7 or the 7I77ISOL galvanic isolator
[13:30:44] <JT-Shop> that is on order...
[13:30:45] <archivist> no transmitted noise should also fix it
[13:30:52] <JT-Shop> yes
[13:31:22] <archivist> this is one of those things where belt and braces apply
[13:31:24] <Tom_itx> easier said than done but true
[13:32:10] <TAPit> Our first cut with a Routech 250 running LinuxCNC: https://www.youtube.com/watch?v=Z22tj5ih4wI
[13:33:23] <archivist> another happy bunny
[13:34:43] <TAPit> Kittens and puppies happy or bunny happy, there is a difference yes?
[13:36:30] <TAPit> There is some peripheral equipment that should come on when the machine spindle starts up - vacuum stuff - any recommendations to tie that into linuxcnc? Via the spindle on request?
[13:37:32] <JT-Shop> do that in HAL
[13:37:58] <archivist> you may also want it to run on a little after the cut is finished
[13:38:24] <JT-Shop> in that case do it in ClassicLadder
[13:38:33] <JT-Shop> where you can have an off delay timer
[13:48:23] <TAPit> Ok thanks guys.
[13:52:05] <TAPit> Also - yesterday there was discussion of difference between touch off to tool fixture and touch off to workpiece - did you arrive at a conclusion - touch off to Workpice worked as it was expected to for us while fixture did NOT work as expected.
[13:53:50] <rob_h> well finaly got the machine delivered today and sat into place... now to give it a little clean , put some guards back and hook it up and get it dirty :) http://imagebin.ca/v/2QrGOM0R8tVP
[13:54:00] <rob_h> http://imagebin.ca/v/2QrG007TZBTL
[13:55:36] <cradek> TAPit: I am pretty sure they both work right. if you could tell us more about how your expectations were not met maybe we could offer some advice.
[13:57:52] <TAPit> cradek: I had Touch Off To Fixture set - touched off to the bed of the machine - the X axis, of all things, was off the left hand side of the bed by about 1 foot. I gave up - the cnc operator played with for about a hour using Fixture - and it works as they expect it to. I can ask the cnc operator to try the other but at this point - it is working as they want it to. So I am unsure of what else to add. :)
[13:58:46] <cradek> on a mill it would be very unusual to have an X offset in the tool table at all
[13:59:14] <cradek> maybe on a dual spindle machine, or a probe or camera mounted off to the side of the main spindle
[14:00:35] <cradek> it's hard from this information to guess with 100% certainty what you were doing wrong, but if you touched off a *tool* in X that would surely be a wrong thing to do
[14:00:52] <cradek> (on a lathe you would definitely want to do that sometimes)
[14:01:06] <lair82> Hey Guys, here is what we are setting up now, second job on the machine, there are mounting holes that need to be perpendicular to the taper, around the taper, so mounted the A axis to the corresponding angle. http://postimg.org/image/veju7c3t1/
[14:02:39] <cradek> cool. looks finicky.
[14:02:41] <lair82> A big Thank You to all you guys that have helped along the way to make this machine come to fruition, It took quite a while, and quite a few off the wall questions, and requirements, but she's running now. Thanks
[14:02:55] <cradek> yay!
[14:03:05] <cradek> you obviously need a 5 axis machine next
[14:03:24] <archivist> and then a
[14:04:01] <archivist> I think rob_h needs a larger shed too
[14:04:07] <lair82> Quite Chris, you to archivist, I think this thing took 10 years off of me
[14:04:23] <cradek> well the next one will only take 6 years
[14:05:12] <rob_h> its ok archivist they even give you a nice tool rack to put all the holders,.. saves on floor space then.. http://imagebin.ca/v/2QrGBYLckLVI
[14:05:22] <rob_h> shame its missing the extra two racks i guess
[14:06:23] <archivist> you said you were running out of space when you got the sliding head!
[14:06:35] <rob_h> i know but oh well
[14:06:48] <archivist> that had to be 4 -10 times the floor space :)
[14:06:59] <rob_h> we did move 2 machins out for this one and put them in a new shed lo
[14:07:09] <rob_h> yea 5mx3m
[14:08:12] <archivist> I had no space then a CMM followed me home, I know the problem :)
[14:09:48] <rob_h> yea kinda like this guy told us a price we realy could not say no too we was only looking for a twin pallet vertical to replace some other machines with.
[14:10:22] <archivist> damned bargains
[14:15:32] <JT-Shop> rob_h: nice
[14:17:00] <rob_h> i do have the bad job of cleaning the coolant tank
[14:17:25] <JT-Shop> I need to clean the CHNC tank too
[14:18:41] <rob_h> yea since we change to fuchs oils our coolant life has been realy good here. iv not cleaned a tank out now for 2 years only topped it back up
[14:19:06] <rob_h> we did get some oil skimmers too as coolant was lasting so well so plenty of heating oil now too :)
[14:19:47] <JT-Shop> win win for you then
[14:21:06] <Roguish> JT: is your website hosted remote? or on one of your own computers?
[14:24:03] <JT-Shop> webhost4life
[14:28:39] <JT-Shop> would this be of any help on my power supply? http://4.bp.blogspot.com/-YagmnljOoVE/VS-TOebZenI/AAAAAAAAAeo/Oa1rpz1J8oM/s1600/schematic.jpg
[14:29:09] <Jymmm> Y FLux capacitor?
