#emc | Logs for 2011-01-31

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[01:44:31] <danimal_garage> well just finished my resolver mount. now i just need to find an allen wrench small enough for the shaft coupler so i can mount it up.
[01:46:08] <cradek> one of those .020 allens or whatever the one is right under 1/32?
[01:46:39] <cradek> 025 maybe? don't remember. my biggest set has one of them
[01:49:19] <danimal_garage> yea, and i think the smallest i have is .o5
[01:49:40] <danimal_garage> bastiage. I wonder if home depot has them that small
[01:49:50] <cradek> yeah right
[01:49:57] <danimal_garage> or any place around here open on a Sunday evening
[01:49:59] <cradek> don't you have a real hardware store?
[01:50:09] <cradek> oh right, sunday
[01:50:16] <danimal_garage> yes, but not at 5:30 on a Sunday
[01:50:25] <cradek> I'll fax you mine
[01:50:47] <danimal_garage> thanks, i'll just trim it out with scissors
[01:51:05] <danimal_garage> looks about as thick as paper!
[01:51:45] <danimal_garage> If this actually works, and i make a nice cover for it, i might actually just leave it on there
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[01:52:09] <danimal_garage> there's no chance of the stock cover fitting, but no biggie
[01:52:55] <danimal_garage> the servo will just be 2 inches longer
[01:53:47] <danimal_garage> i cant imagine it not working as long as i get it clocked right
[01:54:24] <danimal_garage> i already know emc reads it, which means the drive reads it
[01:54:41] <cradek> oh you're getting good quadrature out of the drive?
[01:54:46] <cradek> that does seem promising
[01:54:49] <danimal_garage> yes
[01:54:57] <cradek> cool.
[01:55:26] <danimal_garage> i didnt check the scale, but it is the same scale as the lathe, minus the gear reduction
[01:55:39] <cradek> also promising
[01:55:43] <danimal_garage> just a few extra decimal points on the lathe
[01:56:55] <danimal_garage> the lathe is working great still, btw
[01:56:59] <danimal_garage> i love it
[01:57:12] <cradek> neat
[01:57:46] <danimal_garage> i had to tune the servos again, but that was easy
[01:59:07] <danimal_garage> have you built any new machines?
[02:00:50] <cradek> I don't have completed photos, but the last thing I built was a setup for developing/testing gantry style index homing: http://timeguy.com/cradek-files/emc/2010-10-31_17-51-40_109.jpg
[02:01:08] <cradek> it has two leadscrews, servos with index, home switches, indicators to show final gantry alignment
[02:01:18] <danimal_garage> my toolchanger on the mill was acting up, so i ditched all the built in logic boards, replaced it all with SSR's, and put all the logic in classicladder
[02:01:55] <danimal_garage> nice
[02:02:03] <danimal_garage> have you tried it?
[02:02:21] <cradek> yeah it works perfectly, I took it to cnc workshop last time, and didn't work on the project at all
[02:02:41] <cradek> but I have it for whenever I want to work on it. or if someone else does...
[02:03:01] <danimal_garage> cool
[02:03:07] <cradek> http://timeguy.com/cradek-files/emc/2010-10-31_17-52-13_194.jpg
[02:03:57] <danimal_garage> linear rails?
[02:04:26] <cradek> no, delrin sliding on drill rod
[02:04:41] <danimal_garage> ah.
[02:04:50] <cradek> acme nuts pressed into a block of delrin
[02:04:54] <cradek> super simple
[02:05:34] <danimal_garage> cool
[02:05:54] <danimal_garage> i've been so bust lately that i havent had time to tinker with anything
[02:06:11] <danimal_garage> but now i got all those steppers and drives.... i'm sure i'll find a use for them
[02:06:24] <danimal_garage> i'd like to build a desktop mill for engraving
[02:06:33] <danimal_garage> but they're a bit big for that
[02:06:49] <danimal_garage> 1300oz/in
[02:06:52] <cradek> sure is nice to have something small with a fast spindle and no backlash for engraving
[02:07:19] <danimal_garage> yea, i do it on my mill now, but it's a PITA since it's so slow
[02:07:51] <cradek> yeah I feel that way too, and mine's 6000
[02:08:36] <danimal_garage> same here
[02:09:05] <danimal_garage> oh yea... i ditched the variable speed pulley/belt in the Shizuoka too, and made it a fixed ratio
[02:09:20] <danimal_garage> i kicked it up to 6k max rpm instead of 4k
[02:09:29] <cradek> that's a big difference
[02:09:39] <danimal_garage> i figured i ditched all that extra weight, so it'll be ok
[02:10:07] <danimal_garage> so far so good
[02:10:18] <danimal_garage> it's been like 6-7 months
[02:10:33] <danimal_garage> MUCH quieter, and the accel/decell is better
[02:11:37] <danimal_garage> probably dropped 20lbs of rotating weight
[02:11:43] <cradek> heh
[02:12:03] <cradek> varispeed is sure good for what it's good for - but it's nice to be rid of all that mechanism too
[02:12:08] <danimal_garage> yea
[02:12:25] <danimal_garage> it was nice to ditch it on the lathe too
[02:14:00] <danimal_garage> i was able to machine 2 v belt grooves in the spindle's pulley, and then i just made a 4 groove pulley for that jackshaft where the variable belt pulleys were, and i made a pulley for the spindle on the clutch/gearbox
[02:14:46] <danimal_garage> i adjust the tension with the heim joints attached to that that big plate with the motor and gearbox on it.
