#emc | Logs for 2011-08-08

[00:01:07] <mikegg> is speed directly proportional to voltage in a BLDC servo?
[00:01:10] <andypugh> In both cases you need to set up the bldc component to interpret the motor feedback and to output the phase/amplitude data in the required format.
[00:01:44] <mikegg> so if this thing is rated at 6000 rpm at 325 VDC, I can take the ratio at 35 vdc to find the max theoretical speed?
[00:02:41] <andypugh> mikegg: Probably. You need to be sure that the commutation is all correct too, and the phase-lead etc.
[00:03:36] <mikegg> hmm. what is phase lead?
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[00:04:26] <andypugh> The angle between the motor rotor magnetic field and the magnetic field of the electrical coils.
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[00:05:38] <mikegg> so is that something I would measure?
[00:05:40] <andypugh> For maximum torque and efficiency you want the armature field to be 90 degrees in front of the permanent magnet field (that's 90 electrical degrees, so 45 physical degrees for a 4-pole motor)
[00:06:03] <mikegg> these are three pole
[00:06:08] <mikegg> I think
[00:06:47] <andypugh> 6 pole, three electrical cycles per physical rotation.
[00:07:15] <andypugh> (pole count is a daft way to describe motors, but its traditional)
[00:07:26] <andypugh> they will be three-phase.
[00:07:41] <mikegg> ahhh, that's what I meant to say :)
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[00:10:08] <andypugh> the bldc component assumes 90 degrees. You can change it, but you would only do that if you were trying to squeeze the last bit of speed out of the motor.
[00:10:36] <andypugh> And you would need to use clever HAL to change the lead angle according to motor speed.
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[00:11:41] <andypugh> The 8i20 applies the angle itself, so needs to see rotor angle on its input pin. The 3pwmgen, however, needs the electrical angle from bldc
[00:13:33] <mikegg> suddenly this seems more complicated than I originally pictured it
[00:14:30] <andypugh> Yes, it came as a bit of a surprise to me when I started to code "bldc"
[00:14:45] <mikegg> heh
[00:15:08] <mikegg> is 3pwmgen available with the 7i43 firmware?
[00:15:16] <andypugh> Yes.
[00:15:29] <andypugh> But you need the _right_ 7i43 firmware.
[00:15:42] <mikegg> i'm running 2.5 pre now.. I don't see the 3pwmgen pins in hal
[00:15:44] <mikegg> ahhh
[00:16:04] <mikegg> i'm using SVST4_4S.BIT
[00:16:42] <andypugh> The correct one probably has 7i39 in the name.
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[00:17:53] <jdhNC> what do you call the outer part of a brushed dc perm. magnet motor (round thingie that the magnets are in)
[00:18:42] <andypugh> the stator
[00:21:16] <jdhNC> that's what I thought, but we must be having a language issue.
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[00:22:10] <jdhNC> "tube/can thing" seemed to get the idea across though :)
[00:23:27] <andypugh> mikegg: Which FPGA soze is your 7i43?
[00:23:43] <mikegg> small one I think
[00:23:44] <andypugh> (size)
[00:23:46] <mikegg> 200k
[00:24:10] <andypugh> In that case, ignore the file I just tried to send you, that's for the big one.
[00:25:06] <andypugh> I am not actually sure what the full set of Mesa firmwares contains at the moment, or how to get them.
[00:32:37] <andypugh> mikegg: sudo apt-get install hostmot2-firmware-7i43-2
[00:33:08] <andypugh> that will get you a TPEN4_5.BIT file which supports #pwmgens
[00:33:23] <andypugh> 3pwmgens, I mean.
[00:33:47] <mikegg> huh, already had that installed I guess
[00:34:31] <andypugh> check the pinout listing in dmesg after loading, it might not actually match the 7i43.
[00:34:49] <tom3p> could an 8254 core co-exist with hostmot2 in one of the mesa cards? http://preview.tinyurl.com/3sy4wzv
[00:36:48] <andypugh> Pete might know, I doubt anyone else will. (Well, Isssy might, but he is offline. He has installed Hostmot2 on non-Mesa boards)
[00:37:08] <andypugh> Anyway, goodnight all.