[14:30:48] <Jymmm> Many have a CL filter in them http://www.ebay.com/itm/250V-AC-Power-Line-Signal-Phase-Noise-EMI-Filter-Switch-Suppressor-HA32L-20A-New-/380905940894
[14:31:52] <archivist> JT-Shop, that is probably what is in the vfd filter
[14:32:11] <Jymmm> See schematic here http://i.ebayimg.com/images/g/udUAAOxy7vJTdb9Q/s-l1600.jpg
[14:32:22] <archivist> may have more in it for improved spec
[14:32:52] <Jymmm> note the inductors in that EMI filter
[14:33:41] <JT-Shop> archivist: I have the problem with sserial com errors even with the VFD unplugged
[14:34:03] <Jymmm> on 2.6 as well?
[14:34:32] <JT-Shop> no
[14:34:51] <Jymmm> Wait till the bug is patched?
[14:43:24] <os1r1s> Tom_itx Can I literally make any output a PWM generator?
[14:44:03] <archivist> define any
[14:44:30] <os1r1s> archivist Well, I need two PWM generators on a 7i76
[14:44:45] <os1r1s> In addition to the 5 step/dir pins
[14:44:53] <DaViruz> any: used to refer to one or some of a thing or number of things, no matter how much or how many.
[14:44:57] <DaViruz> sorry.
[14:45:04] <DaViruz> couldn't resist
[14:46:48] <archivist> I bet the answer is yes, but how....read a manual or mod the fpga code
[14:52:35] <os1r1s> archivist I am going to try and do it once the ISE finishes downloading, but I figured someone may have tried. The 7i76 has a ton of extra inputs/outputs that it would be a shame if I could use a couple as PWM generators.
[14:52:58] <JT-Shop> try searching the forum
[14:53:12] <archivist> not read the manual myself
[14:53:39] <floppydiskph> Os1: speed might be an issue. If u have a 5i25 or 6i25, u might pull those off the 2nd parport plug. Will take some setup.
[14:55:16] <archivist> ? fpga is faster
[14:58:32] <os1r1s> floppydiskph I'm already using both ports, so I can't. But I do know thats an option. I could always do a software pwmgen in linuxcnc
[14:58:46] <PCW> Yeah if you need 2 PWM outputs you probably need to use the second connector
[14:58:48] <PCW> (Unless they are very slow) You can get 1 PWM out of the 7I76 by using the RS422 expansion port TX output for PWM
[14:59:29] <os1r1s> PCW I just need a 50hz for a chargepump and another 50 hz for a VFD control
[14:59:43] <os1r1s> PCW I think that is pretty slow ...
[15:00:45] <PCW> you could do that with field I/O but low res (might be ok if you can make a 5 KHz or so servo thread work)
[15:01:19] <PCW> so roughly 1% resolution at 50 Hz
[15:02:12] <PCW> whats on the second 5i25/6i25 connector?
[15:05:10] <PCW> I know a 5 KHz servo thread will work on reasonably fast MBs
[15:26:35] <os1r1s> PCW I have a mill on the first connector and a lathe on the second connector.
[15:26:52] <os1r1s> PCW I would get another 5i25/6i25, but you said that was dicey to get working
[15:32:19] <duc> PCW: does the 7i77 need a source for 10v power used for the servo drives or is it pulled from the 24v incoming power on vfield
[15:41:31] <Magnifikus> https://www.dropbox.com/s/e678ykuqlrf6to4/2015-12-22%2020.07.14.jpg?dl=0 first parts out of my raspberry pi2 + spartan3 mill :)
[15:42:40] <Magnifikus> but the pi2 gets slow if the program has more than 300k lines :/
[15:45:33] <JT-Shop> duc: you need 5v and 24v for the 7i77
[15:46:16] <XXCoder> Magnifikus: raspberry pi controlled cnc?
[15:46:30] <duc> JT-Shop: that's what I thought but was being careful so I don't blow up the 7i77 or my servo drives
[15:46:44] <Magnifikus> yep
[15:46:51] <XXCoder> nice
[15:47:13] <Magnifikus> pi2 with machinekit -> spi -> spartan3 -> tmc5130A drivers @2amp and 256 µSteps
[15:47:34] <Magnifikus> and an old isel
[15:48:03] <Magnifikus> just our 8mm flat end mill died for that :/
[15:48:09] <Magnifikus> 1 of 4 teeth left
[15:49:36] <Magnifikus> but that was not the cnc fault :)
[15:49:50] <PCW> +-10 come from the 5V supply
[15:50:00] <PCW> (on a 7I77)
[15:50:22] <duc> Is there enough power from the 5i25 to supply it
[15:52:01] <PCW> In general its better to supply the 7I77 5V locally (since it may supply multiple encoders so can have considerable load)
[15:53:07] <duc> Ok I may to purchase another power supply later on once I'm done testing one drive
[15:54:17] <PCW> Yeah, you can usually get away with 1 or 2 axis (as long as the encoder aren't so old as to have incandescent lights)
[15:55:46] <duc> Ok
[15:56:16] <duc> Manual was a little lite on a describition when it came to operation
[16:00:43] <duc> Last question, my drives require 24v supplied to the i/o then use a a ground to activate. On the 7i77 Ena I would run enan+ to the input and enan- to control power ground?
[16:13:35] <FinboySlick> Magnifikus: You wrote the fpga code?
[16:29:15] <PCW> duc: yes, for sinking type enables ENA- --> GND ENA+ --> DRIVE ENA
[16:32:36] <duc> Ok thats
[16:38:05] <andypugh> Is there any internationally preferred wire colour for 24V control circuits?