[02:14:57] <cradek> aha
[02:15:03] <danimal_garage> there's one in each corner
[02:15:12] <cradek> maybe I should do that someday - mine's squeaky and creaky
[02:15:17] <cradek> but ... it works
[02:15:30] <danimal_garage> yea, i only did mine because the upper belt was shot and it slipped
[02:15:57] <danimal_garage> hold on, i'll snap a pic
[02:23:23] <danimal_garage> http://www.homebrewedcomponents.com/lathe1.jpg
[02:23:38] <danimal_garage> http://www.homebrewedcomponents.com/lathe2.jpg
[02:23:44] <danimal_garage> sorry, they're huge
[02:23:59] <cradek> ah! nice
[02:24:14] <cradek> I like the clutch gearbox thing on these
[02:24:20] <danimal_garage> yea, me too
[02:24:38] <cradek> that's a nice adaptation
[02:24:55] <danimal_garage> thanks
[02:25:23] <danimal_garage> i think i would have gone with a gearbelt next time
[02:25:32] <danimal_garage> but this works
[02:25:49] <danimal_garage> i can still make it slip, but it takes a bit
[02:26:19] <danimal_garage> at least i can take a heavy of enough cut not to start titanium fires
[02:26:43] <cradek> heh is that a problem with titanium?
[02:26:49] <cradek> I've never cut the stuff.
[02:27:05] <danimal_garage> yes, if you can't take a heavy enough cut
[02:27:12] <cradek> wow
[02:27:16] <danimal_garage> it rubs too much and wears out the tools really fast
[02:27:29] <danimal_garage> not as bad as mag, but still pretty bad
[02:27:31] <toastydeath> there is a definite minimum depth of cut on titanium
[02:27:44] <toastydeath> and it work hardens very thoroughly
[02:27:44] <danimal_garage> yea
[02:27:50] <danimal_garage> yep
[02:27:57] <danimal_garage> i cut 6al4v
[02:28:04] <danimal_garage> pretty tough stuff
[02:28:36] <danimal_garage> i make the same parts out of 17-4ph and it cuts like aluminum in comparison
[02:28:55] <danimal_garage> (the 17-4 does, i mean)
[02:29:23] <toastydeath> i have very little experience with titanium
[02:30:24] <danimal_garage> i went from killing an edge of a cmng 432, tialn coated, in 3 pars. I just ran 14 parts on a used edge and it's still going. The only change was going from .015" DOC to .04" DOC
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[02:30:43] <danimal_garage> parts*
[02:31:17] <cradek> does it help to vary the doc?
[02:31:54] <danimal_garage> i think just deeper is better
[02:32:12] <pcw_home> I have a 4" diameter x 4" long cylinder of titanium. its weird, looks like stainless steel but ~1/2 the density
[02:32:32] <danimal_garage> if it's 6al4v, i'll buy it from ya :)
[02:33:01] <toastydeath> doc only matters when you get to very small depths
[02:33:10] <danimal_garage> yea
[02:33:21] <toastydeath> Boeing did a few research items on how to cut Ti the most efficiently
[02:33:43] <toastydeath> not sure where those papers are now, but their research is now why you see finishing endmills for Ti that are like, 40-60 flutes on a 1" endmill
[02:33:58] <cradek> heh wow
[02:34:42] <toastydeath> in terms of wear and power/stiffness requirement it's not too much different from stainless, it's just the work harderning is so bad you have to at least take off the hardened layer
[02:35:12] <toastydeath> if you can get under the hard coat with each tooth you'll be fine
[02:35:15] <danimal_garage> in the mill i just use a 4 flute carbide EM with a small corner radius and tialn coating
[02:35:29] <danimal_garage> works ok
[02:36:06] <danimal_garage> i'd be interested in trying different stuff
[02:36:23] <toastydeath> i've not heard too much going on with coating and Ti
[02:37:05] <toastydeath> might want to try a ZrN coating or something, but other than that I can't think of anything to do
[02:37:20] <toastydeath> and even then unless you're trying to do high speed machining I can't see what benefit there'd be
[02:38:57] <danimal_garage> i use that on aluminum, with a high helix 3 flute
[02:39:11] <danimal_garage> the coating helps a lot
[02:39:18] <toastydeath> for Al shit yeah it does
[02:39:23] <danimal_garage> even on ti
[02:39:38] <danimal_garage> trust me, i've tried it without it
[02:39:53] <danimal_garage> i wouldnt spend the extra money if it didnt :)
[02:40:06] <toastydeath> but in Al just about anything non-HSS will work at insane speeds as long as you can keep the chips semifluid until they clear the flutes
[02:40:29] <danimal_garage> yea, unfortunately i'm tapped at 6k rpm
[02:40:46] <danimal_garage> but the high helix allows me to feed a little faster
[02:40:53] <danimal_garage> gets the chips out fast
[02:41:33] <danimal_garage> i gained about 10ipm with a 1/4" EM, pocketing, 1/4" DOC
[02:42:28] <danimal_garage> sorry, not 10ipm.... that was profiling. about 5ipm for pocketing that deep
[02:44:02] <danimal_garage> ok i'm gunna run to home depot to see if i can find an allen wrench. wish me luck
[02:44:09] <danimal_garage> i'm gunna need it!