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[00:38:47] <tom3p> gnite thx\
[00:39:43] <mikegg> night andy, thanks
[01:13:17] <alex4nder> hey
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[03:19:38] <elmo40> hey to you too
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[05:43:27] <Loetmichel> mornin'
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[05:55:06] <nicko> evening
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[09:11:14] <awallin_> check this game out. LOL. http://www.youtube.com/watch?v=B2INvS8IzzY
[09:17:43] <elmo40> awallin_: lol, that rocks
[09:18:02] <elmo40> and you can use a light sabre :P
[09:19:58] <elmo40> http://www.pouet.net/prod.php?which=57427
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[11:37:34] <IG-garage> another day of SHC drilling (sophisticated human-controlled drilling). 315 RPMs, 0.16 mm per revolution, chip brakes from time to time, but dangerous.
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[12:50:04] <IG-garage> oh and 33 mm in diameter drill bit.
[13:02:20] <Loetmichel> *HA!* got my CNC mill lighted up... (ikea rules ;-) -> http://www.cyrom.org/palbum/main.php?g2_itemId=12223 http://www.cyrom.org/palbum/main.php?g2_itemId=12226
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[13:12:05] <IG-garage> i need this to my radial drilling machine. The light from the ceiling is hidden with the console
[13:12:53] <Loetmichel> the lamp costs in germany 9.95 eur
[13:13:13] <Loetmichel> and has a 3W LED with a fine Optic in front
[13:14:11] <IG-garage> i am clamping and drilling steels thingies with ultimate speed, one per 4 or 5 minutes.
[13:14:17] <Loetmichel> so it lights up the workspace in a very evenly distributed circle of light
[13:14:59] <IG-garage> yeah, these lights, they light up dark places, these lights.
[13:15:06] <IG-garage> :)
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[13:17:38] <Loetmichel> IG-garage_ i meant: the light of the lamp isnd a "hot spot" and gets gradually darker but a circle of light with sharp end, and inside the circle are no "clouds", every point is evenly lighted.
[13:17:59] <Loetmichel> very good for seeing little things and scratches
[13:19:31] <IG-garage> Loetmichel: yeah, i can imagine. I myself deal with drill bits 30 or 60 mm in diameter. They have an edge instead of center and I have to use cone in the spindle when I center it.
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[13:51:43] <Loetmichel> hmm, i told a lie: the Lamp costs 9,99Eur, not 9,95 eur: http://www.ikea.com/de/de/catalog/products/50163202
[13:51:54] <Loetmichel> (in germany, anyways)
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[14:06:12] <awallin_> 9,95eur in finland with 23% VAT... http://www.ikea.com/fi/fi/catalog/products/50163202
[14:07:16] <IG-garage> illumination geeks
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[15:22:42] * anonimasu goes on a spree and kills some plc manufacturers
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[15:32:21] * Loetmichel joins anonimasu, cause his micromaster had blown the Fet-modules lately... breaking a little 500W ac motor from 400Hz to 0 in an instant was a bit much witout brake resistor ;-)
[15:33:01] <Loetmichel> 1 sec "DC overvolt" in the display, than BANG
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[15:40:04] <cpresser> Loetmichel: are(were) you using a digital conenction to the micromaster vfd? or analoge control?
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[15:46:19] <Jymmm> Gotta love consistency... http://www.ikea.com/us/en/catalog/products/20169658
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[15:49:45] <cpresser> with the current exchange rates that is cheaper than in europe
[15:49:48] <Jymmm> awallin: is it a good light?
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[16:04:11] <Jymmm> Damn California... http://www.shellseaspoolsandspas.com/title-20-law.php
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[16:08:32] <Loetmichel> cpresser: analog, 'cause the micromaster was SO old it hadnt digital connection
[16:09:38] <Loetmichel> Jymmm: i think so, its grat for spotlight work
[16:09:47] <Loetmichel> but 4 Watts is a lie
[16:09:54] <Jymmm> you have one?