[16:39:04] <andypugh> PC PSUs seem to have orange for 3.3V, red for 5V, Yellow for 12V, so I feel I should avoid those.
[16:42:54] <Tom_itx> blue is pretty
[16:43:05] <Tom_itx> green could be mistaken for earth
[16:43:08] <andypugh> Blue is euro-neutral though.
[16:43:25] <Tom_itx> purple
[16:43:34] <andypugh> PC standby power…
[16:43:35] <JT-Shop> most eu stuff I've worked on uses blue/brown for dc
[16:44:09] <andypugh> Yes, I settled on brown, and pink
[16:45:22] <Tom_itx> makes me want neopolitan ice cream
[16:46:13] <andypugh> I had to resort to a rather mad setup to machine the motor mounting face: https://picasaweb.google.com/108164504656404380542/Holbrook#6231236737028424114
[16:46:57] <Tom_itx> should stay put
[16:47:26] <andypugh> Not the best extension thingy, it had about 3mm run-out…
[16:47:39] <Tom_itx> the box iron make alot of noise while machining?
[16:47:54] <andypugh> Sometimes, and sometimes not.
[16:48:22] <andypugh> The next job is to machine the bearing seats.
[16:48:54] <Tom_itx> what was wrong with the old castings?
[16:49:19] <JT-Shop> what are the castings for?
[16:53:13] <andypugh> The old castings are full of the old gears.
[16:54:36] <Tom_itx> you gonna make new gears too?
[16:57:03] <andypugh> https://picasaweb.google.com/108164504656404380542/Holbrook#6231239637322371106
[16:57:17] <andypugh> No, I am replacing all the gears with a servo motor.
[16:57:32] <Tom_itx> hmm
[16:57:40] <andypugh> Machining that bearing housing will be fun.
[16:58:02] <andypugh> One will need to be back-bored…
[16:58:09] <Tom_itx> horizontal as well?
[16:58:26] <andypugh> Yes, so seeing what I am doing will be super-hard.
[16:58:36] <andypugh> And I don’t know how I will measure it, either.
[16:58:53] <andypugh> Apparently I like a challenge.
[16:59:04] <Tom_itx> we knew that already
[16:59:19] <Tom_itx> inside mic might work if you had one
[16:59:27] <Tom_itx> but probably not the best way
[16:59:56] <andypugh> I think it will have to be a telescoping gauge, measured in-situ
[17:00:08] <Tom_itx> machine a screw inside a screw with a ball on each end. insert it and lock it in place then pull it out to measure it
[17:00:46] <andypugh> In the CAD picture, I don’t actually want the hole that the leadscrew nut is in to be that big.
[17:00:48] <Tom_itx> or screw inside a shaft
[17:01:49] <andypugh> <ponder> Where the heck are my telescoping bore gauges?
[17:02:09] <Tom_itx> let lcnc probe it?
[17:02:24] <Tom_itx> but then you'd have to retool each time
[17:02:49] <andypugh> I can’t mount the probe in the horizontal spindle anyway
[17:02:50] <Tom_itx> unless you mounted the probe beside the holder
[17:03:14] <Tom_itx> just so it was attached to 'z'
[17:03:18] <andypugh> And I won’t have enough Y-travel to retract the tool.
[17:03:34] <andypugh> (Or Z-travel, as it ought to be called)
[17:05:24] <Tom_itx> make slightly over/undersize plugs so you know when you're getting close then you can move in for the kill with the instruments
[17:06:55] <duc> What's a good output P/R for a servo motor.? I can adjust the yaskawa servo packs. Set at 2048 P/R right now
[17:07:48] <andypugh> As many as you can usefully generate, probably.
[17:07:58] <duc> Mesa 7i77 card
[17:08:30] <duc> The motors have a 20 bit absolute encoders that are converted to incremental in servopack
[17:09:02] <andypugh> Pity you can’t use the absolute data
[17:10:36] <duc> No kidding. If we had a plug in for mechatrolink I might be able to
[17:11:54] <membiblio> duc we are using yaskawa's as well, they are a real work horse :)
[17:12:16] <ReadError> is there a wiki on the various mesa models?
[17:12:18] <andypugh> Are you talking about encoder pulses or position step pulses?
[17:12:29] <ReadError> the site isnt very use friendly in terms of comparing ;/
[17:12:54] <duc> Encoder pulses
[17:13:14] <duc> membiblio: they are probably overkill for a bridgeport boss
[17:13:56] <andypugh> duc: You probably want to keep below 1MHz
[17:14:24] <andypugh> So work out the motor speed at max axis speed, and work back from there.
[17:14:27] <duc> andypugh: which would be what in the end
[17:14:40] <duc> I'll have to see what the mill can do first
[17:14:55] <Contract_Pilot> Why Not... http://www.practicalmachinist.com/vb/machinery-for-sale-or-wanted/wtt-cessna-150m-1976-ifr-skylights-all-logs-cnc-313650/
[17:17:10] <JT-Shop> what does a 150 go for now a days?
[17:24:24] <Contract_Pilot> 24k ish
[17:24:37] <Contract_Pilot> Depending on Equip and Condition.
[17:25:09] <JT-Shop> worth more now than new :)
[17:25:24] <Contract_Pilot> Yep.
