Back
[00:01:21] <Valen> do needle roller bearings come with an inner race?
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[00:01:59] <andypugh> Some do, some don't. You can generally buy an inner race when they don't
[00:02:15] <andypugh> Quite often they bear directly on the shaft.
[00:02:35] <Valen> hmm, that probably wouldn't work too well for me thn
[00:02:36] <Valen> then
[00:03:05] <Valen> http://www.robowars.org/forum/viewtopic.php?p=79486 is my robot wars robot
[00:03:14] <Valen> you can see there are some issues with the bearings
[00:03:59] <Valen> but a needle bearing wont give any vertical support which is kinda needed
[00:12:16] <andypugh> It's a lot smaller than mine was :-)
[00:13:08] <andypugh> Track Roller bearings are what you want. But I doubt that they exist that small
[00:16:21] <Valen> arent those just normal bearings with a groove cut in the outer race?
[00:18:15] <andypugh> http://www.linearbearings.com.au/Portals/0/Cam%20Followers.pdf
[00:19:19] <Valen> wont handle thrust loads too well though
[00:19:33] <andypugh> Possibly well enough.
[00:20:08] <andypugh> Hardened steel on hardened steel is actually quite a good bearing. It was used a lot in lathe headstocks.
[00:20:43] <Valen> also I want like 6mm ID 12mm OD or so
[00:21:55] <andypugh> They do 4mm stud, 12OD. or 6mm stud, 16OD.
[00:22:35] <Valen> The other thing is i need to have as little friction as possib
[00:22:37] <Valen> ble
[00:22:47] <Valen> so the one with the thrust balls would be needed
[00:24:06] <andypugh> Track Rollers have angular contact bearings:
http://simplybearings.co.uk/shop/p42804/LFR50/8-62Z+Yoke+Type+Track+Roller+with+U+Groove+8x24x11mm/product_info.html
[00:24:24] <andypugh> But I doubt that they exiss small enough.
[00:25:04] <andypugh> Your undelying problem is that if you want to break anything bigger than the bearings, then the bearings will break..
[00:25:31] <andypugh> (Not _exactly_ true, as they are somewhat protected by the mass of the ring)
[00:25:44] <Valen> the theory was that the bearings only need to move the inside of the bot
[00:25:53] <Valen> ~.5kg, vs the ring at ~1kg
[00:27:56] <andypugh> I think it might be worth trying with plain bearings.
[00:28:09] <Valen> thats what I did use
[00:28:13] <Valen> thats what exploded
[00:28:18] <andypugh> Simple bronze bushes.
[00:28:48] <Valen> I thought about those but it'll drastically increase the rolling friction
[00:29:01] <Valen> thats what sets the limit on the RPM and hence weapon power
[00:29:13] <andypugh> Maybe less than you think. It's only an hour on the lathe to find out..
[00:29:20] <Valen> bit more
[00:29:29] <Valen> i need to make a new frame as that one got bent as well
[00:29:55] <andypugh> As an experiment I would say straighten that frame and try bushes.
[00:30:17] <andypugh> Id you need bigger bearings then you will need a different design.
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[00:32:56] <Valen> I was thinking of making a new design anyway
[00:33:13] <Valen> not sure it'll make enough of a difference though
[00:33:13] <andypugh> There are these, but they also lack any obvious thrust capability.
http://docs-europe.electrocomponents.com/webdocs/0bca/0900766b80bca275.pdf
[00:33:56] <Valen> I wonder about making a needle/ball combo and having it inside a roller that interfaces with the ring
[00:34:23] <tronwizard> have you looked into thrust bearings?
[00:34:28] <andypugh> Do you have space?
[00:34:45] <Valen> smaller is better, but I do have some vertical room
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[00:34:59] <Valen> but the bearing can only interface with the ring over a small area
[00:35:14] <Valen> (got to have room for motor stuff on the ring too
[00:36:52] <andypugh> http://simplybearings.co.uk/shop/p556491/NKIA5901+Budget+Needle+Roller+/+Angular+Contact+Ball+Bearing+12x24x16mm/product_info.html
[00:37:08] <andypugh> You probably would need the NKIB patttern.
[00:37:21] <andypugh> I hope you are wealthy.
[00:38:02] <Valen> lol nope
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[00:39:49] <andypugh> To be honest by the time you are up to that size (25 OD x 17 wide) any bearing would probably cope.
