#linuxcnc | Logs for 2013-01-26

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[00:19:27] <skunkworks> Feels really nice.
[00:19:35] <skunkworks> heh
[00:24:30] <AR__> has anyone purchased from A2Z before?
[00:25:37] <AR__> i went through their checkout and paid with paypal but did not receive a confirmation or anything
[00:25:57] <AR__> other than a paypal receipt
[00:28:52] <ReadError> yea AR__
[00:28:55] <ReadError> you should be good
[00:29:02] <ReadError> if not call they are pretty nice
[00:29:51] <AR__> are they pretty quick?
[00:29:56] <ReadError> yea
[00:29:59] <AR__> cool
[00:30:02] <alex4nder> they're legit.
[00:30:03] <ReadError> when did you order?
[00:30:11] <AR__> just earlier today
[00:30:14] <ReadError> oh
[00:30:23] <ReadError> might go out monday then
[00:30:27] <AR__> yeah probably
[00:30:28] <ReadError> depending how early you ordered
[00:30:29] <ReadError> actually
[00:30:32] <ReadError> they are still open i think
[00:30:36] <ReadError> give em a call
[00:30:57] <AR__> yeah they are out west i think
[00:31:15] <AR__> i'll just wait till next week to see
[00:31:35] <AR__> i ordered a taig spindle and pulleys :)
[00:31:52] <AR__> got this old treadmill motor running
[00:32:20] <AR__> i think i'm done purchasing the major parts for the machine now
[00:32:22] <AR__> finally
[00:32:29] <ReadError> i was thinkin about using a taig Z axis on my router
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[00:40:52] <andypugh> I am thnking about a scratch-built lathe.
[00:41:10] <andypugh> I have a hankering after a big through-hole.
[00:42:36] <AR__> get taig spindle and lathe chuck
[00:42:47] <AR__> mount it on a piece of iron
[00:42:50] <AR__> ???????
[00:42:53] <AR__> you have a lathe
[00:43:18] <AR__> add a little slide for your tool
[00:43:21] <andypugh> I want something like 3" through the spindle.
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[00:43:27] <AR__> oh
[00:44:01] <AR__> build headstock yourself?
[00:44:07] <AR__> lol
[00:44:16] <andypugh> I have a 2.2kW washing machine motor that looks ideal for direct-drive
[00:44:47] <andypugh> And yes, I am thinking about making patterns and having a casting made for the headstock
[00:45:56] <AR__> you mean belt drive
[00:46:05] <andypugh> No, direst.
[00:46:14] <andypugh> Direct even
[00:47:02] <AR__> who the hell direct drives a lathe?
[00:47:14] <andypugh> Nobody.
[00:47:37] <andypugh> But perhaps they are all wrong and I am right?
[00:47:43] <andypugh> This is the motor: https://picasaweb.google.com/lh/photo/IyoF5obSvIRdd9xn6yIL1NMTjNZETYmyPJy0liipFm0?feat=directlink
[00:48:45] <PCW> Torque rating?
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[00:49:18] <AR__> lol
[00:49:19] <andypugh> I don't know, bit if it can throw a drum of wet washing around, it can't be pitiful.
[00:49:38] <AR__> well, true i guess
[00:50:22] <PCW> I guess the spindle bearing is all you need
[00:50:48] <andypugh> I am not going to build a lathe and hope. I am not _that_ daft. I will jury-rig it to my current lathe first and see how it goes.
[00:51:26] <PCW> if its not enough torque, stack 'em
[00:51:26] <AR__> you can find decent headstocks on ebay for a good price
[00:51:28] <AR__> http://www.ebay.com/itm/Enco-Headstock-Assembly-for-7-x-10-Variable-Speed-Mini-Bench-Lathe-110-0803-/190781632573?pt=LH_DefaultDomain_0&hash=item2c6b78b03d
[00:51:37] <andypugh> I imagine that it will index well though, and be great for the sillly hexagon turning game.