[16:10:02] <Loetmichel> i measured 0,5A plain at 4,0V
[16:10:22] <Loetmichel> http://www.cyrom.org/palbum/main.php?g2_itemId=12223
[16:10:24] <Jymmm> how tall is it?
[16:10:27] <Loetmichel> http://www.cyrom.org/palbum/main.php?g2_itemId=12226
[16:10:44] <Loetmichel> http://www.cyrom.org/palbum/main.php?g2_itemId=12210
[16:11:59] <Loetmichel> ~2 pounds groundplate (China-casted "steel") and a 50cm gooseneck
[16:12:29] <Jymmm> does it seem bright?
[16:12:31] <Loetmichel> the head is about 5cm long and has 3,5cm diameter
[16:13:10] <Loetmichel> it IS bright, even to bright to look in the optics without getting purple stars wandering on your sight
[16:13:24] <Jymmm> does the head get hot too?
[16:13:46] <Loetmichel> but being "only" two watts led, iit is only bright if you are about 10cm to 30cm from your workpiece
[16:14:11] <Loetmichel> it gets hot, but easyly touchable
[16:14:25] <Jymmm> do you think it would be good for sewing machine lighting?
[16:14:27] <Loetmichel> i think somewhere in the 45c ballpark
[16:14:49] <Loetmichel> i think so, if you find a way to mount it without getting in the way
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[16:15:27] <Loetmichel> like i did on my mini CNC mill
[16:15:30] <Jymmm> I'm thinking directly on the wall, but at only 20" long, I'm not sure.
[16:16:29] <Loetmichel> there is a longer version, but thats a lot more costly
[16:16:49] <Jymmm> name/link?
[16:18:14] <Jymmm> This? http://www.ikea.com/us/en/catalog/products/70169694
[16:19:07] <Loetmichel> http://www.ikea.com/de/de/catalog/products/50169690
[16:19:15] <Loetmichel> exactly
[16:19:17] <Loetmichel> ;-)
[16:19:45] <Jymmm> Sadly, there's only a PRTION of it that's flexible, the main section is a fixed tube.
[16:19:49] <Jymmm> PORTION
[16:19:56] <Loetmichel> yes
[16:20:22] <Loetmichel> i think: if the gooseneck is much longer it will collapse under its own weight
[16:20:30] <Jymmm> ah
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[16:34:48] <Danimal_garage> hi
[16:35:03] <JT-Shop> hi Dan
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[17:07:01] <Zencncbuild> somebody here with a 3 axis TB6560 board (china-ebay-thing) ?
[17:07:24] <jdhNC> I have one at home somewhere
[17:07:41] <Zencncbuild> i wonder if i can run a 24v psu on it when using nema17's
[17:07:45] <Zencncbuild> any ideas ?
[17:08:04] <jdhNC> dunno, I used 24, but I had 23's
[17:08:25] <jdhNC> My PSU would turn down to 18v or so, that would probably work
[17:08:52] <Zencncbuild> hmm maybe i can adjust mine too
[17:09:07] <Zencncbuild> havent seen a knob for it yet but.
[17:11:52] <jdhNC> I have 4 or 5, all with adjustment pots
[17:12:14] <jdhNC> you could probably scavenge a 12v for 17's from lots of places
[17:13:19] <Zencncbuild> yep :) hmm i probably have one
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[17:40:46] <Danimal_garage> hi John
[17:48:11] <Tom_itx> top of the monday to ya
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[17:49:03] <Connor> It's normally not the voltage, it's the amperage..
[17:49:39] <Connor> I read something about that, and how to calculate the max voltage of your stepper...
[17:49:47] <Tom_itx> yup
[17:49:48] <alex4nder> 1.21 gigawatts
[17:49:51] <Tom_itx> it's in the wiki
[17:50:13] <Tom_itx> jigawatts...
