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[00:17:27] <andypugh> OK, night all
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[03:04:37] <MattyMatt> are the plans for dumpsterCNC's turret available?
[03:05:43] <MattyMatt> I've seen other people's copies
[03:08:58] <MattyMatt> or very similar ones. is it based on a Hardinge one or something?
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[05:26:11] <waynegramlich> Total newbie here. Is there anyone else here?
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[06:13:56] <kvirdi> hey John T
[06:14:29] <kvirdi> i got a response from jon elson regarding my encoder issues and he suggested that i check the voltages of my A and B phase connections
[06:15:06] <kvirdi> he said i should get a min of 3v with the motor spinning, i got 3v max
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[07:31:46] <Jymmm> Ping?
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[13:52:57] <mrsun> hmm, liquid cooling needed :/
[13:53:09] <mrsun> destroyed one carbide mill and broke another :P
[13:53:15] <mrsun> until i figured it out :P
[13:53:25] <mrsun> can i drench the piece in liquid coolant ?
[13:53:33] <mrsun> insted of pumping it over the piece
[13:53:46] <mrsun> ofc, pumping it will evaquate some chips
[13:54:00] <archivist> carbide does not mind temperature
[13:54:31] <mrsun> archivist, the alu does
[13:54:32] <mrsun> :P
[13:55:00] <archivist> can be better dry because intermittent cooling cracks the carbide
[13:55:19] <mrsun> archivist, well how the heck do i cut soft alu dry? :/
[13:55:51] <archivist> yes its sticky, so flood cooling
[13:55:57] <mrsun> tried dry first, that was what destroyed the first milling bit, tried with a little (wd-40) coolant on the 2nd, that also got to hot so it built up material infront of the mill and broke it off
[13:56:43] <archivist> also are you climb or conventional milling
[13:57:01] <mrsun> so i took the broken off bit, put it in the mill, reset and then i "flooded" it with wd-40 and it cut perfectly
[13:57:04] <mrsun> archivist, slot
[13:57:10] <mrsun> cutting out a panel in 2mm alu
[13:57:22] <mrsun> so i guess, none of them ? :P
[13:57:39] <mrsun> or, conventional maybe it becomes, goes clockwise and the spindle rotates clockwise
[13:57:50] <archivist> slot is both , you need care as chips need removal
[13:58:55] <mrsun> alot has gone wrong today :/
[13:59:01] <theorbtwo> By "flooded" you mean you continualy sprayed wd-40 at it?
[13:59:08] <archivist> a learning process
[13:59:12] <mrsun> two milling bits and the cables snagged from the Z axis stepper ripping them off :P
[13:59:18] <mrsun> archivist, aye =)
[13:59:29] <mrsun> theorbtwo, dusted every like 2 secs on the bit :P
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[14:01:38] <mrsun> archivist, first time ever i mill sticky alu so =)
[14:02:32] <archivist> also dont cut too deep either
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[14:03:01] <mrsun> archivist, what is a normal cut in that stuff then ? :)
[14:03:07] <mrsun> atm i have like 1mm stepdown
[14:03:10] <mrsun> might be a bit much :P
[14:03:25] <archivist> dia of endmill?
[14:03:29] <mrsun> 4mm
[14:03:42] <anonimasu> that sounds pretty much
[14:04:01] <mrsun> well im used to my casted alu
[14:04:07] <mrsun> that i can cut whatever i like in, never sticks :P
[14:04:10] <archivist> that should be ok, lubricant is probably the main issue
[14:04:39] <mrsun> so next step in the mill then is flood coolant :P
[14:04:48] <mrsun> hmm, i wonder how i should built that :P
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[14:10:08] <mrsun> fack, using my new chassie i was thinking of having it under the mill, but if im going to have flood coolant i dont know if id like to have 220VAC right under the water :P
[14:18:25] <skunkworks> http://groups.yahoo.com/group/mach1mach2cnc/message/126278
[14:23:50] <alex_joni> skunkworks: sounds like vaporware advertisement
[14:24:00] <skunkworks> hi alwx
[14:24:03] <skunkworks> alex
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[14:27:27] <alex_joni> hey sam
[14:29:01] <skunkworks> it is friday!