[00:52:17] <andypugh> a) Not Decent. b) Very expensive :-)
[00:52:31] <PCW> may only be 300 RPM or so
[00:53:22] <andypugh> My washing machine spins to 1400, and I think the direct ones are faster, that's part of the point.
[00:54:37] <andypugh> The DSG Headstock i got (from DSG) for a test rig, now that was a decent headstock. :-)
[00:55:56] <andypugh> I wanted a very wide speed range, so got the head from one of these: http://www.lathes.co.uk/dsg/index.html
[00:56:17] <andypugh> Not the way I would do it now. I would be using an AC servo.
[00:56:51] <andypugh> At the time it was a big motor, star-delta contactor and gears.
[00:59:03] <andypugh> At max speed (3000rpm) it was terrifying. There was a 100kg flywheel, and this thing would spool up like a jet engine, getting louder and louder, and just when you thought it was there, it would switch to delta and get even faster. Then I had to click a mouse to engage the pneumatic clutch to drive the cam, so smash the platten and sample into the load cell. 0 to 50mph in 3/8".
[00:59:42] <AR__> lol
[01:00:04] <andypugh> I recall not having the nerve to click the mouse.
[01:01:08] <PCW> Does the washing machine motor have any winding options?
[01:01:46] <andypugh> Looks like straight 3-phase
[01:02:06] <andypugh> 3 pins for the windings, 5 pins for the Halls.
[01:02:39] <andypugh> I will probably hook it up to a 7i39 first
[01:03:18] <andypugh> (as I have a handy generic 7i39 port on the side of my controller, as can be seen in my latest dull youtube video.)
[01:03:30] <PCW> maybe you need another 8I20 (if it works)
[01:04:47] <andypugh> Yes, I am pretty sure I will. Brace yourself for an order :-)
[01:04:53] <PCW> Do you have the peak current specs?
[01:05:22] <andypugh> I can't imagine LG run the motor at less than mains voltage, and I know it is 2,2kW
[01:06:11] <PCW> looks like ceramic magnets, and you would not want to degauss them
[01:08:13] <PCW> although maybe the iron would saturate first
[01:09:47] <andypugh> The whole thing was £27, so it's just a plaything
[01:11:39] <PCW> thats a deal if it works (even if you have to stack 2 or 3)
[01:12:27] <PCW> bbl
[01:12:35] <andypugh> They would be tricky to stack, but not imposible.
[01:13:08] <andypugh> Wow. DSG lathes, even the smallest, 13" model, have a 1.5" dia leadscrew.
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[01:21:47] <archivist> andypugh, I have plenty files, cannot afford those
[01:24:00] <andypugh> I am not sure how big my favourite file is, I keep meaning to measure it as I want more the same size.
[01:26:40] <andypugh> Hmm, probably 16" but I have a feeling it might be 18"
[01:29:19] <archivist> I went out on an ebay collection of a strange item about 5 yrars ago and came back with extras on of which was a box of about 20 files
[01:30:27] <archivist> also get plenty of needle files and rifflers for the small work, also obtained while working as a clockmaker
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[01:35:45] <andypugh> For someone with a set of CNC tools I do seem to spend a lot of time filing.
[01:37:06] <andypugh> It's often much easier to just make something than to design it, especialy when you don't know what yu want until you see it in the metal.
[01:38:09] <archivist> we used files a lot in clock work, nothing is as accurate as it first seems
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[01:41:14] <AR__> lmao
[01:44:52] <andypugh> I spent a fair bit of Christmas adjusting the chime parts of my dad's clock
[01:45:51] <archivist> the ultimate file a clockmaker uses is a pivot file, you can get a burnished polish on a surface
[01:46:11] <andypugh> The basic problem had been that the gap had fallen out between 2 and 3. I had a hard time persuading my dad that 1 and 2 are the same hole, with no gap.