[17:50:19] <Tom_itx> there is a BIG difference
[17:53:32] <skunkworks_> you know that was just a mis-pronunciation.. They misread 'giga'
[17:53:39] <skunkworks_> as jigga
[17:53:53] <Tom_itx> it's all history now
[17:54:58] <alex4nder> yah, jiggawat.. jiggawho?
[17:56:48] <A2Sheds> not to be confused with a jigger = 44.3602943 milliliters IANAR
[17:58:22] <A2Sheds> does anyone recall seeing a comparison of g-code interpreters? EMC vs reprap and others?
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[18:33:43] <JT-Shop> dang it when you take the jaws out of the vise don't forget to put in a Y offset in your G97 (DX32 control)
[18:35:58] <archivist> machining the body?
[18:37:31] <JT-Shop> I have a small machining hole in the vise now :/
[18:38:12] <JT-Shop> the part is 10" x 22" so to fit it inside the jaws I took them out
[18:42:56] <archivist> just a small wound!
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[18:48:19] <anonimasu> fixed way covers and the paint is done :)
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[18:48:43] <anonimasu> and bearings for z is mounted properly with reatiner ^_^
[18:49:35] <anonimasu> http://ah.io23.net/ul/files/IMAG1579.jpg
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[18:53:24] <JT-Shop> since discovering that the DX-32 has G96/97 fixture offset I find using that to be a more effective and convent way to make mistakes
[18:53:43] <JT-Shop> anonimasu: looking good
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[18:55:29] <anonimasu> just 2 motor mounts left to make, and then assemble it all
[18:55:31] <anonimasu> err 1
[18:55:42] <anonimasu> yeah, and boring the gears
[18:56:47] <anonimasu> im laughing at practicalmachinist, they are talking about how big a tenth is..
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[19:05:58] <Danimal_garage> jt-shop: how's the trike research going?
[19:06:35] <Danimal_garage> do you think that bike can push the extra weight of a trike rear end safely?
[19:07:03] <Danimal_garage> that's a ton of extra unsprung weight
[19:13:20] <Danimal_garage> cool, just ordered some tooling plate for my engraving machine
[19:13:40] <Danimal_garage> once i make that, it's pretty much ready to run
[19:19:13] <alex4nder> Danimal_garage: what plate did you go for?
[19:20:39] <Danimal_garage> probably just some k100, i'm not sure
[19:20:50] <Danimal_garage> precision cast aluminum tooling plate
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[19:23:06] <alex4nder> Danimal_garage: I've been looking at buying one of A2ZCNC's mic-6 plates for my taig, seems like a nice tool
[19:24:37] <Danimal_garage> wow this spot welder i got is badass
[19:24:56] <Danimal_garage> cleaned out this guy's garage for him, scored a ton of old tools
[19:25:22] <Danimal_garage> mic-6 is decent, pretty close to the stuff i ordered
[19:25:36] <Danimal_garage> i just ordered the material, i'll make the plate myself
[19:26:38] <alex4nder> yah
[19:27:19] <alex4nder> anyone got an opinion on interapid vs. compac vs. bestest dial test indicators? they're all made by tesa, but I'm not sure which one I'm going to buy
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[19:36:50] * anonimasu yawns
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[19:50:01] <awallin> alex4nder: mitutoyo
[19:53:23] <archivist> they all wear out and get sticky
[19:59:07] <alex4nder> awallin: thanks
[20:01:07] <anonimasu> awallin: im reading the paper a bit
[20:01:14] <alex4nder> I just bought a bestest
[20:02:15] <anonimasu> awallin: looks like either interpolation method would work like taylor polynomials
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[20:08:38] <anonimasu> awallin: im thinking about how to apply this to a queue of segments and how that would work
[20:09:27] <anonimasu> awallin: write me when you are here.