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[14:38:14] <alex_joni> indeed it is, friday after 4pm ;)
[14:39:16] <skunkworks> nice ;)
[14:39:28] * skunkworks needs to get some coffee
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[15:03:37] <archivist> I have to wash some spoons else no coffee!
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[16:20:44] <danimal_garage> mornin
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[16:32:04] <Jymmm> http://www.youtube.com/citizentube?feature=ticker
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[16:48:37] * mrsunshine_ needs to make covers for the steppers if he is going to do liquid cooling
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[16:51:42] <anonimasu> mrsun: or go with minimal lubircation
[16:52:39] <Jymmm> Anyone know of a "roll on" way to dispense glue? Not like a paint roller, but like a 1/2 to 1" wide roller like some deodorants?
[16:53:29] <bill20r3> what kind of glue?
[16:53:47] <Jymmm> Like Elmers or slightly thinner
[16:53:55] <Jymmm> skool glue or thinner
[16:54:09] <bill20r3> I think there are bottles for biscuits that have a little roller.
[16:54:23] <mrsunshine_> anonimasu, feels like its not fool proof enough for me :P
[16:54:38] <bill20r3> http://www.amazon.com/gp/product/B000H55IRS/
[16:54:48] <Jymmm> bill20r3: I've seen curved dispenser for biscuits, but not a roller
[16:55:05] <skunkworks> http://www.amazon.com/Roller-Biscuit-Bottle-Peachtree-Woodworking/dp/B000A874DS
[16:55:23] <Jymmm> bill20r3: thanks, looks cheap enough too
[16:55:54] <Jymmm> I wonder if you can control the flow
[16:56:45] <Jymmm> I've tried spray on adhesive, but LOTS of overspray
[16:59:17] <JT-Work> Jymmm: you can get glue rollers in woodworking places
[17:03:16] <mrsunshine_> does anyone have cad files of the nema23 stepper frame motors with ALL screw holes? (including the ones taht hold the steppers together)
[17:03:17] <Jymmm> Yeah, I thought roll-on would be the way to go. But after looking at those bottles I'm not too sure. I think I need the reverse, where the roller and glue reservoir sits on the table and you roll the piece on top of the roller. or even one with multiple rollers to even out the glue
[17:03:54] <Jymmm> mrsunshine_: The screws tht hold the stepper together I dont think are standard layout
[17:04:13] <Jymmm> just the stepper dimensions
[17:04:16] <bill20r3> Jymm, what're you making, anyway?
[17:04:16] <mrsunshine_> Jymmm, seems to have 4 different according to dyi engineering or whatever they are called
[17:04:58] <Jymmm> bill20r3: Best way to describe it is glueing layers of stencils together
[17:05:19] <bill20r3> uhm, ok.
[17:05:34] <mrsunshine_> ofc, i could remove a screw and check atleast the size and distances to the edges for them
[17:05:38] <mrsunshine_> should give me a clue =)
[17:05:44] <danimal_garage> he's making paper plate bean shakers
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[17:05:52] <bill20r3> heh.
[17:06:00] <Jymmm> bill20r3: Example, consider this cut out of wood, and stacking and glueing 5 together
[17:06:02] <Jymmm> http://www.votenader.org/blog/assets/large_peace_symbol.jpg
[17:06:17] <danimal_garage> he wants his glitter princess to have crisp edges
[17:06:35] <bill20r3> oh, so just making something thick, out of thin material..
[17:06:47] <Jymmm> bill20r3: Basically yeah
[17:07:12] <danimal_garage> laminating
[17:07:20] <danimal_garage> is the technical term i believe
[17:07:23] <bill20r3> maybe just a paintbrush..
[17:07:54] <Jymmm> bill20r3: I only want the glue on the surfaces, not overspray (so to speak)
[17:08:32] <anonimasu> Jymmm: I saw a roller like that somewhere, but idk
[17:09:07] <Jymmm> anonimasu: I did too at one point years ago, but it was ona very expensive machine
[17:09:13] <anonimasu> Jymmm: how about making a feeder that keeps it with glue as long as you spin it
[17:09:43] <anonimasu> like a V feeder on top with a lip to keep the right ammount of glue on the roller as you spin it
[17:11:42] <Jymmm> I was thinking something like this, where the '()' is a height adjustable roller, and the box is a glue reservoir....