[01:46:54] <archivist> you can use a bit of hss if you grain it with fine wet & dry the right way
[01:47:30] <archivist> yes the wide slot :)
[01:47:43] <andypugh> They basically have no teeth at all?
[01:49:01] <archivist> no teeth just the right grained finish, a touch of oil and press against the surface of the pivot as it is spinning
[01:49:32] <andypugh> Hmm, do I need a sapphire burnisher? I suspect not yet :-)
[01:50:30] <cradek> archivist: a watchmaker with a file can be quite a curse. sometimes he doesn't know that metal doesn't SWELL with age
[01:50:50] <archivist> a bought pivot file does have some teeth one end to go from rough turned to better finish before you use the shiny(user adds his own grain) to burnish end
[01:51:11] <cradek> archivist: usually it's ok unless you give him a repeater or chronograph or something else he's not used to :-)
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[01:51:49] <archivist> cradek, its called "take out the wear" :) but we know how to add metal to the hole in the plate and hide the fill
[01:52:38] <archivist> and one re pivots if a shaft needs it
[01:53:10] <archivist> another art, using small bits of blued steel rod
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[01:54:31] <archivist> some that were rather bad http://www.collection.archivist.info/searchv13.php?searchstr=pivot
[01:55:06] <archivist> the lower one I straightened
[01:56:43] <cradek> wow, those are bad
[01:57:05] <archivist> it is amazing how bad some get
[01:57:16] <cradek> it's amazing it runs long enough for them to get that bad
[01:57:27] <cradek> I guess if you keep adding weight it'll run until one breaks
[01:58:07] <archivist> then you get a smashed clock with some teeth missing and a spring barrel to repair
[01:59:30] <archivist> inserting a tooth or few is where a set of tiny files are required
[02:00:36] <andypugh> Though it would be better to add a dovetail then re-cut to the original cycloidal/involute/octoid form :-)
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[02:01:49] <andypugh> Right, sleep time.
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[02:02:56] <archivist> original form there's a novelty ! some form is only approximate
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[03:01:32] <tjtr33> L84Supper: is 1stime in China? #1 stay cool! Always smile, always calm, Never accuse. Damn hard... find an old expat whos been there a long time to explain.
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[03:22:47] <tjtr33> andypugh maybe the 5pin cnxr uses 4 like in this washer repair manual page 33 http://ww2.justanswer.com/uploads/thehomesmithy/2012-02-19_165402_wpgt9350_sm.pdf
[03:22:52] <tjtr33> very neat motor
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[03:51:32] <dgarr> tjtr33: [06:41:16] <tjtr33> when you have multiple .hal files, and a component of same type in each... well the 1st .hal has to loadrt it (like loadrt or2 count =3), this is kinda ugly, and hides
[03:51:42] <dgarr> see http://linuxcnc.org/docs/html/common/starting-emc.html#_twopass
[03:53:17] <dgarr> there are example sim files in configs/sim/simtcl/twopass_demo.ini
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[03:58:10] <tjtr33> dgarr thx!
[03:59:33] <dgarr> using the names= method is highly recommended for readability and maintenance
[04:00:39] <tjtr33> hx again, that is super info. yes i wanted to use named comps, ended up doing all loadrts in 1st hal and used numbers. this TWOPASS feature fixes that :)
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[04:16:57] <tjtr33> "using the names= method is highly recommended for readability and maintenance" ... and allows adding features by adding a hal file :)
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[05:29:28] <mikegg> evening gents
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[07:50:59] <DJ9DJ> moin
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[09:49:46] <roh> heho.
[09:49:56] <roh> i wonder if this would be a good platform for emc2 http://www.gizmosphere.org/why-gizmo/gizmoboard/
[09:50:16] <roh> seems nice and low power but still should have some gl punch and fast io
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[11:58:07] <Valen> looks like it could be made to work
[11:58:11] <Valen> roh
[11:58:22] <Valen> but i do wonder if there's alot of point
[11:58:39] <Valen> if the GPIO is memory mapped it'd be neat but odds are its through some I/O card
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[12:36:01] <Tecan> would putting a thermal fuse under a laser work well ?