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[20:12:31] <anonimasu> awallin: the paper makes sense, but how do you actually implement something like this algorithmically is what im really wondering hard about
[20:13:04] <JT-Shop> Danimal_garage: I'm looking at a Ford 7.5" rear axle now... seems to be the smallest
[20:16:39] <JT-Shop> looks like chevy has 7.5" differentials too
[20:17:01] <anonimasu> awallin: also, use of a algoritm like that requres it to be fed nurbs data and control points
[20:17:19] <anonimasu> awallin: and that kindof adds the need of a pre-processor for g-code to fit nurbs to that
[20:18:36] <JT-Shop> looks like a Dana 30 is even smaller at 7.2"
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[20:21:58] <Tom_itx> Ford 9" FTW
[20:24:39] <JT-Shop> maybe on a 1200cc bike but not a 250cc bike
[20:26:11] <A2Sheds> is this for one of those toilet seat vehicles? http://images59.fotki.com/v111/photos/7/42477/9690776/59trike-vi.jpg
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[20:29:36] <JT-Shop> same but different
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[20:30:18] <A2Sheds> what we called them back then
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[20:32:58] * Tom_itx paints a snowcone on the side
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[20:49:52] <JT-Shop> http://www.therangerstation.com/tech_library/diagrams/expaxle.GIF
[21:00:28] * JT-Shop really should get the chainsaw out and cut up the dead tree that fell down last night in the storm...
[21:01:03] <anonimasu> what are the general requirements for spindle synchronized motion?
[21:01:07] <anonimasu> how many million ppr do i need?
[21:08:21] <A2Sheds> how many microarcseconds of res are you shooting for?
[21:08:45] <anonimasu> I have a encoder disc already from the original lathe, it's going to go away and be replaced by a encoder someday in the future
[21:09:11] <anonimasu> it's got a single index, and one channel
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[21:10:07] <anonimasu> or i can take my 5000ppr heidenhain encoders i have at work for some sevos ;)
[21:10:53] <JT-Shop> my hardinge has 4000ppr I think on the spindle
[21:11:34] <anonimasu> but then I need support bearings for it
[21:11:35] <anonimasu> :/
[21:15:12] <anonimasu> 96 ppr by default
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[21:25:35] <A2Sheds> any opinions on who makes the highest accuracy linear bearings and guides for small loads (few kg) speeds to 1G?
[21:30:28] <A2Sheds> travels 300mm - 2m
[21:34:28] <Danimal_garage> JT-Shop: have you tried riding with a passenger on that bike?
[21:34:29] <archivist> speed to 1G what giga nanometers per day?
[21:34:57] <Danimal_garage> i suspect it'll struggle about the same
[21:41:57] <A2Sheds> heh accel/decel to 1G
[21:42:34] <Connor> can someone explain how to power tap using a manual mill ?
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[21:42:49] <jdhNC> with a tapping head
[21:42:49] <archivist> get a tapping head
[21:43:33] <syyl> if you have a quill
[21:43:39] <archivist> it has gears and an auto reverse when you pull out
[21:43:42] <syyl> and can reverse the spindle
[21:43:48] <syyl> you dont need a tapping head
[21:44:22] <archivist> or use a herbert type which opens the jaws on reverse pull
[21:44:31] <skunkworks_> work of art... http://www.electronicsam.com/images/house/pizza.JPG
[21:44:38] <archivist> or mill the threads
[21:44:52] <JT-Shop> Danimal_garage: no just by myself, I did plan on lowering the rear sprocket by a couple of teeth as it struggles in 5th on hills
[21:45:12] <JT-Shop> woops I mean increasing it a few teeth
[21:45:43] <Danimal_garage> JT-Shop: just thinking it might be easier to sell it and buy a shaft drive bike with a few more cc's
[21:46:15] <andypugh> Shaft drive bikes have very few advantages, and certain disadvantags.
[21:46:16] <JT-Shop> then you have to find an offset rear axle...
[21:46:18] <Connor> No tapping head...
[21:46:21] <Connor> only way to do it?
[21:46:31] <syyl> no
[21:46:36] <JT-Shop> use a cordless
[21:46:46] <syyl> can you reverse the milling machines spindle rotation?
[21:46:51] <Connor> yes.
[21:46:51] <andypugh> Aye, I use my cordless drill to tap holes all the time.