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[00:41:34] <andypugh> The trick might be to mount rollers on some form of snubbing mount and have the ring on the rollers. So under no load the ring runs on little mounts, but under shock load the roller movesand takes the load on a solid surface.
[00:42:08] <andypugh> I lost the ability to compile meaningful sentences part way through that.
[00:42:23] <andypugh> Under no load the ring runs on little bearings...
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[00:44:07] <Valen> i know what you mean
[00:44:28] <Valen> we were thinking about rubber mounting the bearings and then letting the ring hit some bushes when it hits
[00:45:19] <andypugh> Same idea as mine, basically. Only simpler and better :-)
[00:45:36] <andypugh> Time to sleep, for me, anyway.
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[01:02:01] <tjb1> JT-Shop: So your thc is activated during piercing too? interesting...
[01:03:09] <JT-Shop> yes
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[01:14:07] <tjb1> How does that work out during the pierce?
[01:17:30] <JT-Shop> how would you expect it to work?
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[01:22:31] <tjb1> Diving when it starts the arc
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[01:25:10] <JT-Shop> guess again
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[01:31:21] <JT-Shop> time to give up and go stop the bleeding...
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[02:15:25] <tjb1> Aww yeah, good guy phone connected to LTE when downloading the new firmware for my iPhone
[02:15:34] <tjb1> 884 MB file in 9 minutes
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[04:40:17] <abetusk> So I think I blew out a stepper motor, but I don't know how I did it. I think I was trying to drive it to fast at one point. It then just stopped working. Does anyone have an idea of why it might have died and how to avoid it in the future?
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[05:21:00] <tronwizard> abetusk: did you rset and drive it at the previous rate?
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[05:26:49] <abetusk> The motor is not even holding position
[05:26:59] <abetusk> I did reset the whole system
[05:27:10] <abetusk> I drove it at a rate that other motors worked at to no effect
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[05:36:14] <tjb1> rooted :)
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[05:52:44] <r00t4rd3d> iphone lol
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[05:57:52] <r00t4rd3d> I laid down a 5pm to take a couple hour nap......
[05:58:02] <r00t4rd3d> 12:30am later....
[05:58:33] <tjb1> r00t4rd3d:
[05:58:36] <tjb1> Rooting is horrible
[05:58:49] <r00t4rd3d> for newbs
[05:58:58] <tjb1> >:(
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[06:22:36] <r00t4rd3d> http://www.youtube.com/watch?feature=player_embedded&v=G_UmhUjZhNo#!
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[06:39:53] <Loetmichel> mornin'
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[07:38:30] <archivist> abetusk, the drives fail if treated badly, the motors hardly ever
[07:39:38] <abetusk> archivist, I've killed a few drivers, so I know they're sensitive, comparatively, but I believe the motor died and I was curious as to how it happened. Mostly so I don't ruin another.
[07:40:38] <archivist> have you swapped drivers over to prove which has failed?
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[07:45:35] <abetusk> yes
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[07:47:42] <DJ9DJ> moin
[07:48:01] <archivist> first thing I would check is the wiring as that fails a lot more often than a motor does
[07:48:31] <abetusk> yeah, thanks. Had I thought of it, I would have measured that already, but that's going to be one of the things I do when I'm next around it
[07:48:56] <archivist> A motor is exceedingly hard to kill
[07:49:10] <abetusk> I figured, yet here I am
[07:50:08] <archivist> have you felt its shaft (rotating it) does it feel the same as another
[07:50:28] <archivist> over current can demagnetise
[07:50:36] <abetusk> I haven't. It's still attached to the axis
[07:51:39] <archivist> is the wiring flexing to that motor
[07:53:14] <abetusk> I've had a motor fail that way, where the wiring frayed where it went into the motor
[07:53:20] <abetusk> I didn't notice it on this one, though
[07:53:26] <abetusk> But then again, I didn't look that hard
[07:55:53] <archivist> I think in here the only steppers that have failed were ones on a high current and old style magnets (like old bridgeports)
[07:56:39] <archivist> and I have been lurking in here for about 5 years
[07:57:36] <abetusk> interesting. I'll check to see if the wires going into it have frayed at all
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[08:00:16] <DJ9DJ> re
[08:00:21] <archivist> loads of people have killed the chinese drives with tb6660 as they are sensitive to abuse
[08:00:29] <archivist> tb6560
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[10:40:12] <las^se> Hi, is there a tutorial or guide on how to setup a 4-axis hot wire cutter with arduino and linuxcnc?