[02:44:14] <cradek> good luck - yep
[02:44:34] <danimal_garage> hmm i suppose i could grind one on the surface grinder
[02:44:48] <danimal_garage> ehh
[02:45:07] <cradek> before or after driving to home depot?
[02:45:46] <danimal_garage> after. i still need a set screw, and i need to go grocery shopping
[02:48:39] <danimal_garage> pretty sure i saw 4-40 set screws at home depot
[02:49:13] <cradek> can you use a SHCS (that you have an allen wrench for) and get a setscrew later?
[02:50:15] <danimal_garage> yea thats plan b
[02:50:28] <danimal_garage> i actually have an allen wrench for this coupler
[02:51:53] <danimal_garage> the shaft for the resolver is 1/8". I have a coupler for it. The shaft on the motor is 1/4", and i have a coupler for that too. The OD of the 1/8" coupler is 1/4", so i was going to put the smaller coupler inside the bigger one.
[02:52:17] <danimal_garage> kinda ghetto, but it should work since the fit is pretty good
[02:52:36] <danimal_garage> plan be is make a sleeve
[02:52:41] <danimal_garage> B*
[02:52:54] <danimal_garage> which i might do anyways
[02:53:24] <cradek> yeah 'hey look I have a lathe' is a useful scheme sometimes
[02:53:42] <danimal_garage> ha
[02:53:43] <cradek> but you can't bore a 1/8 hole...
[02:53:43] <danimal_garage> hea
[02:53:54] <danimal_garage> i can ream it
[02:54:44] <danimal_garage> yea, i'll do that
[02:55:05] <danimal_garage> bbl, off to get some unstripped set screws and frozen pizza
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[03:43:38] <CHelgesen> Hi all. I'm having trouble with my new 10.04 install on my Hurco. Anyone available for Linux newbie assistance?
[03:47:47] <danimal_garage> amazing, home depot had the tool i needed
[03:48:03] <danimal_garage> it was in a mini screwdriver set
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[03:58:38] <CHelgesen> On 10.04, does anyone know how to create the non-included xorg.conf file? "sudo Xorg -configure" gives errors saying the X server is running.
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[04:18:35] <CHelgesen> OK, I used a different display for the command ("sudo Xorg :1 -configure") and the xorg.conf.new file was generated.
[04:19:40] <CHelgesen> I'm chasing latency problems on an HP P4 SFF system with a Matrox video card.
[04:23:16] <danimal_garage> wish i could help but i'm a newb
[04:23:27] <danimal_garage> is your hyperthreading off?
[04:23:43] <danimal_garage> i heard that can mess with it
[04:27:43] <CHelgesen> Thanks. I'll put that on my list to check. I went through the BIOS but may have missed it if it's there. P4s have HT, IIRC.
[04:28:22] <danimal_garage> yea, turn it off.
[04:29:12] <CHelgesen> The latency numbers look OK until I move windows around when running glxgears (as advised as a stress test) and they explode.
[04:29:16] <danimal_garage> there's something else.... i forgot what it's called, it's like a system management feature, for the fans and such. I guess you can turn that off in bios, and it might help
[04:29:30] <danimal_garage> vid card maybe
[04:29:55] <CHelgesen> It's an older Matrox (G400/450?) that is supposed to be solid.
[04:30:35] <danimal_garage> i dont mean it's bad, but some are weird with linux
[04:30:48] <danimal_garage> i had latency issues, and swapped the vid card and it fixed it
[04:30:55] <CHelgesen> I was going to try the vesa driver if all else fails.
[04:31:08] <danimal_garage> yea, could be the driver too
[04:32:29] <CHelgesen> I was also wondering if Gnome eye candy could be causing trouble but it's set for the basic desktop appearance.
[04:32:51] <danimal_garage> dunno
[04:38:55] <CHelgesen> Going to look at BIOS settings...thx.
[04:39:39] <danimal_garage> no prob
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[14:13:47] <mrsun> when measuring pulleys, where do i measure? .. outer diameter or?
[14:16:50] <atmega> where the belt sits
[14:17:07] <mrsun> so on the belt where it sits in the depth of the groove?
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[14:18:04] <atmega> yes, but depending on why you are measuring, I suppose it could be different.
[14:18:37] <atmega> what kind of belt?