[21:46:58] <syyl> then you have all you need
[21:47:03] <syyl> drill
[21:47:07] <syyl> change to a tap
[21:47:10] <syyl> low speed
[21:47:16] <Danimal_garage> not really John, just shorten it a little more on one side
[21:47:17] <Connor> how do you keep from stripping when it bottoms out?
[21:47:29] <syyl> ah, bottom hole?
[21:47:35] <archivist> Connor, http://www.youtube.com/watch?v=Jbp8SJ9RxqI
[21:47:50] <syyl> make a mark with a sharpie on the tap
[21:48:05] <archivist> Connor, tapping heads have friction drive to avoid breakage
[21:48:16] <syyl> feed it in by hand, stop, reverse
[21:48:27] <syyl> works like a charm
[21:48:31] <syyl> no need for a tapping head
[21:48:40] <syyl> at work we do this on a large drill press
[21:48:55] <syyl> (there is the reverse via a foot-switch)
[21:49:08] <archivist> note how long it takes for the mill to stop, bottom is too late to be thinking must reverse
[21:49:11] <Danimal_garage> JT-Shop: an extra 150lbs, especially in rolling eight, is going to make a major impact on the ability to get up to highway speeds
[21:49:17] <Danimal_garage> weight*
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[21:49:34] <Danimal_garage> small displacement+extra weight=no bueno
[21:49:38] <syyl> or just reverse the mill, without stop
[21:49:56] <JT-Shop> yea, I'm not expecting too much in the performance department
[21:49:56] <syyl> that will generate minimal overrun
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[21:50:56] <andypugh> Extra weight doesn't really affect speed, just accelleration. Increased aero might have a more significant impact.
[21:50:58] <Connor> can't reverse without stop.
[21:51:03] <archivist> one of mine takes time to reverse, even with the vfd controlling it
[21:51:21] <andypugh> Oh, by the way, I just got back from an evening in London meeting up with Viesturs and his girlfriend.
[21:51:24] <syyl> our drill press just changes the phases of the motor
[21:51:43] <syyl> a bit lout
[21:51:48] <syyl> but instant-stop ;)
[21:51:55] <JT-Shop> it will affect speed on hills I assume but I'm thinking 50-60 mph might be top speed
[21:52:00] <syyl> (instant-reverse)
[21:52:16] <Danimal_garage> andypugh: with a 250cc bike, it will definitely make an impact on the ability to maintain highway speeds
[21:52:35] <archivist> I used to do that with a swiss lathe for tapping but the tap was hand held in a chuck so it could slip
[21:52:44] <andypugh> A 250 should manage 80, mine did and it was very tired.
[21:53:03] <JT-Shop> I don't think she will drive it more than a couple of miles on the highway to get to a side road to ride on
[21:53:08] <A2Sheds> maybe with an 8 speed transmission
[21:53:27] <andypugh> "highway speed" in the US is 55mph isn't it? You can do that on a 100cc.
[21:53:40] <JT-Shop> this one on flat ground will do 70 with no problem with me sitting up
[21:53:53] <JT-Shop> 75 in a lot of places now
[21:54:20] <A2Sheds> minimum is generally 45mph
[21:54:39] <A2Sheds> before they ticket for moving too slow
[21:55:28] <archivist> Connor, by the way use proper machine taps under power
[21:55:36] <andypugh> Is it just me, or is this very wrong? http://www.avsforum.com/avs-vb/showthread.php?t=950411
[21:56:40] <archivist> inlet is a plug, that is correct
[21:57:05] <andypugh> The first message calls it a reverse/male outlet
[21:57:37] <Danimal_garage> If you're not doing 80mph here, you'll get ran over
[21:57:40] <archivist> well, language challenged user, I know :)
[21:57:42] <A2Sheds> supply from a UPS
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[21:58:33] <andypugh> OK, so UPS power goes in to there to power stuff? Is that not live when mains power is on?