[10:44:06] <archivist> a number of hot wire machines have been made, not sure of any need for arduino
[10:44:59] <las^se> I have arduino, but may go another route? BOB and easy-drivers?
[10:45:14] <las^se> and software control via LPT..
[10:46:44] <archivist> parallel port control of steppers is common
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[10:53:06] <archivist> because linuxcnc is so configurable I am not sure what your question really needs
[10:53:25] <las^se> I'm not sure myself..
[10:53:26] <las^se> heh
[10:54:24] <las^se> I want to make something similar to this:
http://www.foamlinx.com/images/Foamlinx_CNC_hot_wire_foam_cutter_2913_29_inchx13_inch.jpg
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[10:59:04] <archivist> you may want something similar to what this guy did
http://www.youtube.com/watch?v=pMo19ivradQ
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[13:58:50] <las^se> archivist: EMC2Hotwinch in hotwire/linear mode is the way to go, I think. So a 20$ BOB with LPT port between my stepper drivers and PC is enough? Are there other hardware that is required by LinuxCNC?
[13:59:25] <Annie2> hi anyone familiar with arm assember code?
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[14:02:08] <archivist> las^se, probably
[14:02:47] <archivist> Annie2, 10 years ago, you are probably better asking in ##asm
[14:03:15] <archivist> or more like 15 years
[14:03:39] <Annie2> :)
[14:04:29] <Annie2> just curious, is there a tool which can translate x86-64 assembler code for ARM architecture?
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[14:06:47] <Annie2> i have converted zlib for windows-store runtime. for x86, and x64, the conversion went smoothly..
[14:06:56] <Annie2> but in case of ARM, i had to fall back to C code for two performance-savvy functions (longest_match() and inflate_fast() in inffasx64.asm and gvmat64.asm files under contrib\masmx64 folder)..
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[14:07:24] <Annie2> i thought if i could transcode those two assembly files, i could achieve the same level of performance for ARM as well
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[14:11:00] <archivist> I would do it by hand as the two are so dissimilar
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[14:15:12] <Annie2> yeah. would be fun if Intel would have intvented ARM in first place.. there would be some nativity in instruction-set in those two archis
[14:16:29] <Annie2> its almost 400 lines in one file and 550 in other (including comments).. you wana give it a try? LoL :D
[14:22:27] <archivist> luckily I am an ARM free zone these days
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[14:24:57] <jdh> makes it hard to type?
[14:25:49] <archivist> my last job was a printer driver for Acorns Risc PC
[14:27:04] <archivist> acorns own C failed when a switch statement needed to branch more than the ARM chip could at the time
[14:30:52] * skunkworks wonders what is going on
[14:30:56] <skunkworks> logger[psha],
[14:49:42] <Annie2> lol, freem from ARM SoC! they are all around you.. atleast one in everyone's pocket these days. :)
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[16:03:32] <IchGuckLive> hi all
[16:07:07] <JT-Shop> hi
[16:07:35] <IchGuckLive> JT-Shop: did you got notice from bruce
[16:08:04] <JT-Shop> no
[16:08:42] <IchGuckLive> ok
[16:09:07] <JT-Shop> did he email me?
[16:09:31] <JT-Shop> last email was 12/15
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[16:17:47] <IchGuckLive> i do not know he woudt likee to know somthing about toarch kontrol of the Hypertherm 105
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[16:43:12] <r00t4rd3d> http://www.ggandco.com/microtech-usa-solid-titanium-3-edge-twist-jagdkommando-knife/
[16:45:36] <r00t4rd3d> that will moisten the vagina
[16:47:02] -!- mhaberler has quit [Quit: mhaberler]
[16:47:14] <Jymmm> But you'll need viagra @ $1400
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[16:49:06] <r00t4rd3d> Your Price:
[16:49:06] <r00t4rd3d> $999.99
[16:49:25] <Jymmm> still need viagra
[16:49:25] <r00t4rd3d> a steel!
[16:49:54] <Jymmm> no, ti
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[18:09:03] <IchGuckLive> heavy posting today ! Xmas is comming soon
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[18:35:39] <IchGuckLive> hi all
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[19:02:29] <IchGuckLive> one houre no post B) O.O
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[19:15:01] <IchGuckLive> by im off
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[19:40:06] <gene77> Hey guys, I've got a handle on this %$#@ controller!
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[19:55:38] <gene77> Andy?
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[20:05:13] <L84Supper> http://www.sainsmart.com/new-cnc-router-single-axis-3a-tb6560-stepper-motor-drivers-board-for-axiscontrol.html awful stepper drivers
[20:06:38] <Loetmichel> L84Supper: what can onne do to make the TB6560 chips awful?