[12:36:16] <Tecan> http://i.imgur.com/Mf4zP5E.jpg
[12:37:03] <Tecan> maybe some steel ontop of it
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[12:38:02] <Tecan> should be a good if it shoots through the workpeice shut off machine
[12:38:26] <archivist> yes/no/maybe/does it need it/dunno
[12:38:47] <Tecan> put some on the motors and ps too
[12:39:00] <archivist> those thermal things are not fast
[12:39:14] <Valen> lasers cut metal
[12:39:17] <Valen> thats made of metal
[12:39:22] <Valen> this seems like a bad plan
[12:39:25] <Tecan> Valen not small ones
[12:39:42] <Valen> also the whole point of lasers as a rule is to pass through the material being cut
[12:39:43] <Tecan> my 40 has a hard time cutting acrylic
[12:42:34] <archivist> steel is also a poor heat conductor, so you will be burning through one part while the thermal cut out is 6" away as cool as a cucumber laughing
[12:44:55] <Valen> what are you really trying to prevent?
[12:49:12] <Valen> if its burning through the tray underneath, most people just put water in it
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[13:08:04] <Loetmichel> Tecan: put a flat trough with blackened water under your workpiece, much safer
[13:08:44] <Tecan> flat through ?
[13:09:29] <Loetmichel> tub, tray, whatever you call it,. solething that can handle 5cm high of water witout dripping and is large enough for the working area
[13:10:16] <Tecan> ya but i want the machine to shut off not evaporate all the water also hv and water dont mix well on a desktop
[13:11:44] <Tecan> i see what your saying though if im going to laze right through something
[13:12:29] <Tecan> safer on the eyes and wont make the machine weigh a ton
[13:13:23] <archivist> the black trough of water becomes a safe heatsink
[13:13:49] <Tecan> activated charcoal
[13:25:44] <Loetmichel> will ignite
[13:26:55] <Loetmichel> Tecan: thats the way to go, even 20kW industrial lasercutter work this way.
[13:27:46] <Loetmichel> there is the water 50cm deep and pitch black and instant boiling about 30cm deep at full power but it works
[13:27:49] <Loetmichel> :-)
[13:29:18] <Tecan> ok so the bottom is black or whats in the water ?
[13:31:25] <Tecan> just so i dont make a mess here :)
[13:34:57] <Tecan> neat they use ruby lasers for tatoo removal
[13:35:10] <Tecan> The Ruby laser is most effective on tattoos with green, blue and black pigments. It is less effective on red, yellow and orange pigments
[13:35:50] <Tecan> wonder what it would take to become a tatoo removal guy
[13:36:35] <jdh> a laser
[13:36:39] <Tecan> lol
[13:37:11] <jdh> http://dx.com/p/tattoo-starter-kit-gun-supply-set-equipment-97087
[13:37:22] <jdh> for $50, you can become a tattoo guy
[13:37:38] <Tecan> yeah that might not look so well unless i could cnc the outline
[13:38:10] <jdh> touch offs could be a problem
[13:38:20] <Tecan> :)
[13:38:46] <jdh> "sorry about your testicles, I thought it was G54"
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[14:04:17] <Tecan> http://www.dumpaday.com/wp-content/uploads/2013/01/funny-wifi-fbi-survelience-van.jpg
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[15:05:44] <Jymmm> Heh http://dx.com/p/mini-aluminum-tattoo-machine-power-supply-110-240v-us-plug-97008?rt=1&p=2&m=2&r=3&k=1&t=1&s=97088&u=97008
[15:07:00] <Jymmm> cute lil variable dc PS
[15:08:19] <Loetmichel> jdh: thats the kind of tatoo guy where you get this: http://www.teamjimmyjoe.com/wp-content/uploads/2012/04/BadTattoosLegDog.jpg
[15:08:21] <Loetmichel> ;-)
[15:09:44] <Jymmm> wth?! lol
[15:11:23] <theos> the dog has 4 eyes! its a miracle... oh wait
[15:11:41] -!- Gabe_W [Gabe_W!~Gabe_W@99-195-115-155.dyn.centurytel.net] has joined #linuxcnc
[15:12:53] <Gabe_W> how do i aquire the *data_ptr_addr from hal shared memory? Is it essential to include hal_priv.h?
