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[00:00:34] <nathanstenzel> Is this a decent place to talk about physical plans for a CNC?
[00:07:35] <nathanstenzel> hmmm...off to the reprap room. later
[01:46:33] <Loetmichel> mornin'
[03:48:53] <DJ9DJ> moi
[03:49:08] <DJ9DJ> +n ;-)
[05:38:05] <mazafaka1> Wanted to ask you about "cheap stainless steel" What if it lacks some casual for it elements and getting harder from temperature hardening? I last time have broken end mill bits at particular place of the detail. It was heated up to be bent on the rolling press.
[05:40:06] <archivist> breaking and wearing out tooling on stainless is not cheap stainless but cheap tooling
[06:09:21] <jthornton> and or feed and speeds wrong
[06:16:03] <archivist> we had a drill and thread job in stainless some years ago M4 thread in a blind hole, I was getting about 80 done before the tap would need replacement
[06:24:09] <jthornton> did you just drill the hole or was it reamed to size?
[06:27:21] <mazafaka1> no, wait, i need to go. Same speed and feedrate as at other parts of this detail and other details
[06:28:18] <mazafaka1> end mill on 2.5D, just worked on the side of the detail
[06:29:01] <jthornton> are you having the problem at the heated area?
[06:29:05] <mazafaka1> thread bits are not durable at all
[06:29:57] <mazafaka1> yeah, problem was in some area, and I do not know why. Probably the machine was moving the tool abruptly when missed steps
[06:31:01] <mazafaka1> some circuit boards only work when they're bent a little, problems with electronics. But it works at a day and didn't work at calm night
[06:52:26] <jthornton> so how do you guys determine the correct tool height on your lathes with carbide insert tooling?
[07:20:56] <archivist> jthornton, hole was just drilled, I set the height as best I can to be dead on centre
[07:55:57] <rob_h> jthornton, i guess u mean like boring bar... u can use a Vernier Height Gauge on chnc sit it on the bed and then move bar to hight
[08:12:41] <rob_h> all that bar is, is cut down to the center of the bar... which lets u set the distance from slide to l-2a thingie or any other setting device
[08:13:11] <rob_h> i cant rember the hight off top of my head for chnc to tool center
[08:15:22] <oz__> Hello, I've been struggling with a 7i77 since two days and was finally wondering : should the "Enable" pin(s) be wired to allow the "Analog_out" pins to vary ? Thank you
[08:16:09] <jthornton> the enable pins are for enabling the drive
[08:17:08] <oz__> If the drive is always enabled, should these be wired, shorted, disabled ?
[08:17:33] <jthornton> if not used do nothing
[08:18:26] <jthornton> why would your drive be always enabled?
[08:18:39] <jthornton> that is dangerous
[08:30:18] <tjb1> r00t4rd3d: You awake
[08:30:35] <mazafaka1> i thought if some stainless steel is heat hardening
[08:30:49] <DJ9DJ> tjb1, your sentence no verb
[08:31:14] <tjb1> This the english channel?
[08:31:37] <mazafaka1> tjb1: for improving english, there is a ##English
[08:31:54] <tjb1> Sarcasm man.
[08:31:54] <DJ9DJ> hehe
[08:32:00] <mazafaka1> tjb1: what do you mena
[08:32:26] <tjb1> Maybe you should go to ##English
[08:32:47] <skunkworks> in case some missed this...
[08:32:59] <skunkworks> http://www.youtube.com/watch?v=nebJ59TcYlQ
[08:33:20] <DJ9DJ> sorry, did not want to start a dispute ;)
[09:32:34] <mazafaka1> Jymmm: Do you have an odiginal file for this chart? I want to make one for my group on raw vegetarianism
[09:33:22] <Jymmm> BLASPHEMY!
[09:35:59] <mazafaka1> just clean, lovely, sincere, ultimately sexy
[09:36:04] <mazafaka1> :)
[12:49:59] <IchGuckLive> ge B)
[12:50:07] <IchGuckLive> gmagno: :D
[12:52:04] <Aero-Tec> hello
[12:52:25] <IchGuckLive> Aero-Tec: Hi
[12:52:29] <Aero-Tec> what happened yesterday?
[12:52:46] <Aero-Tec> every one just dropped out at the same time
[12:53:00] <Aero-Tec> not everyone, but most everyone
[12:53:18] <IchGuckLive> Aero-Tec: a gate at irc failed
[12:53:29] <IchGuckLive> happens somtime
[12:53:42] <Aero-Tec> ok
[12:53:50] <Connor> It's called a Net Split..