[17:25:27] <Contract_Pilot> http://www.ebay.com/itm/252091751178
[17:25:50] <Contract_Pilot> http://www.ebay.com/itm/401000660423
[17:26:06] <Contract_Pilot> and the TL-1's go for about 12K nothing sold in last 90days
[17:26:33] <Contract_Pilot> Next year the 150 will be worth more than both machines.
[17:29:29] <_methods> damn i need to find a tm1 for that price
[17:29:29] <Contract_Pilot> 10 years from now???
[17:29:36] <_methods> i just missed 2 at the last auction
[17:29:40] <Contract_Pilot> Ebay all the time....
[17:29:47] <_methods> some guy bought both at $8700
[17:30:00] <_methods> i didn't think he was going to take both
[17:30:02] <_methods> oops
[17:30:59] <_methods> boss says he'll give me the eztrak if i can find a cheap tm1 to replace it with
[17:31:58] <Contract_Pilot> Yea, some shop owner closing down and intrested in aviation will get a good deal.
[17:34:09] <Contract_Pilot> http://www.ebay.com/itm/Haas-TL-2-CNC-Lathe-/301752904652?hash=item4641dfebcc:g:lQkAAOSwHjNWCS8z
[17:34:18] <Contract_Pilot> TL2 bit larger...
[17:34:22] <Contract_Pilot> 12.5k
[17:36:07] <Contract_Pilot> SL30 14K http://www.ebay.com/itm/Haas-SL-30TB-CNC-Lathe-/281807269591?hash=item419d05aed7%3Ag%3AtDAAAOSw37tV-yDT&nma=true&si=ySyKj5xMkl%252Fdfkcnmakj6dee%252BF8%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
[17:42:57] <_methods> hehe 81 on xmas eve and 80 on xmas
[17:43:16] <_methods> shorts and flip flops baby
[17:46:51] <JT-Shop> Dakgangjeong tonight mmmmm
[17:47:29] <JT-Shop> 닭강정
[17:48:04] <JT-Shop> rain and 50's for us Friday
[18:07:26] <Magnifikus> FinboySlick, yes
[18:07:49] <Magnifikus> https://github.com/magnifikus/TMC5130FPGA/tree/master/fpga/spartan3_ISE
[18:07:52] <Magnifikus> but beta
[18:08:07] <Magnifikus> so i need a mill guru for some advice :)
[18:13:18] <Magnifikus> http://snag.gy/grN1R.jpg stuff like this, taking away ~3mm with a load of 0,8mm
[18:13:56] <Magnifikus> this is with a 8mm 4 flute (bad shape from beginning...) that died
[18:14:43] <Magnifikus> so we are looking for a mill best is flat end for smothing the surfaces that can run with our shitty cnc
[18:14:58] <toastydeath> how big is your machine
[18:15:04] <toastydeath> do you have pictures/what type is it/etc
[18:15:11] <Magnifikus> sec
[18:15:26] <Magnifikus> https://www.dropbox.com/s/wcfmju9mo33mzpp/2015-12-15%2018.44.22.jpg?dl=0
[18:15:30] <Magnifikus> dont laugh
[18:15:39] <toastydeath> do you have to use that toolpath
[18:15:43] <Magnifikus> https://www.dropbox.com/s/rhfggprm12o2mr3/2015-12-22%2020.07.46.jpg?dl=0
[18:16:14] <Magnifikus> it worked best for roughing
[18:16:25] <toastydeath> what kind of bit were you using and what material is this
[18:16:31] <Magnifikus> spindel is 9-25k rpm 850w
[18:16:49] <Magnifikus> thats the question was some hardened stuff 4 flute but its dead anyway
[18:16:59] <Magnifikus> so i need to tell my professor which to get next
[18:17:06] <toastydeath> what mat'l
[18:17:23] <Magnifikus> only alumium
[18:17:34] <Magnifikus> https://www.hoffmann-group.com/DE/de/hom/Monozerspanung/VHM-Fr%C3%A4ser/VHM-Fr%C3%A4ser-DIN-6535-HA-DLC-2-mm-GARANT/p/201270-6 something like this i had i mind
[18:18:00] <Magnifikus> https://www.dropbox.com/s/rhfggprm12o2mr3/2015-12-22%2020.07.46.jpg?dl=0 this is the current project
[18:18:07] <toastydeath> i can't read the language that's in
[18:18:53] <Magnifikus> https://www.hoffmann-group.com/GB/en/houk/Mono-machining/Solid-carbide-milling-cutters/Solid-carbide-slot-drill-DIN-6535-HA-DLC-2-mm-GARANT/p/201270-6
[18:18:54] <Magnifikus> sorry
[18:18:57] <toastydeath> also, does your machine have ballscrews? what type of drive is it
[18:19:07] <Magnifikus> yep
[18:19:11] <toastydeath> k
[18:19:37] <Magnifikus> its pretty "strong" and works well upto 1800mm/min
[18:20:24] <Magnifikus> https://www.dropbox.com/s/e678ykuqlrf6to4/2015-12-22%2020.07.14.jpg?dl=0 here with fixture
[18:20:28] <toastydeath> what I'll recommend is this: rough the part out with a very simple concentric, expanding circles. Each time you step the diameter up, the step increase should be about 10% of the diamter of the endmill
[18:20:52] <toastydeath> you should be climb milling, not conventional milling
[18:20:59] <toastydeath> it is easier on the cutter
[18:21:04] <toastydeath> (if you aren't already)
[18:21:07] <Magnifikus> that adaptive clearing stuff
[18:21:20] <Magnifikus> yep that worked better than taking only thin layers
[18:21:39] <toastydeath> don't get too insane with the depth of cut but it doesn't matter a whole lot
[18:21:52] <toastydeath> you should be using a 2 flute, high speed steel endmill
[18:21:56] <toastydeath> do not use carbide for this
[18:22:07] <Magnifikus> so the hss stuff?