[17:11:47] <Jymmm> --+--()--+--
[17:11:47] <Jymmm> | |
[17:11:47] <Jymmm> | |
[17:11:48] <Jymmm> +------+
[17:12:22] <bill20r3> like a desktop scotch tape dispenser, where the pocket where the tape sits is filled with glue..
[17:13:27] <Jymmm> (side view)
[17:14:19] <Jymmm> Does wood glue stick to PTFE ?
[17:15:18] <Jymmm> or anyone know what plastic is used for the botle that wood glue comes in?
[17:15:58] <bill20r3> check the recycling symbol, if it has one.
[17:18:54] <Jymmm> Heh,
http://www.quickmachinerycompany.com/products/GA/RCGS/
[17:19:29] <Jymmm> Closer...
http://www.propacksolutions.com/potdevin/type_z_coating_by_potdevin.htm
[17:21:02] <Jymmm> Hey, only $3200
http://www.commercial-hot-glue.com/shop_content/prod_img/full/8b68432db03371d09ca3193bcca4f477/4478f898a3f2dcf82f12a74fa4e87752/853_use_shot.jpg
[17:21:11] <Jymmm> dispenses hot melt glue
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[17:24:21] <Jymmm> Well shit...
http://web.resna.org/library/conference_2010/SDC2010/Guoj/Photo_1.jpg
[17:24:38] <Jymmm> With design notes and everything...
http://web.resna.org/library/conference_2010/SDC2010/GuoJ.html
[17:26:50] <Jymmm> I think if I add in an additional roller (much like an offset printing press) I can can more consistent coverage
[17:27:04] <Jymmm> s/cab/have/
[17:27:06] <Jymmm> bah
[17:28:24] <anonimasu> yeah, but you need a remover so it dosnet get too much
[17:28:35] <anonimasu> where do i buy encoders?
[17:28:36] <bill20r3> you must be making a lot of something, to be needing a glue-a-majag.
[17:28:54] <anonimasu> heidenhain dosent want to sell me renco if i dont order 10 at once..
[17:29:05] <Jymmm> bill20r3: You could say that =)
[17:29:53] <anonimasu> 8k lines/rev..
[17:30:01] <anonimasu> they were 85 eur each
[17:37:35] <danimal_garage> ebay?
[17:38:27] <anonimasu> I need 3 the same
[17:38:29] <anonimasu> need/want
[17:38:35] <danimal_garage> automationdirect.com?
[17:38:35] <anonimasu> and i dont want heidenhain
[17:39:00] <Jymmm> s/need\/want/desire\/lust/
[17:40:21] <anonimasu> I can buy them but it's wasted money
[17:41:00] <anonimasu> how many counts do 2500 lines/rev give?(resolution)
[17:41:04] <anonimasu> it'd be like *4 right?
[17:41:31] <pcw_home> yep
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[18:03:58] <Tom_itx> who posted that programmable encoder a while back?
[18:04:04] <Tom_itx> those might work for anonimasu
[18:04:13] <Tom_itx> i don't recall the counts
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[18:20:05] <andypugh> jepler: Did you write the pci_8255 driver?
[18:21:28] <skunkworks> andypugh:
http://emergent.unpy.net/01165433819
[18:22:41] <andypugh> Maybe not the best sign.
[18:23:25] <skunkworks> it is in a box in the garage ;)
[18:23:29] <andypugh> I am wondering if the same driver (possibly with tweaks) will work for this chap:
http://www.linuxcnc.org/component/option,com_kunena/Itemid,20/func,view/id,7524/catid,27/limit,6/limitstart,0/lang,english/
[18:23:32] <Jymmm> WOW Lots of Tsunami damage in Santa Cruz
[18:23:42] <skunkworks> Jymmm: really?
[18:24:14] <Jymmm> skunkworks: Yeah, they say the worse damage on the Pacific Coast from MX to CA was in Santa Cruz
[18:24:48] <andypugh> I think Japan got it worse
[18:24:56] <skunkworks> much
[18:25:04] <Jymmm> East Pacific coast
[18:25:05] <andypugh> Have you seen the video with the cars trying to outrun it?