[12:53:52] <Aero-Tec> was just wondering
[12:54:10] <Connor> if TONS of people fall off, it's most likely YOUR IRC server that has issues.
[12:54:57] <gmagno> IchGuckLive, hey :)
[12:55:03] <IchGuckLive> B)
[12:55:04] <L84Supper> IchGuckLive, is the majority of high tech development in Germany just in the south east?
[12:55:32] <IchGuckLive> L84Supper: what you call higtech
[12:55:49] <IchGuckLive> Aitplain North
[12:56:00] <IchGuckLive> Car Middle South
[12:56:07] <IchGuckLive> Solar East
[12:56:41] <IchGuckLive> L84Supper: germany is not that Big
[12:59:14] <L84Supper> IchGuckLive, it's just that we rarely get contact anyone from north of frankfurt
[13:00:16] <IchGuckLive> mashining ?
[13:01:00] <L84Supper> more like controls, components or chemicals
[13:01:15] <IchGuckLive> agree
[13:02:31] <IchGuckLive> it is like the USA we got 16 States internal
[13:06:19] <IchGuckLive> gmagno: did you see the stl outcom of your picture
[13:07:04] <IchGuckLive> gmagno:
http://foengarage.de/mounton.png
[13:12:28] <IchGuckLive> By im off
[13:13:15] <gmagno> :) I saw
[14:29:08] <JT-Shop> cradek: is your touch screen serial or usb?
[14:29:33] <cradek> I have at least one of each
[14:29:55] <JT-Shop> ok, so Ubuntu has a driver for usb then
[14:30:07] <cradek> dude, ask your real question :-)
[14:30:14] <JT-Shop> I couldn't tell much googling
[14:30:41] <JT-Shop> I buying a touch screen and want to have a good idea that it will work :)
[14:30:44] <cradek> yes some of the usb ones work, usually after fiddling
[14:31:02] <cradek> "it's usb" is not enough information to answer that question
[14:31:25] <JT-Shop> my problem is the serial port is being used by the gs2 driver so I can only use usb
[14:31:41] <JT-Shop> looking at planar, and elo
[14:32:03] <cradek> I bet elo are a good bet
[14:32:04] <archivist> the..why not two (or more) serial ports
[14:32:06] <cradek> never heard of planar
[14:32:23] <jdh> I have a pair of planars here
[14:32:35] <JT-Shop> seems to be second most popluar but I just see on this one it is for windows 7 only
[14:33:33] <JT-Shop> http://www.newegg.com/Product/Product.aspx?Item=N82E16824217120
[14:34:35] <JT-Shop> crumb, that done doesn't have vesa mount
[14:36:41] <skunkworks> JT-Shop, 75 mm VESA mount
[14:37:33] <JT-Shop> ah see it now
[14:38:34] <jdh> I have Planar PT19's
[14:38:43] <jdh> they seem to be overly pricey though
[14:40:08] <JT-Shop> like this one?
http://www.newegg.com/Product/Product.aspx?Item=N82E16824016245
[14:41:25] <jdh> says it has unbuntu 6.2 support, surely they still work.
[14:45:55] <jdh> http://www.amazon.com/PLANAR-19IN-TOUCH-1000-1280X1024/dp/B002XJ5W5E
[14:46:22] <JT-Shop> YIKES! they are proud of that one
[14:46:43] <cradek> jeeeez
[14:48:57] <jdh> mine just say PT19 on the front
[14:49:18] <JT-Shop> do they have a model number on the back?
[14:49:38] <Aero-Tec> back, 4 power bump that I know of this morning,
[14:50:06] <jdh> yeah, had to pull the plug. PT1945R-BK
[14:50:25] <jdh> resistive. has that funky Res. screen look. Not bad though
[14:51:37] <JT-Shop> http://www.newegg.com/Product/Product.aspx?Item=N82E16824016245
[14:52:24] <archivist> vertical resolution looks low
[14:53:03] <jdh> mine is running 1280x1024
[14:53:38] <jdh> that newegg description doesn't match this one
[14:54:02] <JT-Shop> newer one I suspect
[14:54:21] <jdh> the newegg one is W, widescreen I guess.