[18:22:12] <toastydeath> yes
[18:22:33] <Magnifikus> https://www.hoffmann-group.com/GB/en/houk/Mono-machining/HSS-milling-cutters/Slot-drill-HSS-PM-TiAlN-2-mm-GARANT/p/191050-6
[18:23:08] <toastydeath> yeah
[18:23:11] <toastydeath> don't worry about the coating
[18:23:17] <toastydeath> plain HSS will work just peachy
[18:23:53] <Magnifikus> our strategy is a fixture table we face every time so its known depth
[18:24:03] <Magnifikus> faced stock from one side
[18:24:20] <Magnifikus> then fixed on the table, roughed with the big tool
[18:24:23] <toastydeath> also, chuck the biggest endmill you can
[18:24:32] <Magnifikus> then faced with the big tool
[18:24:36] <Magnifikus> so the height is known
[18:24:51] <Magnifikus> then switched to 3mm single flute and did the contours
[18:24:56] <toastydeath> what's the maximum diameter endmill you can hold in that spindle?
[18:25:02] <Magnifikus> x/y is still the same and height is not so important
[18:25:14] <Magnifikus> we got a 8mm "clamp"
[18:25:37] <toastydeath> your fixturing/workholding doesn't really matter here, it's not what's going to give you problems
[18:26:11] <toastydeath> 8mm maximium diameter?
[18:26:19] <Magnifikus> yep
[18:26:26] <toastydeath> then get a very short 8mm endmill
[18:26:28] <toastydeath> 2 flute, hss
[18:26:31] <Magnifikus> https://www.hoffmann-group.com/GB/en/houk/Mono-machining/HSS-milling-cutters/Slot-drill-HSS-Co8-TiAlN-2-mm-HOLEX/p/191070-8
[18:26:46] <toastydeath> if you can't find a shorter endmill, then yeah go with that
[18:27:22] <Magnifikus> for the contour we use the small one anyway, yep short and big
[18:27:56] <toastydeath> keep the spindle as slow as it will go, so 900 rpm
[18:28:00] <toastydeath> you should not have a problem with the speed
[18:28:02] <toastydeath> er
[18:28:05] <toastydeath> 9000 rpm
[18:28:39] <Magnifikus> thats alot of info :)
[18:28:49] <toastydeath> roughing should always be done with the biggest endmill you can practically use
[18:29:14] <toastydeath> shortest length, biggest diameter
[18:30:07] <toastydeath> if you have a small machine, take a small cut. big machine, take a big cut
[18:30:28] <enleth> Oh dead, last Bridgeport control problems fixed - there had to be a cold solder joint somewhere on the relay board, as the problem went away after I soldered test wires to some pads, planning to attach a scope at normally unreachable points. Before that I could actually see that one of the relays is not firing even though it worked when I powered it directly from a lab power supply.
[18:30:30] <toastydeath> the endmill should be as large as practical in both cases because it is *much* more rigid and able to do more useful things
[18:31:13] <enleth> *Oh dear
[18:32:01] <Magnifikus> also better facing picture :)
[18:32:27] <toastydeath> you're *still* going to have problems because your machine can't go slow enough for the most important part
[18:32:42] <Magnifikus> the spindle yeah
[18:32:45] <toastydeath> so you're going to burn out endmills constantly
[18:33:11] <Magnifikus> trying to get a kress that goes down to 5k
[18:33:11] <toastydeath> to be super honest, if you can remove that spindle and put a low-rpm drill motor on it, you'll be better off
[18:33:22] <toastydeath> like, 500-1000 rpm
[18:33:30] <enleth> Magnifikus: what wattage is that spindle?
[18:33:35] <Magnifikus> 850
[18:34:17] <enleth> Magnifikus: Proxxon makes a very cheap, AFAIR 350W, DC spindle that goes down to 300rpm or so
[18:34:23] <enleth> standard 43mm mount
[18:35:01] <toastydeath> that would be much better, even thought you're going to strain it at 350w
[18:35:05] <enleth> it may be a bit underpowered but I think it would be handy for you to have it just for the odd low-speed job
[18:35:25] <enleth> the build quality is really nice, solid bearings and such
[18:35:41] <toastydeath> you really, really need to get the spindle speed down if possible
[18:35:59] <toastydeath> because you need to advance an 8mm cutter about .25mm per revolution
[18:36:04] <toastydeath> 8mm two flute
[18:36:15] <toastydeath> and that's a very conservative, low number
[18:36:20] <enleth> Magnifikus: doesn't take any collets bigger than 6mm though, unless you adapt something to the outside thread that normally accepts drill chucks
[18:37:15] <enleth> I guess it should be doable, in principle, to make/modify an ER collet holder to screw onto that and still be fairly coaxial with the spindle
[18:37:58] <enleth> Magnifikus: the part number is BFW 40/E
[18:38:03] <Magnifikus> sec
[18:38:48] <Magnifikus> thats 250W
[18:39:30] <Magnifikus> for that price i would rather take a kress for 180 that can go down to 5k
[18:39:41] <Magnifikus> the most stuff we do is small mills like 3mm
[18:39:52] <Magnifikus> its just this project for our radar feed horn
[18:40:01] <enleth> that's still crazy fast for roughing
[18:41:38] <toastydeath> imo unless you actually need very tiny features, it's not good to go with small endmills
[18:41:46] <Magnifikus> yeah i see with 9k its 220 vc where 120 is advised
[18:42:57] <toastydeath> people try to go smaller because they think their machine is small
[18:43:03] <toastydeath> but the tool does not determine how much force the machine sees
[18:43:05] <toastydeath> the cut does
[18:45:39] <Magnifikus> its a cnc we found in the basement :)
[18:45:44] <enleth> and actually, unless it's some weird ass engineered carbide tool, it will cut even at *very* low speeds - see broaching and other low speed cutting processes
[18:46:13] <toastydeath> high rpm spindles are for wood, generally, not metal
[18:46:29] <toastydeath> you do not need or want a high rpm spindle in almost all normal machining situations
[18:46:36] <zeeshan|2> enleth are you sure you are not confusing feed and speed
[18:46:37] <Magnifikus> yeah and good low rpm is expensive
[18:46:46] <zeeshan|2> :P
[18:47:02] <enleth> zeeshan|2: yes, I do mean the effective linear cutting speed
[18:48:13] <enleth> Magnifikus: do they even make low speed high torque 43mm mount spindles?