[18:25:09] <Tom_itx> several hundred dead so far
[18:25:24] <Jymmm> Just whatever you do, DO NOT donate money to the Red Cross
[18:25:35] <andypugh> A friends girlfriend is Japanese, and in the area, but unharmed
[18:26:45] <Jymmm> The Red Cross has not accounted for $11 Million dollars missing donated to the Haiti Relief Fund
[18:27:08] <Tom_itx> woops
[18:27:20] <skunkworks> overhead
[18:27:37] <Jymmm> ha, yeah right
[18:27:54] <Jymmm> more ike deep pockets
[18:28:54] <Jymmm> I used to Love the Red cross, but over the years they are really been mucking up
[18:29:01] <bill20r3> what is that $11mil in percent? it sounds like a lot, but maybe it's not.
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[18:31:40] <Jymmm> I can see maybe $10K unaccounted for, but not $11 MILLION
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[18:35:16] <toastyde1th> losing 10k requires incompetence, losing 11 million requires clever accounting
[18:35:30] <Jymmm> exactly
[18:36:35] <mozmck_work1> I've heard many similar things from the last several large disasters.
[18:36:50] <andypugh> Annual budget of IRC is 1100 million, so that $11 million is 1%
[18:37:36] <Jymmm> percentage really doesn't matter
[18:37:49] <Jymmm> They should be able to accoutn for every last cent.
[18:37:54] <mozmck_work1> Red cross gave debit cards to Katrina victims that were temporarily housed around here, but it turns out it was only a loan.
[18:38:06] <Jymmm> Heh,
http://abclocal.go.com/wabc/story?section=news/local/long_island&id=7973682
[18:38:23] <Jymmm> Red Cross Debit Card ?! WTF
[18:39:30] <mozmck_work1> It was something like that. Basically to help with needs while they were out of a house. But here we GIVE to RC, and they LOAN it to people in need.
[18:40:13] <Jymmm> It used to be when you donated blood, you had "credit" for your donatation that you could use for a family member in need of blood. I gave over 2 gallons of blood and then stopped the program.
[18:40:36] <Jymmm> I stopped donating blood about the same time.
[18:40:44] <andypugh> We give blood for free, and get it for free. I think I prefer that.
[18:41:21] <mozmck_work1> not exactly, you pay for it one way or another.
[18:41:59] <Jymmm> Hey, i dont mond donating and it being used to sell to hospitals for $30+ /pint, knowing that if a family member got into an accident they could have what I donated, but taking away that program is just BS
[18:42:52] <Jymmm> the RC *MUST* exist w/o using tax dollars, but damn
[18:43:04] <andypugh> Yeah, but it is bad enough not being able to afford that pint of beer that you need. Running out of cash on the operating table would be really depressing.
[18:43:18] <atmega> here, we hire homeless people to give blood for us and it goes in our account.
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[18:43:28] <Jymmm> hire?
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[18:43:42] <atmega> give them $10, or a bottle of wine
[18:43:52] <andypugh> And they presumably don't lie about aids/hepatitis etc to get the money, do they?
[18:43:57] <Jymmm> Eh, I guess that's ok.
[18:44:32] <andypugh> But this is probably not the forum to debate the merits of socialised v private medicine :-)
[18:44:49] <atmega> I must made that up, I thought it would be a more disturbing prospect than it appeared to be :)
[18:45:13] <atmega> <- trolling failure.
[18:48:16] <Jymmm> My bad, it wasn't $11 Million, it was $9 BILLION in missing donations
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[18:50:26] <atmega> aare you sure that isn't teh $9b the US lost in iraq?
[18:51:01] <bill20r3> it's on the Island of Lost Shipping Pallettes of Cash.
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[19:05:24] <andypugh> According to Wikipedia "The 2009 budget of the ICRC amounts more than 1 billon Swiss Francs"
[19:05:51] <andypugh> As a swiss franc is almost exactly a dollar, losing 10 years budget looks like carelessness.
[19:06:23] <atmega> I'm betting faulting google conflation
[19:16:19] <atmega> with
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[19:55:01] <danimal_garage> so i called the company that made my servos and drives and found out there's a current setting for the drives, and i need to reduce that if running on single phase
[19:55:21] <cradek> weird
[19:55:33] <danimal_garage> the drives could have been overworked, causing weird stuff to happen
[19:55:52] <danimal_garage> plus being overly hot out lately, could have pushed it over the top
[19:58:12] <danimal_garage> and you can run higher current with 115v than 230v
[19:59:12] <danimal_garage> weird, huh?