[14:54:37] <JT-Shop> yuk 1366 x 480
[14:54:54] <JT-Shop> archivist: good catch
[14:55:06] <jdh> http://www.planaronline.com/product/?id=997-5971-00
[14:56:16] <jdh> one is currently my 3rd monitor here (mirrors my right monitor) just for app development on a touch screen thing I'm doing.
[14:58:59] <JT-Shop> this one don't look bad except the price
http://www.newegg.com/Product/Product.aspx?Item=N82E16824217138
[15:01:05] <jdh> elo generally plays nicely with linux
[15:15:34] <hdokes> Hey all.... have an opportunity to purchase an Excello 604 cnc mill... anyone know anything about excello and that particular machine?
[15:29:08] <hdokes> hello?
[15:29:55] <micges> hdokes: hi
[15:30:34] <archivist> hdokes, I have lurked in here a number of years, never heard of them till now, I just googled and they were servo so a linuxcnc retrofit should be easy enough
[15:30:58] <archivist> any pictures of it?
[15:31:03] <hdokes> Howdy archivist
[15:31:13] <hdokes> yeah... check this out... bad pic tho..
http://kokomo.craigslist.org/tls/3207947736.html
[15:31:30] <hdokes> I went and looked at it today
[15:32:25] <cradek> wow that looks like a lot of cash for a rusty dead machine
[15:32:34] <hdokes> it's not rusty
[15:32:44] <hdokes> I looked at it on site... it's VERY clean
[15:32:48] <hdokes> and everything moves
[15:33:22] <hdokes> the pic does not do it justice
[15:33:40] <hdokes> it doesn't have your typical 'chuck' on it tho
[15:33:57] <Connor> Godady being down sucks...
[15:34:18] <archivist> tool changer? I found another
http://vancouver.en.craigslist.ca/rch/tls/3224587889.html
[15:35:41] <hdokes> yes... it most likely is a tool changer
[15:37:22] <hdokes> vancover is a bit of a ways to go however on that other one you found...
[15:38:05] <archivist> I wonder if this was the original supplier
http://www.excellotool.com/machinery.php
[15:38:43] <hdokes> archivist.. nope... they were originally a canadian based outfit that went out of business in 1985 apparently
[15:38:56] <archivist> ah ok
[15:39:08] <hdokes> It's my understanding someone else bought the name... but do not mfr these machines any longer
[15:55:04] <JT-Shop> is there a remote estop example that doesn't use classicladder?
[15:56:07] <r00t4rd3d> lol @ godaddy
[15:56:24] <r00t4rd3d> yay for anonymous
[15:56:45] <Connor> r00t4rd3d: WTF ? Does nothing but hurt end users.
[15:57:02] <JT-Shop> I'm so glad I don't use gopappy any more
[15:57:07] <r00t4rd3d> i like sticking it to the man
[15:57:27] <Connor> I use godaddy to register all my domains. But, I don't use their hosting, or their DNS.
[15:57:30] <r00t4rd3d> even if it temporarily hurts the "little guys"
[15:57:36] <Connor> so, I'm up.
[15:58:18] <r00t4rd3d> im not sure if it was/is anony doing it
[15:58:41] <r00t4rd3d> or why they would need to press the big red button
[16:00:51] <r00t4rd3d> seems like they pulled all the secure stuff down
[16:01:02] <Connor> ??
[16:04:42] <DJ9DJ> gn8
[16:13:11] <tjb1> anyone else use cncrouterpart carriages?
[18:31:30] <Aero-Tec> kind of dead
[18:31:37] <Aero-Tec> where is everyone?
[18:39:46] <JT-Shop> I'm right here but I don't count
[18:59:57] <JT-Shop> you gotta love this spammers email address youknowitwasoj@aol.com
[19:33:58] <Aero-Tec> LOL
[19:34:03] <Aero-Tec> that is a good one
[19:34:24] <Aero-Tec> why all the messages?
[19:34:37] <Aero-Tec> guys coming and going
[20:09:47] <jp__> aft
[20:10:14] <jp__> well guess more like evening
[21:02:36] <nathanstenzel> hi
[21:03:32] <nathanstenzel> anyone here ever make a CNC mill?
[21:03:46] <FinboySlick> nathanstenzel: Quite a few actually.
[21:03:57] <FinboySlick> Well, I didn't. I mean quite a few here.