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[14:19:49] <mrsun> V grove i guess its called
[14:21:40] <atmega> there are lots of different V belt cross sections. You have to make sure they are compatible
[14:22:08] <mrsun> v belt cross sections? :/
[14:22:51] <mrsun> i freakin hate humans
[14:22:57] <atmega> "A" belt, "B", "3V", "4L"
[14:22:58] <mrsun> why cant one thing be good enough ?
[14:23:06] <mrsun> why does every single one invent his own standard
[14:23:06] <atmega> perhaps there are metric sizes that make more sense
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[14:45:36] <archivist> ask the maker of the belt , some cords are further out than others
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[15:04:41] <atmega> and the maker of the sheave
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[15:16:52] <kb8wmc> good morning to all
[15:17:04] <skunkworks> Good morning!
[15:17:25] <kb8wmc> how doing today skunkworks
[15:18:36] <skunkworks> great - other than it being monday
[15:18:42] <kb8wmc> aha
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[16:02:41] <cruzin> hi
[16:02:41] <the_wench> hello cruzin, you have a question?
[16:02:58] <cruzin> just watching
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[16:12:20] <danimal_garage> so problemo with the resolver
[16:14:13] <danimal_garage> it seems to work, then it starts changing direction. so it goes from like .001"to .05"and back down to .001" with a full rotation. that is a guestimate on the actual numbers.
[16:20:27] <danimal_garage> any thoughts?
[16:29:23] <SWPadnos> are you saying that it spins a full rotation to get back to 0.001? (+/-1 rev)
[16:30:27] <danimal_garage> yea
[16:30:31] <danimal_garage> more or less
[16:30:51] <danimal_garage> not exactly zero, but it starts going up then it goes back down
[16:31:20] <SWPadnos> that sounds more like an oscillation around the "right" spot ...
[16:32:31] <danimal_garage> this is spinning it by hand
[16:33:12] <SWPadnos> uh. ok. well, I can't be of any help, I don't know what you're trying to do or how it's not working as you expect :)
[16:34:20] <danimal_garage> uh, i dont know what you mean, i spun it by hand and one full rotation increases the count, then decreases it
[16:34:28] <danimal_garage> it should continue to increase it
[16:34:43] <SWPadnos> ah, that's a clearer problem statement :)
[16:36:07] <SWPadnos> you'd get that if one of the resolver feedback channels couldn't go negative (though I don't know any way that would physically happen)
[16:36:59] <SWPadnos> hmmm. unless you have a differential output on the resolver and one of the wires is grounded or something
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[16:38:10] <danimal_garage> hmm
[16:38:28] <danimal_garage> i cant see how that would happen
[16:38:35] <SWPadnos> do you have a scope?
[16:38:49] <danimal_garage> nope
[16:39:01] <SWPadnos> how about a good voltmeter?
[16:39:09] <danimal_garage> i wouldnt say good
[16:39:09] <SWPadnos> good-ish maybe
[16:39:46] <danimal_garage> check the voltage from the coils on the resolver?
[16:39:51] <SWPadnos> yeah, kind of
[16:39:52] <danimal_garage> as i spin it?
[16:39:59] <SWPadnos> as you slowly turn it, yes
[16:40:02] <danimal_garage> ok
[16:40:07] <danimal_garage> i'll give it a shot
[16:40:18] <SWPadnos> unless you know what the waveform is supposed to be, it won't do a lot of good
[16:40:46] <danimal_garage> yea
[16:40:48] <SWPadnos> there should be a sine and a cosine wave, but it would be very helpful to know where they're centered
[16:41:12] <SWPadnos> (0-10V, 0-5V, +/-5V, +/- 10V, +/-2V ...)
[16:41:29] <danimal_garage> oh ok gotcha
[16:41:51] <danimal_garage> so that could be different from the resolver i replaced, making it not work?
[16:42:06] <SWPadnos> that could be
[16:42:16] <SWPadnos> that isn't why I mentioned it though
[16:42:45] <danimal_garage> why?
[16:42:46] <SWPadnos> if you know you're supposed to have a +/- X waveform, and you never see a + (or -) voltage, then you know the device is bad
[16:42:59] <danimal_garage> ah
[16:43:11] <SWPadnos> if you don't know what the waveform is supposed to be, it's harder to tell if your meter readings make sense
[16:43:23] <danimal_garage> well it was good when removed (it came off my lathe's spindle)
[16:43:40] <danimal_garage> but i know that doesnt mean much
[16:44:08] <SWPadnos> nope :)
[16:44:14] <danimal_garage> i'm waiting for my iron to warm up
[16:44:36] <danimal_garage> i got a new feedback cable i'm going to use, to eliminate that variable
[16:44:44] <SWPadnos> oooh, it's above 0 now. time to get the mail
[16:44:53] <danimal_garage> haha
[16:44:55] <danimal_garage> ouch
[16:45:10] <SWPadnos> it was -10 when I got up this morning, now it's close to +10
[16:45:34] <danimal_garage> wow
[16:45:41] <danimal_garage> i dont miss those days
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[16:53:29] <danimal_garage> what if the polarity is wrong for the excitor coil?