[20:01:37] <skunkworks> huh - switching loss?
[20:01:45] <skunkworks> (at higher voltages)
[20:04:16] <danimal_garage> electronics cant handle the higher current plus the higher voltage
[20:04:29] <danimal_garage> can only be one or the other
[20:04:51] <skunkworks> have you tried it yet? working better?
[20:05:12] <danimal_garage> so far but i know how that goes
[20:06:09] <skunkworks> heh - what did they say about differential encoder issues?
[20:06:49] <danimal_garage> said it shouldnt have any issues unless the drives are bad
[20:08:24] <danimal_garage> bbl, lunch time
[20:08:41] <skunkworks> http://groups.yahoo.com/group/mach1mach2cnc/message/126290
[20:11:34] <cradek> he is on the right track - he has realized it needs to track position, not velocity
[20:11:57] <skunkworks> I am sure he will get there.
[20:12:09] <cradek> wonder he deals with initial accel - to avoid stalling steppers when it syncs
[20:12:23] <skunkworks> he probably looked at how emc is doing it ;)
[20:12:27] <andypugh> Having to account for windows not doing as it is asked seems to add a certain complexity.
[20:12:55] <skunkworks> I think the part he is working is pretty realtimey
[20:13:01] <cradek> yes I think "in the driver" is their "realtime" code
[20:13:19] <cradek> ... where he has no floating point math apparently
[20:13:25] <cradek> I don't envy him
[20:13:29] <skunkworks> heh
[20:13:49] <cradek> threading was hard enough to do on our much better platform
[20:14:44] <skunkworks> you definatly had your share of bugs
[20:14:54] <cradek> yes it took a few tries
[20:15:17] <JT-Work> on my BP rigid tapping is not done on the 386 but on a sub board
[20:15:29] <cradek> huh!
[20:15:41] <JT-Work> so you can't interrupt it with the hold button
[20:16:30] <cradek> feed-holding a tap move is nfg
[20:16:55] <JT-Work> if you have not got there yet it is ok
[20:17:19] <JT-Work> like Oh Shit that is not the correct place for the tap to try and make a new hole
[20:17:25] <cradek> haha
[20:17:36] <cradek> they make such a nice crunching noise
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[20:17:50] <cradek> better to crunch a tap outside the hole than inside it
[20:18:18] <andypugh> Yeah, when are we going to have negative adaptive feed, for spark-erosion machines?
[20:18:44] <cradek> as soon as 'we' write it, probably
[20:19:46] <JT-Work> cradek: I'm almost done roofing what did you want me to fix
[20:19:57] <cradek> wha?
[20:21:33] <JT-Work> you were looking for someone to fix some code and I said when I'm done with the shingles I'll look at it but that was 2 months ago
[20:24:41] <danimal_garage> yay my ti and stainless just got delivered, i didnt get ripped off
[20:28:56] <psha> JT-Work: wow :) what's responsibility! :)
[20:29:09] <JT-Work> lol
[20:30:36] <danimal_garage> hi John
[20:30:48] <JT-Work> Hi Dan
[20:31:01] <danimal_garage> how goes it?
[20:31:44] <JT-Work> not bad installing a new motherboard and stuff and OS on this computer so it is upgrade hell at the moment
[20:32:10] <skunkworks> upgrading is fun if your livelyhood doesn't depend on it ;)
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[20:32:37] <danimal_garage> agreed skunkworks
[20:32:46] <danimal_garage> what mobo did u get?
[20:33:26] <JT-Work> asrock 890fx
[20:33:44] <JT-Work> pretty nice has a floppy header and that it important to me
[20:33:48] <danimal_garage> for a machine, or just a desktop pc?
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[20:34:00] <JT-Work> SSD for Winblows and SW to live on
[20:34:08] <JT-Work> my workstation
[20:34:17] <JT-Work> with wall to wall monitors
[20:34:19] <danimal_garage> what do u need a floppy header for? transfering programs to the machine?
[20:34:44] * skunkworks throws JT-Work a usb floppy drive....