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[15:18:46] <Gabe_W> im writing a hal wrapper in cython, and im stuck on that aspecdt
[15:18:51] <Gabe_W> aspect*
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[15:27:22] <micges> Gabe_W: try on #linuxcnc-devel channel
[15:27:52] <Gabe_W> Usually those that are on there, are on here :)
[15:28:27] <micges> true
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[15:32:46] <JT-Shop> what is cython?
[15:33:34] <Jymmm> Cython is a language that makes writing C extensions for the Python language as easy as Python itself. It is based on the well-known Pyrex, but supports more ...
[15:33:59] <Gabe_W> its speeds python code a substantial amount
[15:34:18] <Gabe_W> i only write in it, if im doing complex number crunching or wrapping c code
[15:39:09] <JT-Shop> neat
[15:42:39] <Gabe_W> yeah this is WillenCMD for those that remember
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[15:45:37] * archivist wonders if someone has managed to scan a barber colman manual :)
[15:45:52] <Gabe_W> lol, i should just mail it to you
[15:45:58] <Gabe_W> we have a dozen of them
[15:46:56] <archivist> not that I am restoring it at the moment as it is too damned cold out in the garage
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[15:50:04] <archivist> andypugh, re last nights comment about cycloidal teeth, back in the dark ages even the originals were hand filed and not to any standard, to repair by filing is the right way
[15:50:48] <andypugh> It's the _traditional_ way I will grant you :-)
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[15:54:02] <archivist> andypugh, I mean they were manufactured that way, nothing to do with tradition
[15:54:23] <archivist> before wheel cutting engines
[15:55:19] <andypugh> Well, then, the right way is to accurately measure all the teeth, work out what the average profile was, then make a special cutter to exactly reproduce what the original maker thought a gear tooth should look like :-)
[15:56:12] <archivist> spherical objects, use a file like the ye olde world
[15:57:55] <archivist> dunno if you have seen the characteristics of one done that way, look at the root of the teeth, will have an approx repeating pattern every 5/6 teeth from the filing jig
[15:59:19] <andypugh> I saw a guy making a gear with only a file on a programme about the Antithikera mechanism. It seemed to come out pretty well.
[16:00:15] <archivist> not seen that program yet
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[16:20:55] <archivist> I was searching for broken and non working things on fleabay and found 330859591148
[16:23:03] <Jymmm> lol
[16:26:00] <archivist> I kept it in my watch list to see what happens
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[17:08:17] <Tom_itx> 0 bids?
[17:08:32] <Tom_itx> not even his mom?
[17:08:44] <jdh> she knows better.
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[17:59:13] <IchGuckLive> hi all b9
[18:22:57] <DJ9DJ> hu
[18:23:32] <IchGuckLive> O.O
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[18:45:55] <Tom_itx> i wonder if a washer motor & control unit would make a good spindle motor
[18:48:02] <pcw_home> Any is going to try one on a lathe (and they wont spin very fast)
[18:48:08] <pcw_home> Andy
[18:48:44] <Tom_itx> about 1600 rpm
[18:49:35] <Tom_itx> i wonder how hard they are to hack into the signal
[18:49:48] <Tom_itx> it looks like it's got PWR GND and signal
[18:50:01] <Tom_itx> surely not just simple pwm
[18:50:04] <IchGuckLive> someone knows a good kombination for a stepper motor 400steps/Rotation gear and a rack
[18:50:06] <pcw_home> The controller?