[18:48:37] <Magnifikus> the plate the spindle is mounted on
[18:48:40] <Magnifikus> i made myself
[18:48:41] <Magnifikus> so
[18:48:58] <Magnifikus> :)
[18:49:39] <toastydeath> Magnifikus, is there anyone you can go to for money?
[18:49:43] <toastydeath> in the school?
[18:49:46] <toastydeath> http://ugracnc.com/CNC-SPINDLES/Air-Cooled-CNC-Spindle-1.5-kW-220-V.html
[18:50:18] <Magnifikus> hehe a dream :)
[18:50:41] <Magnifikus> you know we are a high frequency lab with 10k a year
[18:50:56] <Magnifikus> to buy equipment, finance student projects etc :/
[18:51:29] <toastydeath> you may want to work with your professor to see if you can get a small grant
[18:51:40] <enleth> to be honest, I'd probably try making/buying an actual bare *spindle* on bearing blocks that would fit this machine, and mount a generic AC motor to the side with belt transmission
[18:51:55] <toastydeath> enleth, i second that
[18:52:32] <Magnifikus> i dont want to see the machine crash down everytime i pull the plug
[18:52:35] <Magnifikus> :D
[18:52:44] <enleth> actually the fact that those Kress products are called "spindles" is a part of the problem
[18:52:54] <Magnifikus> yeah i agree
[18:53:04] <enleth> they're a compact-spindle-and-motor-combo
[18:53:17] <enleth> however that should be actually called
[18:53:19] <toastydeath> if you want to make a spindle they're not super hard
[18:53:33] <toastydeath> two wheel bearings from your local auto parts store
[18:53:36] <enleth> well that givea me an idea
[18:53:38] <Magnifikus> so i can take a 6mm 2flute to stay in vc (or near) or take a 8mm and use double vc to see a tool burn every x days
[18:53:57] <Magnifikus> hehe
[18:53:59] <enleth> why not make a spindle from a burned out Kress?
[18:54:01] <toastydeath> Magnifikus, you won't burn the tool out on aluminum
[18:54:04] <enleth> you should be able to get one cheap
[18:54:14] <toastydeath> what's burning your tools out is the fact you can't get anywhere near the correct feed rate
[18:54:29] <Magnifikus> i pushed it to 1800mm/min
[18:54:46] <toastydeath> yeah, and that's nowhere near fast enough
[18:55:20] <toastydeath> for that spindle speed
[18:55:26] <FinboySlick> Magnifikus: Basically, you want the chip to grab as much as possible without clogging or sticking (due to heat).
[18:55:29] <enleth> get a dud Kress, disassemble it, rip out the widings completely, reassemble and possibly rebalance, figure out some way to mount a toothed belt pulley
[18:56:01] <enleth> the body should provide enough space to mount a low-speed AC motor on it
[18:56:14] <Magnifikus> thats a great project for next year :)
[18:56:20] <Magnifikus> but i have to live with what i got atm
[18:56:24] <Magnifikus> http://snag.gy/0LYjb.jpg
[18:56:29] <FinboySlick> Magnifikus: If you can't slow down enough, a single-flute endmill might give you much nicer results too.
[18:56:39] <FinboySlick> (I meant slow down the rpm)
[18:56:46] <Magnifikus> thats for 2 flute 8mm
[18:57:10] <enleth> Magnifikus: ^ what he said
[18:57:15] <FinboySlick> I'd say you want a bigger feed per tooth.
[18:58:08] <Magnifikus> would eat 0,08mm easy with the machine
[18:58:21] <FinboySlick> Hog, get the chips out (recutting is pretty bad with aluminium). then do a finish pass.
[18:58:28] <Magnifikus> so feedrate of 1400
[19:00:27] <Magnifikus> https://www.hoffmann-group.com/GB/en/houk/Mono-machining/HSS-milling-cutters/Slot-drill-TiAlN-3X60-mm-GARANT/p/190730-8X80 single flute is so "fragile" :)
[19:00:58] <enleth> toastydeath: oh, you said earlier that coating isn't that important - I noticed however that aluminum really likes to stick to one uncoated HSS endmill I'm using and doesn't do that as much with coated endmills. Both 2-flute 10mm, very similar cuts. Any ideas/things to check for?