[16:54:20] <SWPadnos> I imagine that would result in backwards motion, if anything
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[17:07:00] <danimal_garage> 0 to plus 5
[17:07:07] <danimal_garage> or close to it
[17:07:29] <danimal_garage> my meter measures 4v but it's analog
[17:07:32] <danimal_garage> and cheap
[17:10:07] <tom3p> it only swings 1 way for one turn? not up then down?
[17:11:19] <SWPadnos> I'd check both feedback lines. if one goes 0-5V and the other +/-5V, that's the culprit :)
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[17:12:09] <danimal_garage> i did
[17:12:15] <danimal_garage> both +5
[17:12:35] <danimal_garage> i'm going to attemp to check one of the resolvers on a working axis
[17:13:07] <Jymmm> Heh, sounds like your feedback went bisexual swinging BOTH ways =)
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[17:20:37] <danimal_garage> i found the resolver specs in the manual for the one that i'm replacing
[17:21:08] <danimal_garage> the drives will work with a resolver with a transformation ratio between 0.5 and 1.0
[17:21:19] <danimal_garage> what does that mean?
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[17:30:44] <Jymmm> Hey guys, check this out... It's a nibbler that you connect to your drill: http://www.amazon.com/Sheet-Metal-Nibbler-Drill-Attachment/dp/B002HSQF16/ref=sr_1_29?s=automotive&ie=UTF8&qid=1296494986&sr=1-29
[17:34:25] <tom3p> danimal_garage, hth about r/d converters and trafo ratios ( its gears, just electric ) http://www.controlsciences.com/resolver_application_data.shtml
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[17:38:31] <SWPadnos> Jymmm, here's the lifetime warranteed version: http://www.baddogtools.com/dotnetnuke/Tools/BadDogBiter.aspx
[17:38:42] <SWPadnos> they had a booth at CES, and man did their tools work well
[17:39:16] <SWPadnos> they had put 50 holes in a file with one of their drill bits, and as the guy said, it was "starting to get tired"
[17:39:22] <Jymmm> SWPadnos: just sheet metal? or up to 1/8" thick too?
[17:39:38] <SWPadnos> the guy cut designs in a copper pipe
[17:39:55] <Jymmm> diameter pipe?
[17:40:04] <SWPadnos> a couple inches or so
[17:40:09] <Jymmm> ah
[17:40:10] <SWPadnos> also sheets and stuff
[17:40:47] <Jymmm> I was thinking panel cutouts for humble (sp) boxes
[17:40:55] <SWPadnos> they even have a lifetime warrantee on their drill bits (!) - if one gets dull, they'll replace it
[17:41:17] <Jymmm> "Just pay shipping both ways"
[17:41:21] <SWPadnos> heh
[17:42:29] <Jymmm> SWPadnos: like the case I sent you but not SS
[17:42:39] <danimal_garage> so the transformation ratio is the ratio of the input voltage to the output?
[17:42:44] <SWPadnos> yeah, Hoffman, Hammond, Bud ...
[17:42:52] <SWPadnos> danimal_garage, most likely
[17:43:06] <Jymmm> hammond, that's it =)
[17:43:08] <danimal_garage> so the new one is 1:1, so it should work. hmmm
[17:43:15] <SWPadnos> what they're saying is that as long as the output voltage is at least half the input (excitation) voltage, it'll work
[17:43:23] <danimal_garage> huh
[17:43:29] <danimal_garage> wonder why it wont work then
[17:43:43] <SWPadnos> what was the transformation ration on the old one?
[17:43:48] <SWPadnos> there may be jumpers to set
[17:43:49] <danimal_garage> .5
[17:43:57] <danimal_garage> no jumpers
[17:44:09] <SWPadnos> are there settings in the drive?
[17:44:23] <danimal_garage> the manual says the drive works with .5-1
[17:44:30] <danimal_garage> not that i can tell
[17:44:42] <danimal_garage> i looked in the software
[17:45:49] <Jymmm> Eeeeeeeesh http://www.sjdiscounttools.com/aes-87605.html versus http://www.amazon.com/Plastic-Razor-Blades-100-Pcs/dp/B0020WVBG8/ref=sr_1_1?ie=UTF8&qid=1296495936&sr=8-1
[17:47:06] <danimal_garage> there's a schematic with 2 wiring options.... e(s1-s3)*[ke(r1-r2) cos 0} or e(s2-S4)*[ke(r1-r2)) sin 0}
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[17:47:23] <danimal_garage> -} =]
[17:47:29] <Jymmm> .04/ea versus 1.42/ea
[17:47:40] <danimal_garage> -} +]
[17:48:00] <Jymmm> a trig schematic???
[17:48:02] <cradek> I've never heard of a plastic razor blade
[17:48:08] <danimal_garage> i guess
[17:48:15] <Jymmm> cradek: Oh, they're awesome!!!