[20:34:49] <danimal_garage> lol
[20:35:17] * JT-Work caught it and has a couple
[20:35:19] <seb_kuzminsky> ugh, fire again,
http://www.dailycamera.com/ci_17591549
[20:35:23] <danimal_garage> the b-port needs a floppy disk to load programs?
[20:35:35] <JT-Work> both of them do
[20:36:28] <andypugh> Did you see the Gasworks fire in Japan? Flames 4x the height of the gas spheres, and fire-engine jets to 1/4 the height of the spheres..
[20:36:53] <danimal_garage> which one besides the b-port? THe CHNC and plasma should use ethernet, correct?
[20:37:22] <danimal_garage> or do you have more than one?
[20:37:24] <JT-Work> I have a BP Series 1 with an Anilam 3 axis CNC on it
[20:37:46] <PCW> A fire this time of year?
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[20:39:29] <danimal_garage> oh yea forgot about that one
[20:39:41] <danimal_garage> PCW, i was thinking the same thing
[20:39:53] <danimal_garage> too wet here right now
[20:41:24] <danimal_garage> PCW, *might* have fixed the servo issue
[20:41:45] <PCW> What did you change?
[20:42:27] <danimal_garage> there's a current setting in the drive's software, and i cut that to the percentage that the manual said to derate it to for single phase
[20:42:59] <danimal_garage> i was under the impression that you just couldn't push it too hard, i didnt know there was an actual setting
[20:43:29] <danimal_garage> my guess is it worked the drives too hard and they were overheating and causing issues
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[20:44:01] <PCW> Still seems like you are not pushing the drives very hard, wouldn't they give you a overtemp fault?
[20:44:06] <danimal_garage> i called tech support and they confirmed that it might be an issue and their max operating temp is only like 40c
[20:44:28] <andypugh> Maybe dropping the bus voltage below a threshold, too much current out and not enough in at certain parts of the mains waveform?
[20:44:57] <danimal_garage> andypugh, i thought about that too but he didnt think so
[20:45:02] <PCW> 40C thats just barely warm are these these Alaska only models?
[20:45:07] <danimal_garage> haha
[20:45:12] <danimal_garage> thats what i said!
[20:45:22] <danimal_garage> i put a fan on them
[20:45:27] <andypugh> Superconducting resistors.
[20:45:48] <danimal_garage> pansywaist drives
[20:46:16] <fragalot> 40C limit?
[20:46:20] <danimal_garage> yea
[20:46:22] <fragalot> so basically.. fart and you break your machine?
[20:46:26] <danimal_garage> haha
[20:47:06] <danimal_garage> that could be the problem, i've been eating a lot of mexican food lately
[20:47:41] <fragalot> Sorry sir, bowel movements are not covered by our warranty
[20:47:46] <danimal_garage> ha
[20:48:05] <fragalot> what driver is this?
[20:49:02] <danimal_garage> pacific scientific
[20:49:14] <danimal_garage> pc3406ai
[20:49:26] <danimal_garage> no wonder they're out of business
[20:49:57] <fragalot> lol
[20:52:12] * Tom_itx throws a chunk of titanium at danimal_garage
[20:53:13] <danimal_garage> i just got some, thanks!
[20:53:45] <Tom_itx> did you figure out why your drives are missing?
[20:53:48] <danimal_garage> 60lbs of it
[20:53:56] <Tom_itx> $$
[20:54:07] <danimal_garage> not too bad, got a killer deal on egay
[20:54:23] <danimal_garage> i think i got it figured out
[20:54:27] <danimal_garage> but we'll see
[20:54:54] <danimal_garage> it was basically overworking the drives so they started acting funny
[20:55:03] <danimal_garage> i had to cut the current output
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[20:59:50] <seb_kuzminsky> PCW: it's not unusual to have fires in boulder this time of year
[21:00:48] <seb_kuzminsky> sunny, clear skies, strong winds
[21:01:07] <PCW> I'm surprised its not too wet
[21:01:23] <seb_kuzminsky> it's really dry down low
[21:01:29] <seb_kuzminsky> all the snow's up in the high country
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[21:02:16] <PCW> ahh, we don't have fire season until summer here
[21:02:46] <seb_kuzminsky> fire season's about 9 months here, we get a break in the fall
[21:03:07] <PCW> early fall is worst here (Oakland hills file was October)
[21:04:21] <danimal_garage> same here PCW
[21:04:24] <danimal_garage> in San Diego
[21:07:39] <PCW> Yea most fuel and Indian summer (I guess thats not PC anymore)
[21:09:31] <danimal_garage> i wont tell
[21:10:27] <danimal_garage> It's not as bad as the toilet humour in here of 20 minutes ago anyways.