[21:04:29] <Valen> we are making one from the rails up and have converted one
[21:04:29] <nathanstenzel> hmmmm....I wonder how many of them are awake
[21:06:01] <nathanstenzel> what is your opinion on 16 tpi threaded rod for a part for the linear movement parts?
[21:06:14] <Valen> depends what you want to do
[21:07:16] <nathanstenzel> milling of mainly wood and some 3d printing
[21:07:30] <Valen> everything is a trade off
[21:08:01] <skunkworks__> spring loaded plastic nuts...
[21:08:03] <Valen> you need to worry about straightness/wobble, backlash, variance in TPI
[21:08:09] <nathanstenzel> I know the two have totally different needs
[21:08:18] <jdh> and be pretty slow, or get some really speedy motor
[21:08:32] <Valen> how big?
[21:09:10] <nathanstenzel> the rods are 3 foot and 6 foot. 2 of each
[21:09:19] <Valen> that is very long
[21:09:23] <Valen> what dia?
[21:09:39] <nathanstenzel> one sec while I fetch a small one
[21:10:02] * jdh guesses.... 3/8
[21:10:12] <jdh> imagine that thing whipping at 6ft!
[21:10:16] <Valen> wow
[21:10:17] <nathanstenzel> yes, jdh
[21:10:20] <Valen> yeah lol stand back
[21:10:41] <Valen> i mean it'd probably work, but your feed rate is going to be like 100mm/minute
[21:10:44] <Valen> or less
[21:11:03] <Valen> and the flex is going to be *massive*
[21:11:04] <nathanstenzel> mm vs inch?
[21:11:19] <Valen> /25.4 for inches
[21:11:53] <jdh> 3/8-16 might be ok for 1ft? maybe 2.
[21:14:53] <Valen> 6ft I'd look at either a 25mm (1") ball screw with the good end fixings or doing something else, rack and pinion or belt or something
[21:15:36] <jp__> If seen people use 5/8 in a 6 foot length and it whips like a mother @#$$
[21:15:47] <jp__> I've
[21:16:13] <Tom_garage> for what?
[21:16:17] <Tom_garage> damn irc
[21:16:56] <nathanstenzel> hmmmm......100rpm for 16tpi is 6.25 in per minute...
[21:17:35] <jdh> you can get 3/4-6 acme rod pretty cheap
[21:17:48] <Valen> yeah use acme at least
[21:17:54] <nathanstenzel> 400 rpm for 16tpi is 25 in per minute
[21:18:15] <Valen> ballscrews aren't *that* expensive either, take a look at linearmotionbearings2008 on ebay
[21:18:43] <Valen> if the $ is putting you off, look at doing a chain drive or something
[21:19:53] <jp__> Check out Roton ithink they ave all different screws with pricing per/ft for reference.
[21:20:36] <jp__> http://www.roton.com/
[21:22:09] <Valen> http://www.roton.com/Mating_Components.aspx?family=7059305 is what (gut feel) i'd be using
[21:22:19] <Valen> i'd have to look up the speeds though
[21:22:34] <nathanstenzel> I think our definition of cheap is different
[21:22:49] <nathanstenzel> I got these for just $5 each
[21:23:05] <Valen> yeah, but they aren't going to work worth a damn
[21:23:41] <Valen> grab it in the middle and wiggle it in your hand, now imagine its doing that at 1000RPM
[21:24:34] <nathanstenzel> I don't expect them to bear weight. I just expect them to move the load. their ends would be held basically in place (while allowed to spin)
[21:25:04] <jp__> yeah but the middle is going to hump
[21:25:15] <jp__> with the nut at either end
[21:25:35] <nathanstenzel> they are straight
[21:25:40] <Valen> they arent
[21:25:50] <Valen> and it doesn't paticularly matter
[21:25:58] <jp__> not when they start spinning
[21:26:14] <Valen> as the slightest offset caused by the thing pushing on it will off center the center of mass and then you get 1000RPM of whip
[21:26:34] <jp__> and a long boomerang for the kids!!!
[21:27:16] <nathanstenzel> wait....1000rpm?
[21:27:17] <Valen> watch/listen to this
http://www.youtube.com/watch?v=v6Gx4pmKLws
[21:27:54] <nathanstenzel> that is 5.2 feet per minute
[21:28:25] <Valen> thats half of what we rapid at
[21:28:36] <Valen> we cut timber at that speed
[21:31:03] <nathanstenzel> Valen, you have really expensive cutting bits, don't you?