[17:48:25] <danimal_garage> sorry thats under the schematic
[17:48:40] <Jymmm> cradek: scrap anything without leaving a scratch on the material
[17:48:48] <cradek> huh, neat
[17:49:38] <Jymmm> cradek: If you paint a model that you've tape masked, you can remove the tape without scratching the paint as example
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[17:50:46] <Jymmm> cradek: Or if you overspray something, you can come back and scrap off the excess
[17:52:44] <danimal_garage> is the rotor primary always the excitor?
[17:53:37] <Jymmm> cradek: better pic http://www.amazon.com/Plastic-Razor-Blades-Chisel-Design/dp/B003E3Q5AY/ref=pd_sim_auto_2
[17:53:57] <Jymmm> cradek: but that one is chisel design, not like razor
[17:56:04] <Jymmm> also good for those that are accident prone with sharp objects
[18:00:47] <cpresser> Jymmm: so I need to get some of those :)
[18:01:08] <cpresser> i am a master in creating self-inflicted-wounds
[18:01:08] <Jymmm> cpresser: Yeah, save on band-aids
[18:01:14] -!- ve7it [ve7it!~LawrenceG@S0106009027972e37.pk.shawcable.net] has joined #emc
[18:01:18] <Jymmm> or ER visits
[18:01:35] <Jymmm> ve7it: you rang?
[18:02:41] <pcw_home> danimal_garage: yes the rotor is the excitor and the two stator windings are the sine and cosine outputs
[18:04:38] <pcw_home> (you can usually tell which is which as the rotor winding will have a different resistance than the sine/cosine windings
[18:04:40] <pcw_home> the sine and cosine outputs should be the same resistance
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[18:09:20] <ve7it> Jymmm, yea, but I forget what I wanted to ask you.... old age is cool... problems only last a day or two
[18:09:47] <Jymmm> ve7it: LOL, what did you say, I forgot
[18:10:21] <Jymmm> ve7it: Ever see my "Teddy Bear"?
[18:14:15] <danimal_garage> any chance of changing the transformation ratio with a resistor?
[18:16:43] <danimal_garage> either on the rotor or on both of the stator windings?
[18:17:48] <cradek> increase or decrease? maybe those little AF transformers?
[18:17:55] <danimal_garage> decrease
[18:18:03] <danimal_garage> it's 1, it needs to be .5
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[18:21:28] <Jymmm> cut it in half with a plasma cutter!
[18:21:45] <danimal_garage> how about i use your plastic razor
[18:22:07] <Jymmm> there ya go! See, multiple uses for plastic razor blades!!!
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[18:24:27] <danimal_garage> cradek, do you think a transformer would be a better idea than a resistor?
[18:24:40] <cradek> I don't know...
[18:25:01] <danimal_garage> me neither
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[18:28:07] <Tom_itx> what did you need?
[18:28:51] <Tom_itx> what is 'transformation ratio' ?
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[18:29:37] <danimal_garage> for my resolver.... the output voltage is the same as the input. it needs to be half of that (transformation ratio of .5 instead of 1)
[18:29:40] <Tom_itx> how would a resistor change the ratio?
[18:30:06] <Tom_itx> it would limit the current
[18:30:12] <danimal_garage> ah
[18:30:19] <Tom_itx> what's the v out?
[18:30:27] <danimal_garage> approx 5v
[18:30:34] <Tom_itx> and you need 2.5v out?
[18:30:38] <danimal_garage> yes
[18:30:42] <Tom_itx> a diode drop is .6v
[18:31:19] <danimal_garage> ac, not sure if that matters
[18:31:23] <Tom_itx> 4 would be a 2.4v drop
[18:31:26] <Tom_itx> oh
[18:31:28] <cradek> that's not going to work at all...
[18:31:32] <Tom_itx> no
[18:31:34] <Tom_itx> not on ac
[18:31:35] <cradek> it's a low voltage analog signal
[18:32:03] <cradek> bbl
[18:32:05] <Tom_itx> why does it need to be 2.5v?