[19:00:59] <toastydeath> yes but it will get you enough feed rate so that you don't burn the cutter up
[19:01:44] <toastydeath> enleth, it makes a small difference but the actual surface finish shouldn't change much
[19:01:48] <enleth> more than once I had to take a brass rod and a hammer and chip off the buildup in the flutes
[19:02:14] <FinboySlick> Magnifikus: Some cotings like to stick to aluminium more too.
[19:02:23] <toastydeath> if you are going Quite Fast, it does make a difference
[19:02:24] <FinboySlick> *coatings
[19:02:27] <toastydeath> i.e. finish cuts
[19:02:34] <enleth> although it *was* some shitty unspecified hardware store aluminum, so there's that
[19:02:48] <toastydeath> if you're moving over 700-800 sfm on the tool, the coatings start to come into play
[19:03:00] <toastydeath> but an actual polished endmill will do better than most coatings
[19:03:03] <Magnifikus> i know that problem with unspecified aluminium
[19:03:04] <enleth> I think it wasn't a problem with a piece of 6061
[19:03:07] <Magnifikus> our lab is full with that
[19:03:19] <Magnifikus> basicly i dont know the alloy of a single piece...
[19:03:41] <toastydeath> one of the only actually useful coatings for aluminum is zirconium nitride
[19:04:01] <toastydeath> otherwise you're usually better off with a polished endmill
[19:04:25] <toastydeath> what the coatings do and why you're seeing less weld-up is because the aluminum just has some surface adhesion, it's not really pressure welding to the edge
[19:04:50] <toastydeath> the coatings smooth the microscopic surface finish on most HSS and so you wind up with a semi-polished bit
[19:05:02] <toastydeath> less surface area for the aluminum to stick to
[19:05:23] <enleth> "some", yeah. It took some serious hammering to get that crap off the mill.
[19:05:47] <toastydeath> well, actual built up edge is like friction welding and actually permiates the surface
[19:06:05] <toastydeath> which cannot be hammered off at all because it's a weld
[19:06:34] <toastydeath> either way, polished endmills
[19:06:52] <enleth> when it did fall off, there wasn't any visible change to the HSS surface, though
[19:07:08] <toastydeath> *all of that said* if the coatings are working for you at your price point, stick to it
[19:07:20] <enleth> > stick to it
[19:07:24] <enleth> I see what you did there
[19:07:25] <toastydeath> badum tsh
[19:08:04] <toastydeath> my actual advice, even with normal ratty endmills
[19:08:07] <toastydeath> is *go faster*
[19:08:13] <toastydeath> for the finish pass
[19:08:16] <toastydeath> 1500, 2000 sfm
[19:08:40] <toastydeath> the old values in machinery's handbook don't really apply anymore to aluminum with the current state of metallurgy
[19:08:56] <toastydeath> at that point the aluminum comes off semi-molten and does not stick at all
[19:09:17] <toastydeath> counterintuitively, the part stays cooler as well
[19:10:04] <toastydeath> esp if you're not cutting a lot, the aluminum just doesn't get hot enough to dull the endmill
[19:10:17] <toastydeath> so on a finish pass there's no real thermal risk
[19:10:27] <Roguish> cooling and lubricant really help too.
[19:10:34] <toastydeath> zero cooling
[19:10:38] <toastydeath> you want the chips molten
[19:10:48] <toastydeath> if you cool them down they stick to the endmill
[19:10:55] <enleth> speaking of semi-molten aluminum, I was reviving an old East German foundry pyrometer today, had to heat up some scrap aluminum with a torch to check if it's still up to specs
[19:11:12] <enleth> it was fun to poke holes in the scrap with a screwdriver
[19:11:42] <enleth> it felt like cold plasticine
[19:12:01] <toastydeath> hahah
[19:12:11] <Magnifikus> toastydeath, thanks for all the advice :)
[19:12:17] <toastydeath> no probs homie
[19:12:19] <Magnifikus> will try the 8mm 2 flute lets see
[19:12:32] <toastydeath> you're gonna burn any bit you use up tho
[19:12:37] <toastydeath> unless you get that speed down
[19:12:44] <enleth> but the torch wasn't beefy enough, couldn't make the scrap glow
[19:12:50] <Magnifikus> yeah but if it lasts some days
[19:12:51] <toastydeath> the aluminum acts as basically a sandpaper pad
[19:12:55] <Magnifikus> we are not mass production
[19:13:28] <Magnifikus> the 3mm single flute from ebay works nicely
[19:13:43] <Magnifikus> running at 18k rpm cut all day
[19:13:43] <enleth> so I had to settle for lightbulbs, as the pyrometer is completely passive and gives bogus readings for things that aren't hot enough to give off light
[19:13:51] <Magnifikus> still sharp as a knife :)
[19:14:07] <Magnifikus> but you cant rough with that
[19:14:09] <Magnifikus> or face
[19:14:54] <toastydeath> sure you can
[19:15:32] <toastydeath> given how fast you have to run it, it'll probably work out better than a 2 flute
[19:15:34] <Magnifikus> yeah even in our lab the day has 24 hours ;)
[19:15:55] <Magnifikus> hmmm
[19:16:19] <toastydeath> seriously, you should be taking 0,10 to 0,15mm of material *per tooth*
[19:16:22] <toastydeath> per revolution
[19:16:26] <toastydeath> minimum
[19:16:44] <toastydeath> once you start getting under that, tool life goes way down and your surface finish starts to get ratty
[19:16:58] <toastydeath> the aluminum tears and bends out of the way rather than cutting
[19:17:09] <toastydeath> and the shittier/gummier the alloy is, the worse it gets
[19:17:53] <Magnifikus> https://www.hoffmann-group.com/GB/en/houk/Mono-machining/HSS-milling-cutters/Slot-drill-TiAlN-3X60-mm-GARANT/p/190730-8X80
[19:18:00] <Magnifikus> so you would prefer this
[19:18:30] <toastydeath> yeah, looks good
[19:19:20] <toastydeath> see if you can find a shorter one
[19:21:13] <Magnifikus> hmm only in carbide
[19:21:34] <toastydeath> nope, don't get carbide. carbide bits do not like machines that vibrate.