[18:50:10] <Tom_itx> yes
[18:50:20] <pcw_home> serial?
[18:50:26] <Tom_itx> could be, i dunno
[18:50:59] <pcw_home> maybe its just async 9600 baud or some such
[18:51:16] <Tom_itx> i'm gonna give it one more chance as it's life started out then i'll pull the electronics and scrap the rest
[18:51:18] <Connor> http://www.cnczone.com/forums/benchtop_machines/172411-mach_3_vs_linux_cnc.html
[18:51:20] <Connor> Ugg. :(
[18:51:24] <Connor> Stupid people.
[18:51:35] <Tom_itx> replacing bearings in it today
[18:51:42] <Tom_itx> the drum that is
[18:52:30] <pcw_home> 1600 RPM mus be spin cycle
[18:52:42] <Tom_itx> no, that's the motor rating
[18:52:47] <Tom_itx> large pulley on the drum
[18:52:55] <Tom_itx> probably 30:1 or more
[18:53:12] <Tom_itx> maybe not quite that much
[18:53:19] <pcw_home> Oh I thought this was one of those direct drive thingys
[18:53:25] <Tom_itx> about 14" pulley
[18:53:26] <Tom_itx> no
[18:53:34] <Tom_itx> and maybe a 1" or so one on the motor
[18:54:11] <Tom_itx> i wonder if it's 3phase or just a standard dc motor
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[18:55:37] <pcw_home> how many wires?
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[19:00:55] <Tom_itx> i'll have to check
[19:01:13] <andypugh> Tom_itx: The motor I want to experiment with is direct-drive
[19:01:35] <Tom_itx> one of those fisher packyl ones?
[19:01:50] <andypugh> It's a rather large brushless motor: https://picasaweb.google.com/lh/photo/IyoF5obSvIRdd9xn6yIL1NMTjNZETYmyPJy0liipFm0?feat=directlink
[19:01:56] <andypugh> Actually made by LG
[19:02:25] <andypugh> And fairly cheap: http://www.amazon.co.uk/LG-Electronics-Washing-Assembly-4417EA1002G/dp/B0098MM8CY
[19:02:32] <Tom_itx> very similar though
[19:04:41] <andypugh> I reckon if it can throw soggy socks around in a drum then it ought to make quite a lot of torque :-)
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[19:12:06] <pcw_home> torque rating in soggy-socks?
[19:13:18] <Tom_itx> haha
[19:13:32] <pcw_home> have you measured the winding resistance? That will give you an idea of how much current it will take
[19:13:45] <Tom_itx> the manual says it's a 3 phase sync induction motor
[19:13:58] <Tom_itx> with a tach
[19:14:24] <pcw_home> Tom_itx: on yours?
[19:14:28] <Tom_itx> yes
[19:14:48] <pcw_home> so its a 3 phase BLDC servo motor
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[19:15:07] <pcw_home> or PMSM for purists
[19:15:09] <Tom_L> http://adcxns1.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/eab852a13fbc842085256aa200643dd6/$FILE/Duet%20Job%20Aid.pdf
[19:15:13] <Tom_L> P 9
[19:15:55] <Tom_itx> err 3.9
[19:17:08] <awallin> hm so did people DIY the rotors around those stators? with neodym magnets? any good?
[19:18:30] <Tom_itx> pcw_home, P5.4 says it's serial
[19:18:54] <pcw_home> and bidirectional
[19:18:58] <Tom_itx> yes
[19:19:20] <Tom_itx> like an 8bit word for speed and direction?
[19:20:14] <pcw_home> awallin not sure how much you would gain with rare earth magnets if the iron is close to saturation
[19:20:39] <andypugh> awallin: I got the rotor too, original LG part.