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[21:53:49] <danimal_garage> so far so good with the positioning
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[21:56:21] <PCW> with fans?
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[21:59:09] <danimal_garage> well from dropping the current output
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[22:01:04] <danimal_garage> i am blowing a house fan on it though
[22:01:11] <danimal_garage> from a couple feet away
[22:03:07] <danimal_garage> i wish there was a way to add an encoder to the servos easily
[22:03:49] <danimal_garage> so skip the drives all together, just have the resolvers give feedback to the drives for the tuning/commutation, and encoders to emc for position
[22:04:37] <danimal_garage> i guess i could if i go with a belt drive instead of direct
[22:04:50] <PCW> just a mechanical problem (and you have a machine shop)
[22:05:22] <skunkworks> or use one of andypugh or jone resolver converters
[22:05:29] <skunkworks> (or 3)
[22:06:25] <danimal_garage> skunkworks, do you think i can have the resolvers do 2 duties?
[22:06:45] <danimal_garage> not sure if it can be connected to 2 devices at once
[22:06:48] <andypugh> I think I am honour-bound to mention Pete's Resolver converter here.
[22:07:03] <danimal_garage> i have the pico ones in my lathe
[22:07:13] <danimal_garage> they work fine, however $$$$
[22:07:23] <PCW> I dont think that helps because the drives need the resolvers for feedback (and the drive has to supply the excitation)
[22:07:25] <PCW> I know our converter need its own excitation
[22:08:12] <danimal_garage> can you create a fake resolver output to go from emc to the drives?
[22:08:14] <andypugh> Mine too, otherwise it doesn't know when to measure.
[22:08:23] <PCW> (IE it cant vampire onto the sine/cos lines with external exitation source)
[22:08:47] <PCW> I suppose its possible but would likely be noisy
[22:09:25] <danimal_garage> i'd need 3 DAC's to do it, huh?
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[22:09:29] <danimal_garage> or 6?
[22:09:36] <PCW> 6
[22:09:39] <danimal_garage> yea
[22:09:43] <danimal_garage> ehh
[22:10:24] <danimal_garage> that would be neat though
[22:10:28] <skunkworks> oh yah - the resolver is used for comutation
[22:10:33] <danimal_garage> yea
[22:10:47] <skunkworks> oh well - they will probably work nwo
[22:10:49] <skunkworks> now ;)
[22:10:56] <danimal_garage> hopefully
[22:11:13] <danimal_garage> still on position
[22:11:34] <PCW> Maybe they have some marginal components (like Electrolytic caps)
[22:11:35] <andypugh> Do the drives have scope for any other form of commutation input?
[22:12:39] <danimal_garage> yes, hall sensors i believe
[22:12:48] <andypugh> Damn! I omitted to add sin-cos outputs to the bldc component!
[22:12:48] <danimal_garage> however i'm not sure on thse ones
[22:13:02] <danimal_garage> dammit andypugh! lol
[22:13:27] <danimal_garage> actually that would be a real handy feature
[22:13:43] <andypugh> bldc.comp _does_ do Hall, in fact it does any possible Hall pattern from any other input (including any other hall pattern)
[22:13:46] <danimal_garage> in case you have servos without hall sensors
[22:14:05] <danimal_garage> cool
[22:14:45] <danimal_garage> i dont know if these drives can use hall sensors
[22:14:50] <andypugh> OK, saturday night I will add sin-cos output and input to bldc.hall
[22:14:52] <danimal_garage> the encoder versions definitely do
[22:15:08] <danimal_garage> andypugh, don't do it for my case
[22:15:29] <andypugh> No, I am obsessed with making it "complete"
[22:15:47] <danimal_garage> andypugh, what would u use as an output?
[22:15:49] <danimal_garage> DAC?
[22:16:08] <danimal_garage> so i would still need 2 per axis?