[18:32:14] <Tom_itx> there are voltage translators
[18:32:18] <danimal_garage> because the transformation ratio needs to be .5
[18:32:20] <Tom_itx> and you can do that with a mosfet too
[18:32:29] <danimal_garage> for the drive
[18:32:52] <Tom_itx> i'll stay out of it since i don't know exactly what you're doing
[18:33:22] <Tom_itx> a transformer may invert the signal too though
[18:33:24] <Tom_itx> consider that
[18:34:09] <Tom_itx> or at least pay attention to the leads you use
[18:34:13] <danimal_garage> i have a resolver, but it's the wrong one for the drive. the resolver it needs has an output voltage half of the input voltage. the resolver i have has the same output voltage as the input voltage
[18:34:38] <Tom_itx> i know, you pulled it off your lathe
[18:34:43] <danimal_garage> inverting is fine, i can change that in the software
[18:35:01] <Tom_itx> if you use a transformer, just swap the leads
[18:35:05] <Tom_itx> that'll change the phase
[18:35:08] <danimal_garage> that too
[18:35:25] <danimal_garage> i just gotta figure out what i need for a transformer
[18:35:40] <Tom_itx> something with a 2:1 ratio
[18:35:41] <Tom_itx> :)
[18:35:45] <danimal_garage> ha
[18:36:05] <Tom_itx> wind a toroid
[18:36:15] <Tom_itx> not much current to worry about
[18:36:17] <danimal_garage> i never used one before, i'm unaware of their specifications
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[18:37:49] <Tom_L> http://www.pronine.ca/multind.htm
[18:39:54] <danimal_garage> hmm
[18:40:01] <Tom_L> http://info.ee.surrey.ac.uk/Workshop/advice/coils/
[18:41:01] <Tom_L> well sob. my pc is givin me fits now
[18:41:23] <danimal_garage> i was hoping just to buy one, maybe i'll head over to frys
[18:41:28] <danimal_garage> ah that sucks
[18:41:43] <Tom_L> that last one is probably one of the best ref on the topic
[18:42:47] <Tom_L> does the resolver give a ÁH value ?
[18:42:50] -!- Tom_itx has quit [Ping timeout: 240 seconds]
[18:43:53] <Jymmm> Tom_L: Because you're out of shape and it wants you to be healthy!
[18:44:06] <danimal_garage> no
[18:44:13] <Tom_L> the itx is on 24/7
[18:44:23] <Tom_L> i think it needs some love
[18:45:02] <Jymmm> give it an extra couple of cooling fans
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[18:45:26] <Tom_L> i did
[18:45:27] <Jymmm> heart shaped ones
[18:45:33] <Tom_L> :O
[18:45:39] <Jymmm> for velentines
[18:45:48] <Jymmm> a
[18:46:05] <Tom_itx> http://tom-itx.dyndns.org:81/~webpage/itx/itx_thumb_index.php
[18:46:12] <Tom_itx> there's it's construction page
[18:46:45] <Jymmm> there what, one fan? maybe two?
[18:46:50] <Tom_itx> 2
[18:46:56] <Jymmm> no vent holes
[18:47:02] <Tom_itx> top and side
[18:47:44] <Jymmm> JUSt above the fan, not above the hdd or rest of it
[18:47:46] <Tom_itx> the top vent is ducted to the cpu fan
[18:48:04] <Tom_itx> the other fan is on the right side with vent slots on the left
[18:48:08] <Jymmm> and it's too small
[18:48:13] <Tom_itx> it's been running solid for several years
[18:48:25] <Jymmm> doesn't even cover the whole fan
[18:48:53] <Jymmm> you need 1/2" larger duct, but I would't have done that
[18:49:12] <Jymmm> fan mounted to roof maybe
[18:49:27] <Jymmm> vents on the sides
[18:49:27] <Tom_itx> it brought the cpu temp down quite a bit
[18:49:45] <Jymmm> sure, but you need the tamp on EVERYTHIGN down
[18:50:02] <Jymmm> hdd's get hot these days
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[18:52:26] <Tom_itx> i ran an old st238 without a lid for a while
[18:53:01] <Tom_itx> it had a loose power connector that took a while to find
[18:53:42] <Tom_itx> short story, it met the wall once, got 'investigated' by taking the lid off, covered it back up and ran for another 6-8 years
[18:53:50] <Tom_itx> after soldering the power plug
[18:54:25] <Tom_itx> not normal procedure for me though usually
[18:54:35] <atmega> my first HD was an st-238r, I loved it.
[18:56:16] <danimal_garage> i found a local guy with a bunch of resolvers
[18:56:22] <danimal_garage> i'm going to grab one
[18:56:28] <danimal_garage> bbl
[18:56:28] <Tom_itx> cool
[18:56:34] <danimal_garage> yea, $200 though!
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[18:56:39] <danimal_garage> ouch
[18:56:40] <Tom_itx> o
[18:56:44] <Tom_itx> well, it's just money
[18:56:52] <danimal_garage> but he might trade for my spare drive
[18:57:11] <danimal_garage> yea, but every day that my machine is down costs me a lot of money
[18:57:23] <danimal_garage> more than the resolver, thats for sure
[18:57:45] <Tom_itx> hmm, sounds like the hdd may have a bearing going
[18:59:08] <danimal_garage> ouch
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[19:32:29] <Jymmm> Tom_L: Better dd that hdd asap
[19:37:32] -!- kb8wmc_ [kb8wmc_!~chatzilla@] has joined #emc
[19:39:38] <Tom_L> yup, it's dying
[19:39:44] <Tom_L> nothing critical on it
[19:39:54] <Tom_L> just use it mostly for irc 24/7
[19:40:23] <Tom_L> just be quicker to swap if i ghost'd it
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[19:53:09] <andypugh> Well, as of 10 minutes ago, EMC2 has been used to make prototype parts for Ford. (And I am frozen)
[19:54:40] <ries> andypugh: nice....