[21:31:21] <Valen> we got 200 carbides from china for like $250
[21:31:24] <Valen> 2-3mm
[21:31:53] <jdh> I'd start off smaller probably.
[21:32:05] <nathanstenzel> is that something you can use on a standard router or drill?
[21:32:41] <Valen> I did wind up sticking one in a dremel and using it to hack up steel when my clutch pedal shit itself
[21:32:57] <Valen> albiet rather slowly
[21:33:23] <jdh> you can get acme cheap.
[21:33:35] <jdh> then you still need some sort of bearings/slides
[21:33:42] <Valen> at least look at acme, or just ditch the whole screw idea
[21:33:58] <nathanstenzel> acme? cheap? define cheap?
[21:34:03] <jdh> $10
[21:34:57] <jdh> http://www.surpluscenter.com/sort.asp?catname=&byKeyword=yes&search=acme%20screw
[21:36:03] <jdh> or ebay, or other diy cnc vendors
[21:38:54] <nathanstenzel> so you mean like this one?
http://www.surpluscenter.com/item.asp?item=1-2983-50-3&catname=
[21:39:22] <jdh> sure, but I wouldn't do 6ft with that either.
[21:40:07] <nathanstenzel> well, I think I might downsize it to 2x4x3
[21:41:37] <nathanstenzel> I have 2 rods to use for the 4ft length
[21:42:59] <nathanstenzel> people have been telling me that I could use the stepper motors from some old scanners, but I think those might be a bit weak for a cnc
[21:44:28] <jp__> skunkworks_: here's the vid
http://www.youtube.com/watch?v=zusAwiSAMEw
[21:45:11] <jp__> gotta figure out how to do a time lapse with the camcorder
[21:47:37] <nathanstenzel> errr....for a cnc miller
[21:48:32] <jp__> Huh?
[21:49:06] <nathanstenzel> I was clarifying my previous statement
[21:49:48] <jp__> ah!
[21:50:12] <nathanstenzel> stepper motors from an old scanner for cnc milling sounds slow
[21:50:33] <jp__> for small benchtop mills some nema23's are fine
[21:51:13] <Tom_itx> i like my 282 in oz alot better than the original 135 in oz for sure
[21:51:21] <Tom_itx> as well as the drivers
[21:53:04] <jp__> really depends on the holding torque of the motor, load transfer ratio of the screw, gear reduction if any and the cutting forces you expect to overcome
[21:58:50] <nathanstenzel> I am about thinking the only way I can do this is how I will do it and worry about how bad I suck later.
[21:59:37] <jp__> You mean learn by doing
[22:00:13] <nathanstenzel> yeah....and probably sucking badly along the way
[22:01:38] <jp__> Nothing wrong with that. I just found out i can go as fast as i want, cause my steppers just cant handle the loads. I tried and i learned from it.
[22:02:36] <nathanstenzel> I have severe doubts about the speed of the motors that I might get to use with this
[22:02:56] <jp__> What do you doubt?
[22:06:26] <jp__> I can tell you this. This is the first stepper machine i have built and i'm impressed with how well they work (given the whole open loop thing). Always used servos
[22:06:27] <nathanstenzel> well, a stepper motor from an old scanner may be slow and weak
[22:07:10] <jp__> you can buy new for about $30 ea for nema 23's
[22:07:22] <Tom_itx> yup
[22:07:30] <Tom_itx> for small machines they work fine
[22:08:01] <nathanstenzel> the motors may be so slow that I might not have to worry about the rod whipping around until I am ready to buy new motors and rods
[22:08:38] <jp__> i just bought 2 spares one 180oz/in and a 260oz/in for under a 100 shipped to canada with a driver
[22:09:28] <nathanstenzel> yeah.....I just wish I knew what I was doing.
[22:09:45] <jp__> thats what were all here for lol
[22:09:50] <nathanstenzel> I am a programmer. I was never all that mechanically inclined
[22:10:16] <jp__> you know how to spell google right?
[22:10:39] <jp__> google knows everything!!!
[22:10:43] <Tom_itx> askirc?
[22:10:50] <nathanstenzel> hehe. you have to be able to understand the stuff you find and not all of it is easy to find
[22:11:50] <nathanstenzel> btw, 1/2"-10 means 1/2" diameter with 10tpi, right?