[22:16:28] <andypugh> Not my problem, I would just provide sine and cosine output amplitudes on pins for use by PWM or whatever
[22:16:46] <danimal_garage> oh i know its not your problem :)
[22:17:10] <danimal_garage> i'd still need 2 DAC's more or less, huh
[22:17:14] <danimal_garage> per axis
[22:17:20] <andypugh> Mesa PWM into an RC network would work well.
[22:17:53] <danimal_garage> andypugh, i'm not smart enough to build my own circuits.. tried that before and failed
[22:17:59] <danimal_garage> :)
[22:18:18] <danimal_garage> i'd probably just buy another mesa board
[22:18:21] <andypugh> It's 1 cap and one resistor. You can exhaust all toplogical eventualities in 10 mins.
[22:18:38] <danimal_garage> oh
[22:18:45] <danimal_garage> i thought you needed an opto
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[22:25:18] <danimal_garage> well that will be a cool fallback plan
[22:26:03] <danimal_garage> the drives are somewhat picky about the resolver position in relation to the motor spindle
[22:26:10] <danimal_garage> for commutation
[22:30:02] <bill20r3> Has anyone made DIY acme leadscrews+nuts using ike 5-TPI rod? ( or similar "fast" tpi).
[22:35:49] <andypugh> Which part is DIY?
[22:36:20] <bill20r3> Just the nut, I suppose. :-)
[22:36:52] <andypugh> I guess you could make a tap from a spare bit of leadscrew.
[22:37:38] <andypugh> None of it is Rocke Science, the Victorians sorted it all out. That makes it Horse-Carriage Science.
[22:37:53] <bill20r3> I've done that for 12 tpi acme, just wondering if it's been done for 5-tpi 2-start acme.
[22:38:22] <andypugh> Sounds like a great application for rigid-tapping
[22:39:20] <andypugh> I actually have a 6tpi 1.25" OD Acme tap, if anyone wants it. It is LH though.
[22:40:15] <PCW> So you would notch, taper and harden the bit-o-acme screw to make a tap?
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[22:42:15] <danimal_garage> better be a soft nut
[22:42:25] <danimal_garage> unless you can grind the threads
[22:42:27] <andypugh> I would probably skip the hardening and make a delrin nut
[22:42:49] <danimal_garage> or have a hell of a taper on there
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[22:43:56] <andypugh> Alternatively, cast a nut to suit.
http://www.maplin.co.uk/polymorph-35511?c=froogle&u=35511&t=module
[22:45:15] <danimal_garage> or turn one
[22:45:23] <danimal_garage> which would be most ideal
[22:45:53] <bill20r3> yeah, I was thinking of delrin or ptfe for the nut.
[22:46:00] <andypugh> Yes, EMC2 ought to make multi-start and multi-cut threads easy.
[22:46:19] <andypugh> I have done multi-cut.
[22:47:03] <bill20r3> oh, I have polymorph, is it suitable for leadnuts?
[22:47:23] <andypugh> ie, if you consider that a normal threading cycle cuts a triangle, I made a very coarse thread by cutting several triangles in different places.
[22:47:45] <andypugh> (credit where credit is due, it was Cradek's idea)
[22:48:32] <andypugh> bill2or3: It would take about 10 minutes to find out, squeeze a handful round some leadscrew and try to strip the thread.
[22:52:41] <bill20r3> I'll report back if I try it.
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[23:20:13] <danimal_garage> i have discovered that machining a face groove in my fixture and inserting an o-ring so it sticks out a few thousandths past the surface does an awesome job of getting rid of chatter when facing off thin disks in the lathe
[23:20:34] <danimal_garage> just enough damping so it doesnt rattle against the faceplate
[23:21:25] <danimal_garage> the parts are still relatively flat as well (close enough)
[23:22:40] <danimal_garage> :)
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[23:24:53] <danimal_garage> horray for me not only being outstandingly good looking, but also a brain trust
[23:25:04] <bill20r3> it's a win/win, really.
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[23:25:33] <danimal_garage> also extremely modest
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[23:29:18] <andypugh> You have a lot to be modest about, makes it easy.
[23:31:12] <danimal_garage> haha
[23:35:06] <andypugh> danimal_garage: This is you, this is:
http://www.youtube.com/watch?v=tn1Qolv4ntQ
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[23:40:13] <danimal_garage> hahaha
[23:43:14] <Jymmm> danimal_garage: nice scarf
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