[21:59:38] <archivist> yes thats what he wants
[21:59:53] <A2Sheds> maybe he wants to avoid using a transfer switch with his UPS? The plug in the wall will fool the power so it will only flow the correct direction :)
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[22:00:18] <archivist> if live its covered by the flying lead socket feeting it
[22:00:28] <archivist> feeding
[22:01:21] <archivist> a ups on a tv is a bit over the top though
[22:01:57] <A2Sheds> just the essentials, TV, beer cooler
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[22:04:13] <A2Sheds> I keep the cable box on a UPS since they designed it so poorly. The HD gets corrupted if it was recording when the power dies. I guess they thought using a journaling files system would cost more
[22:05:36] <andypugh> Curses! I have made my parts based on an extra-rare and extra-expensive needle roller bearing. 15 x 22 x 15 = £8.05. 15 x 21 x 16 = £2.31
[22:07:38] <archivist> yup design means check prices early on @)
[22:09:32] <Tom_itx> so long as you left enough material for the cheap one you're good
[22:09:52] <andypugh> No, I already made the 22mm bore.
[22:10:03] <archivist> shims!
[22:10:32] <Tom_itx> meh, knurl it
[22:10:33] <Tom_itx> :D
[22:11:18] <syyl> loctite!
[22:11:24] <archivist> its fun turning 3 thou thick shims
[22:11:33] <syyl> also known as chemical press fit
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[22:16:55] <Tom_itx> since you have to make another one anyway, try shrinking the metal
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[22:17:25] <Tom_itx> heat it up good and hot and quench it
[22:17:39] <andypugh> That's a bit special, an ordering page which has drop-down boxes for billing country and delivery country. Except billing has "United Kingdom", and Delivery has "England"
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[22:17:48] <Tom_itx> you won't gain a mm though
[22:18:01] <andypugh> It's cast-iron.
[22:18:10] <Tom_itx> o
[22:18:12] <andypugh> Anyway, I found the right bearing for £5
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[22:23:23] <elmo40> how much should a 3' long 1"dia ballscrew go for. with end bearings
[22:23:43] <Tom_itx> should or does?
[22:23:55] <Tom_itx> prolly $150-200
[22:25:44] <elmo40> brand new?
[22:25:55] <elmo40> with end bearings?
[22:26:20] <Tom_itx> just a guess
[22:26:20] <elmo40> l
[22:26:20] <elmo40> k
[22:26:22] <archivist> also depends who makes it could be a lot more
[22:26:27] <A2Sheds> http://www.rockfordballscrew.com/ online pricing
[22:26:33] <archivist> and what grade
[22:26:54] <Tom_itx> http://www.pbclinear.com/
[22:28:40] <Tom_itx> or ebay
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[22:31:28] <A2Sheds> http://www.nookindustries.com/ball/BallHome.cfm on Amazon as well
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[22:34:37] <A2Sheds> I've been finding less and less on ebay
[22:35:27] <A2Sheds> I see old stuff that was there last year or parts without part numbers or an accurate description
[22:37:04] <syyl> i dont buy linear motion components on ebay anymore...
[22:37:10] <syyl> got crap two times
[22:37:51] <syyl> not like the "perfect condition" mentioned in the text...
[22:39:45] <A2Sheds> I bought 2 parker ball screw positioners with cables and controllers marked "NEW", they showed up USED and one was damaged by UPS, the servo was hanging by the last bent fastener
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[22:40:37] <A2Sheds> it bent the botor shaft just enough to make the optical encoder rub against the detector for 1/8 turn
[22:40:45] <A2Sheds> botor/motor
[22:42:00] <syyl> not good
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[22:55:39] <A2Sheds> http://www.microfluidicmachines.com/Pro%203%20nano.htm 0.8 micron resolution with ball screws
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[23:07:48] <A2Sheds> this guy was able to get sub-micron results from his DIY mill http://bbs.homeshopmachinist.net/showthread.php?t=38158
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[23:08:24] <A2Sheds> even with steppers and ballscrews
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[23:28:58] <Jymmm> SWPadnos: Don't you just WISH SoCal always looked this awesome... http://www.flixxy.com/twilight-landing-los-angeles-airport-cockpit-view.htm
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