[22:12:03] <jp__> you would be amazed what you will find and how well some sites are and articles for non-mechanical types. yes it does
[22:12:41] <nathanstenzel> heh. I am cornholio. I need 1/2-10 tpi for my borehole
[22:12:53] <nathanstenzel> ok. really bad joke
[22:12:55] <jp__> ok beavis lol
[22:13:34] <nathanstenzel> lame jokes are a specialty of mine. ;)
[22:14:54] <jp__> Tom_itx: I'm impressed how well this has gone so far. slic3r is pretty good to get you goin.
[22:15:48] <nathanstenzel> hmmmmm.....if I modify some nuts or get one of those teethed wheels that can take a chain so that the nut/wheel moves instead of the rod, should I have to worry about the rod whipping at all?
[22:16:27] <jp__> If you want something you can use for a long time i would
[22:16:50] <jp__> if your going to build 6ft long
[22:17:38] <jp__> at 4ft you will still have to come up in size
[22:17:45] <nathanstenzel> I could mount the rod solid (perhaps weld it to the endpoints and then use a chain to paid up both sides and stick a motor inbetween
[22:18:03] <nathanstenzel> "come up in size"?
[22:19:36] <jp__> Well what size of screw i thought you were talking about 3/8 or something small like that?
[22:19:52] <jp__> originally
[22:20:01] <nathanstenzel> oh. yeah. that seems to be the size
[22:20:22] <jp__> well i would go bigger on a 4ft span
[22:20:26] <nathanstenzel> SWL 1700lb
[22:20:35] <nathanstenzel> does that mean anything to you?
[22:20:44] <jp__> safe working load?
[22:21:13] <jp__> BRB
[22:29:30] <jp__> hey
[22:36:46] <nathanstenzel> so....1700lb for swl sounds strong to me
[22:38:52] <jp__> what size?
[22:39:53] <nathanstenzel> same rod I was talking about before
[22:43:59] <jp__> working load is just one part of the equation
[22:44:09] <jp__> what span?
[22:46:54] <nathanstenzel> 3/8" 16tpi. I have 3ft and 6 ft lengths, but I may make it just 2ftx4ft for the work bed
[22:47:20] <nathanstenzel> those rods are 1700lb SWL
[22:52:05] <jp__> It's just not the load rating the load ratings are just based on static tension and compression. there are also dynamics to consider. thats why valen was guiding you to go bigger. the larger the cross sectional area of the screw the less it will have the tendancy to resonate (shake) over long spans at speed
[22:55:00] <nathanstenzel> I want to try having the thread stationary and spin a threaded sprocket around it to see if I can overcome the resonance thing
[22:55:38] <jp__> i would look at rack and pinion gear then
[22:55:44] <nathanstenzel> I think I would take some old bike parts to get that
[22:56:07] <Jymmm> archivist: JT-Shop easy Rust removal by Electrolysis -
http://www.youtube.com/watch?v=y4yYF8gSHdA&NR=1&feature=endscreen
[22:57:21] <nathanstenzel> wait. rack and pinion as an alternative or an addition?
[22:58:26] <jp__> alternative
[23:00:40] <nathanstenzel> hmmmm..........so many people suggest that.
[23:03:30] <Valen> there is a reason for it nathanstenzel
[23:03:40] <Valen> or just do a chain or belt drive
[23:04:05] <nathanstenzel> I may end up making a few different types of linear actuators to play around with the stuff, but for some stupid reason, stores want to charge you out the arse for things that are made in china and refuse to buy American where it might actually be cheaper than the price they sell for. Damned traitors wanting the massive markup
[23:04:39] <jp__> got it done!!!
[23:04:41] <jp__> https://picasaweb.google.com/103502607515689372041/LinuxcncStuff#5786761211731101506
[23:12:01] <jp__> night all
[23:12:58] <nathanstenzel> what on earth is that?
[23:13:30] <jp__> just a test program i ran for my 3d printer
[23:15:02] <Jymmm> archivist: JT-Shop
http://www.youtube.com/watch?v=AQNvhUYqCkw&feature=player_detailpage#t=629s
[23:29:35] <nathanstenzel> ummmm....if you have a motor on the right and a motor on the left, how do you stop them from mismatching position?
[23:30:27] <nathanstenzel> and do chain drives get resonance too?
[23:35:17] <skorket> has anyone else here got a CNC that etches PCBs?