[20:06:44] <Loetmichel> with the board design?
[20:06:53] <L84Supper> bad board design
[20:07:04] <L84Supper> I think they sent me an earlier rev
[20:07:08] <Loetmichel> i mean: the chips are not really high quality, but awful is another thing
[20:07:40] <L84Supper> poor quality optos as well
[20:07:52] <Loetmichel> optos are overrated
[20:08:23] <Loetmichel> and completly unneccessary if the board designer had connected all grounds regardingless ;-)
[20:08:33] <Loetmichel> (like on mine 4 channel board)
[20:08:34] <Loetmichel> ;-)
[20:08:59] <L84Supper> heh, I think it's the same on this board :)
[20:09:36] <L84Supper> I haven't taken it apart yet
[20:10:08] <L84Supper> http://www.automationtechnologiesinc.com/products-page/kl-stepper-drivers/kl-4030-24-40vdc-3-0a-microstepping-driver behaves much better
[20:10:29] <L84Supper> I haven't pulled the cover to see what they did in here
[20:11:47] <L84Supper> what's the point of isolation if there is no isolation?
[20:11:58] <Loetmichel> right
[20:12:08] <Loetmichel> hmm, maybe overvoltage protection?
[20:13:03] <L84Supper> there is an instructables schematic floating around for the board
[20:13:31] <L84Supper> http://www.instructables.com/file/F94X50TGSUSNA34
[20:14:07] <L84Supper> maybe they are all copying this *brilliant* design?
[20:14:38] <gene77> Being a tech, I did some googling, and that board is universally considered to be excrement
[20:14:39] <L84Supper> 330 ohm isolation :)
[20:15:44] <L84Supper> they should have kept the grounds separate and just added one more pin to the connector, and wallah isolation
[20:15:45] <gene77> Is anyone here using one of Arturo's C41 boards to control an FC250J in the mini-lathe?
[20:17:01] <gene77> I just found the secret forsomething resembling linear response, put a 10k resistor between its analog output and what would have been the pot arm on the FC25J
[20:17:58] <gene77> The darned thing is more current driven that voltage driven.
[20:18:06] <gene77> The darned thing is more current driven than voltage driven.
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[20:56:35] <gene77> Question: Mult2, when fed the same input at both ins, follows the laws of math and does an automatic abs?
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[21:11:39] <tjb1> r00t4rd3d: never again...
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[21:47:16] <r00t4rd3d> what you do now?
[21:47:54] <tjb1> AOKP failed, tried CleanROM which the phone then said I was running a software not authorized by Verizon, then spent another hour trying to get back to stock
[21:53:24] <andypugh> gene77: As far as I know, no automatic abs
[21:53:52] <andypugh> Ah, sorry, I see what you are saying.
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[21:54:02] <andypugh> Well, it will actualy give you the square.
[21:54:16] <andypugh> If you want abs, use the abs component
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[22:05:10] <r00t4rd3d> tjb1, soon you will understand why most Android users stick with the stock firmware and just root.
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[22:06:55] <gene77> THen 2 - values s/b a minus out?
[22:07:29] <andypugh> No, -2 x -2 = 4
[22:07:46] <DJ9DJ> gn8
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[22:09:20] <gene77> Thats what I thought. I just put it back together before I drop a wrench on hot circuit & am headed in to find us a couple of nose bags, thanks
[22:10:07] <andypugh> Do you want a linearisatin curve component?
[22:11:58] <gene77> but that note about a 10k in series with the c41 outout when driving an FC250J in a mini-lathe ought to find its way into the wiki, that helps several buckets worth in gettiung a linear response from the FC250J
[22:12:27] <gene77> That POS is obviously current driven!
[22:13:52] <gene77> I'm outta here for the night, everything but my fuse is working.
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[22:24:08] <r00t4rd3d> I normally blow a fuse or two also.
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[23:48:56] <JT-Shop> plasma modifications done :)
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[23:55:03] <andypugh> I seem to have achieved nothing this evening.
[23:55:26] <andypugh> Ah, well, apart from a new HAL component. That completely slipped my mind :-)
[23:55:58] <andypugh> Perhaps I should say "none of the things I expected to do"
[23:58:59] <JT-Shop> I have those kind of days often... today was different
[23:59:19] <JT-Shop> Rogge solved my gremlin lack of understanding :)