[19:21:45] <toastydeath> even bridgeports are really really hard on carbide tools
[19:24:11] <toastydeath> as an aside, they *do* make grades of carbide that are very tough, but they don't make endmills out of it because it can't be sharpened very much
[19:24:29] <toastydeath> those grades almost exclusively go in very large tools when you're going to be take 10, 20 hp cuts
[19:24:33] <toastydeath> *taking
[19:24:40] <toastydeath> and are priced to match
[19:33:18] <Magnifikus> hehe
[19:58:48] <duc> PCW: what steps are need to flash a 5i25 to go from a 7i76 to 7i77
[20:01:09] <PCW> fetch 5i25_7i77x2.bit from 5i25.zip
[20:01:10] <PCW> get mesaflash
[20:01:12] <PCW> ( sudo apt-get install mesaflash )
[20:01:13] <PCW> then
[20:01:15] <PCW> mesaflash --device 5i25 --write 5i25_7i77x2.bit
[20:01:16] <PCW> mesaflash --device 5i25 --reload
[20:02:11] <PCW> ( the reload command reloads the FPGA from the flash chip so you dont have to power cycle )
[20:02:20] <duc> Ok
[20:03:12] <duc> Have the files but was unsure which configuration but that straighten it out
[20:10:54] <duc> PCW: how long does the process normally take? Seems to be hung on erasing sector 0 for boot block
[20:11:42] <PCW> it should only take a few seconds
[20:12:04] <duc> Hmmm
[20:12:20] <PCW> sounds like a PCI access issue
[20:13:00] <duc> Does it hurt if it doesn't complete
[20:13:13] <PCW> I would try another slot or clean the 5I25 fingers and card slot and try again
[20:13:40] <PCW> probably has no card access
[20:13:48] <PCW> so nothing done
[20:14:21] <duc> Was just running the 7i76 card a couple hours ago with this setup. Only switched cable to the 7i77
[20:15:35] <duc> Rebooting computer then will try again
[20:16:12] <PCW> be careful to match 5I25/remote card power options
[20:16:14] <PCW> Also some BIO'ses are buggy and dont enable card access
[20:16:15] <PCW> I think the hm2 driver enables card access but I dont think mesaflash does
[20:16:48] <PCW> lspci might shed some light on whats going on
[20:16:50] <PCW> _but_ bbl dinner time
[20:17:53] <duc> Reboot worked. Thanks
[20:36:38] <malcom2073_> HAha wow, apparently a 8ft long, 4x4" steel tube is considered ground shippable
[20:37:12] <malcom2073_> At 75lbs, bet that'll piss off the delivery guy
[20:37:24] <malcom2073_> Especially if I order 5 of them in seperate orders
[20:39:02] <malcom2073_> 1/4" wall is still ground shippable, at 96lbs
[20:39:16] <malcom2073_> I'm curious exactly how they'd handle that
[20:47:24] <chupa> Does anyone have a package of linuxcnc for fedora? I dislike Debian based distros. Thanks.
[20:49:29] <duc> I used to receive in truck bumpers and shit. Those guys are in shape
[20:49:51] <enleth> malcom2073_: at least they won't be able to throw it over the fence onto the front porch
[20:50:15] <malcom2073_> enleth: If they do, it may collapse the fench, porch, and or house foundation
[20:50:44] <malcom2073_> It's a shame I need 12ft sections, they're not ground shippable
[21:02:21] <FinboySlick> chupacabra: You'll need a RTAI version of Fedora though.
[21:08:26] <duc> Any reason to use the forward or reverse prohibit on a servo motor for a cnc mill
[21:20:28] <chupacabra> FinboySlick, Yes, I gathered that.
[22:05:56] <os1r1s> Has anyone tested multiple 5i25 or 6i25s in one computer?
[23:36:12] <os1r1s> Anyone have Tom_itx's website?
[23:38:15] <zeeshan|2> http://tom-itx.no-ip.biz:81/~webpage/cnc/3
[23:38:17] <zeeshan|2> http://tom-itx.no-ip.biz:81/~webpage/cnc/
[23:38:30] <os1r1s> zeeshan|2 Thank you
[23:38:59] <zeeshan|2> np
[23:39:27] <zeeshan|2> man i have these retarded
[23:39:34] <zeeshan|2> .080" holes to make in this part
[23:39:42] <zeeshan|2> and they have a tolerance of .001"
[23:39:48] <zeeshan|2> 0 +.001
[23:40:02] <zeeshan|2> i have tooth pick 1/16" end mills
[23:40:05] <zeeshan|2> but they break so easy!
[23:44:57] <Jymmm> try steel instead of toothpicks =)
[23:46:48] <Jymmm> zeeshan|2: http://www.amazon.com/dp/B00H6V17MQ