[20:00:17] <Jymmm> ve7it ve7it de jymmm
[20:02:19] <ve7it> harro
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[20:35:16] <Jymmm> ve7it: you see my "teddy Bear" ?
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[21:13:55] <ve7it> Jymmm, no teddy bears here... are you cnc'ing them?
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[21:23:18] <Jymmm> ve7it: ping
[21:23:35] <Jymmm> ve7it: http://i54.tinypic.com/k2mo7n.jpg
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[21:24:49] <ve7it> Jymmm, looking
[21:25:08] <Jymmm> ve7it: Laser engraved on 12" granite tile
[21:25:15] <ve7it> cool
[21:25:40] <Jymmm> ty
[21:25:42] <ve7it> does laser on granite make smoke?
[21:25:59] <Jymmm> nope, tad of dust, but very little
[21:26:15] <ve7it> how rough does the lasered surface feel?
[21:27:09] <Jymmm> Um, maybe 200 grit I guess
[21:27:40] <ve7it> it would be cool to do a shower stall with lasered tiles.... lots of faces watching you take a shower!
[21:27:48] <Jymmm> lol
[21:28:05] <ve7it> spooky when the eyes start to follow you!
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[21:28:42] <ve7it> how long does it take to do a typical tile with the laser?
[21:28:50] <Jymmm> 60m
[21:30:50] <Jymmm> ve7it: prepping the photo can take longer though.
[21:33:24] <ve7it> that bear would look good on a fireplace surround - woodsey theme
[21:33:39] <Jymmm> good idea
[21:34:25] <ve7it> the real money is in pet headstones
[21:35:15] <ve7it> gramma gets a pine box, fifi gets a granite headstone
[21:35:35] <Jymmm> but fifi only dies once
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[21:36:14] <Jymmm> teddy lives forever
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[21:51:52] <Jymmm> http://www.western-components.com/
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[22:07:26] <paul11997> hello has anyone played with a tb6560 three axis drive board, I just set one up and I was wondering about the timing in stepconfig, right now I'm using 3800 for step time and space and 10000for dir hold and settup
[22:11:04] <danimal_garage> so i went to get that resolver, and i ended up getting an enclosure, an encoder for my spindle, and a jog pendant as well
[22:11:11] <danimal_garage> that guy had tons of stuff
[22:15:06] <paul11997> danimal what guy who that be?
[22:15:35] <paul11997> would
[22:15:45] <paul11997> oops
[22:15:52] <danimal_garage> this machinery dismantler here in san diego, ca
[22:16:05] <danimal_garage> gary mills enterprises
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[22:20:49] <paul11997> danimal what are you setting up
[22:20:54] <danimal_garage> i got a 30x22x12 electrical enclosure. I hope it's big enough
[22:21:23] <danimal_garage> a shizuoka mill. It's been built and running for almost a couple years now, i'm just upgrading stuff
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[22:29:13] <paul11997> danimal what type of setup i've got an old lagun with anilam controls and am looking to up grade the controls
[22:30:28] <danimal_garage> what do you mean by setup? it's just a big knee mill with an emc retrofit. It had steppers, i'm putting servos on it now
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[22:33:08] <paul11997> that is what i want to do to mine but i'm new to emc and trying to learn what works
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[23:02:27] <paul11656> has anyone set up a tb6560 three axis board on emc2?
[23:11:48] <danimal_garage> well the new resolver is doing a similar thing. However, it was questionable what the specs were, so no big suprise. But i noticed one thing... if i spin it slow, it barely registers movement no matter how many times i rotate it. If i spin it fast, it actually changes the position in the direction that it should, but not accurately.
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[23:12:24] <Valen> sounds like the exciter might be suss
[23:12:29] <Valen> you really need a scope
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[23:16:06] <Valen1> where are you geographically danimal_garage?
[23:17:14] <danimal_garage> san diego, ca
[23:17:16] <danimal_garage> usa
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[23:18:42] <Valen> http://cgi.ebay.com/2Msps-sampling-rate-ARM-DSO-Nano-Pocket-Oscilloscope-/270698220250?pt=BI_Oscilloscopes&hash=item3f06df0ada#ht_3774wt_907
[23:18:52] <Valen> one of those might even do for resolvers at 10khz
[23:20:18] <Valen> http://cgi.ebay.com/Tek-Tektronix-2246A-100-MHz-Oscilloscope-/160537406209?pt=BI_Oscilloscopes&hash=item2560c66b01#ht_4248wt_1141 is a rather nice looking scope
[23:20:34] <Valen> allthough thats dead lol
[23:20:51] <danimal_garage> yea, i need the machine running yesterday though. I think i'm just gunna throw a stepper back on it for now
[23:21:05] <Valen> fairy nuff
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[23:21:33] <danimal_garage> i'm past due on some parts :(
[23:21:45] <danimal_garage> well i gotta eat, i'll bbl
[23:21:49] <danimal_garage> thanks
[23:21:51] <Valen> if they aren't too complex we'll help lol
[23:21:58] <danimal_garage> lol
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