[19:20:57] <pcw_home> Hard to guess on a bidirectional one wire protocol
[19:21:17] <Tom_itx> it's probably not 5v either
[19:21:28] <Tom_itx> if it were i could hook my analizer on it
[19:22:05] <pcw_home> Is this a junk washer or just the parts?
[19:22:23] <andypugh> I am not sure what anyone is talking about any more.
[19:22:30] <Tom_itx> i'm still using it but it's on it's last leg
[19:22:39] <pcw_home> two washer motors at once
[19:22:53] <Tom_itx> andypugh i just linked the pdf to mine
[19:23:19] <Tom_itx> i'm gonna give the bearings one more go then i'll scrap it out
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[19:24:36] <pcw_home> If you can spy on its communication you might be able to grok it and use its controller for a spindle control
[19:25:16] <pcw_home> (make sure its isolated from the line!)
[19:26:00] <Tom_itx> that was the hope
[19:26:04] <pcw_home> I would expect its isolated but thats just a guess
[19:27:33] <pcw_home> andypugh: have you measured the line-line resistance on your motor?
[19:28:04] <awallin> so would washing-machine motors make good motors for positioning purposes? (rotary table? direct drive of ballscrew, etc)
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[19:28:55] <Tom_itx> certainly worth a try before scrapping them
[19:29:01] <pcw_home> Possibly, though the have more rotational inertia than purpose built servo motors
[19:29:25] <pcw_home> just add an encoder and you have a AC servo
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[19:44:21] <tjb1> https://www.dropbox.com/s/3aurjmtbnvcvv8r/2013-01-26%2014.40.48.jpg
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[19:48:23] <ReadError> you not get black clips?
[19:49:45] <tjb1> not yet, im gonna go to wally here soon
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[20:15:06] <andypugh> pcw_home: 8.4 Ohms
[20:16:03] <pcw_home> Yeah so it must be something like 1 HP (2.2 KW peak maybe)
[20:17:18] <pcw_home> 10A RMS would be way to much power dissipation
[20:19:20] <andypugh> I doubt it is intended to make much power at low rpm.
[20:19:55] <andypugh> It might be completely useless, but it looks like fun to find out,
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[20:28:24] <pcw_home> so about 3.5A RMS is ~ 1 HP and maybe 100W of heat
[20:29:16] <pcw_home> which should be OK (maybe mount stator on Alu plate?)
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[20:44:34] <andypugh> It's pretty big, 100W sounds like it would stay quite cool.
[20:44:48] <andypugh> There are air-stirrers in the rotor too.
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[20:49:56] <pcw_home> Yeah just dont put 30A through it for very long
[20:50:51] <pcw_home> on the other hand its is mostly open so you would smell the insulation/notice the smoke...
[20:51:52] <pcw_home> you will need to keep magnetic swarf out
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[20:54:06] <andypugh> Yes, some sort of cover is probably in-order :-)
[20:54:29] <pcw_home> I should say dont put 10A though it (nominally 2.2KW) for very long
[20:54:40] <andypugh> I reflashed the 7i73 today. It still works :-)
[20:55:00] <pcw_home> 10A might be a good peak current setting though
[20:55:27] <andypugh> I would probably start even lower than that, and run a thermocouple.
[20:56:52] <pcw_home> Thats good, I still need to flash a different version to make sure its really writing but Im pretty sure it is (since it was writing in the wrong places before)
[20:58:34] <pcw_home> So if you dont have enough torque at low speeds can you help by using the rotor as a handwheel?
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[21:02:35] <andypugh> I guess you could, but part of the motivation was to not have to hand-crank the spindle :-)
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[21:09:44] <pcw_home> is this going to be tested on the lathe you did the hex cutting with?
[21:10:42] <ReadError> tjb1
[21:10:45] <ReadError> get some hairspray
[21:10:59] <ReadError> i got some called 'samy'
[21:11:02] <ReadError> in a blue bottle
[21:11:03] <ReadError> works good
[21:11:05] <ReadError> aerosole
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[21:15:35] <andypugh> pcw_home: Tested. yes. Probbaly not used though
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[21:17:28] <pcw_home> Does sounds interesting for a low speed high torque orientable spindle
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[21:20:11] <andypugh> Not even such low speed, 1400rpm is the washing machine speed. It might run faster with a different controller.
[21:20:44] <tjb1> already back ReadError
[21:20:50] <tjb1> Had to get massive binder clips
[21:22:08] <Gabe_W> tjbl your still here huh?
[21:22:45] <tjb1> Im always here
[21:22:58] <Gabe_W> but your never there
[21:23:07] <pcw_home> Well I mean low speed compared to normal 2 or 4 pole BLDC motors
[21:23:20] <tjb1> Never where
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[21:25:37] <tjb1> Gabe_W: I am everywhere
[21:26:11] <pcw_home> turn over a stone, I am there...
[21:26:24] <tjtr33> andypugh, maybe of use http://www.thebackshed.com/Windmill/Contents.asp they work a lot with those washing machine motors ( tho they use 'em as gnr8rs )
[21:28:17] <tjtr33> i thought the low speed cogging info might be of interest
[21:29:40] <andypugh> Cogging would be a definite drawback if using it in trapezoidal mode, I think it would show in the surface finish.
[21:30:04] <andypugh> I would be wanting to use an encoder and sinusoidal commutation.
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[22:22:27] <DJ9DJ> gn8
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[23:38:49] <JT-Shop> how hard would it be to make and ignitor like this? http://ultimatespudgun.com/30kv-igniter-p-219.html
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[23:52:07] <Tom_itx> what about a grill igniter>
[23:52:11] <Tom_itx> ?
[23:52:24] <JT-Shop> that's what I'm using now but it is not reliable
[23:52:42] <Tom_itx> what about a furnace spark igniter
[23:52:48] <Tom_itx> or stovetop
[23:52:57] <Tom_itx> they 'tick' until they light
[23:53:08] <JT-Shop> those are 120v
[23:53:36] <JT-Shop> mine uses a glow thingy, I don't think the wife will like it if I remove it
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[23:54:15] <skunkworks> tazer?
[23:54:30] <Tom_itx> you want it for your cannons?
[23:54:37] <JT-Shop> tator gun
[23:55:03] <Tom_itx> i doubt you could make one any cheaper than that
[23:55:31] <skunkworks> JT-Shop: I found that adding mulible spark gaps down the center of the chamber really helps speed up the burn.....
[23:55:32] <JT-Shop> I'd bet your right
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[23:56:02] <skunkworks> multiple
[23:56:16] <Tom_itx> find an old model T coil
[23:56:23] <JT-Shop> I read somewhere that having the igntor in the middle is the best for propagation of the flame
[23:56:35] <JT-Shop> to get the highest pressure
[23:56:49] <Tom_itx> or some old magneto setup
[23:57:09] <JT-Shop> I did a mod to mine today and cut a small bevel on the ID and it made the tators seal better with a tad of compression
[23:57:11] <Tom_itx> that probably wouldn't work so good for this though
[23:57:21] <skunkworks> I ran a fiberglass rod down the center of the combustion chamber with 3 or 4 spark gaps in series.
[23:57:38] <skunkworks> it was a substantial improvement...
[23:57:51] <JT-Shop> you using a push button grill ignitor?
[23:58:12] <skunkworks> suspended with a screw on each end which also ran the power in..
[23:58:21] <skunkworks> I did - yes - this was quite a few years ago)
[23:59:47] <skunkworks> I don't remember having much issue with it... But as I say - long time ago. I think I had to pull the spark gap assembly every so often to clean.. (I was using aquanet hair spray)