#linuxcnc | Logs for 2014-08-27

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[00:08:13] <anarchos2> I'm a bit confused at to where the gmoccapy config files are stored?
[00:08:36] <anarchos2> It works and everything, but the wiki keep talkign about gmoccapy specific hal files which i can't find...
[01:58:09] <anarchos2> camview-emc with debian wheezy....should i try the squeeze repo?
[02:01:52] <Deejay> moin
[02:03:56] <anarchos2> hi
[04:12:06] <James628> Anyone could help with plasma questions?
[04:51:46] <SolarNRG> Can anyone give me some input on this linear rail/ linear bearing design I'm working on? I want to optimize the design before I begin cutting, drilling and welding: http://i.imgur.com/KJw9ftO.jpg
[04:53:44] <SolarNRG> I done the basics in blender, measured up the pulleys so they just touch the pipe so I can drill the holes as accurately as possible to eliminate clatter from gaps between the pulleys and the pipe
[05:32:01] <archivist_herron> I dont think he realises how springy those roller mounts are
[05:38:02] <ReadError> why the hell would he use blender of all things lol
[06:02:22] <archivist_herron> noobs dont know better
[06:30:35] <jthornton> I don't think he will ever build it
[06:53:12] <archivist_herron> did he finish his solar steam generator?
[07:43:59] <skunkworks> neat
[07:43:59] <skunkworks> https://www.youtube.com/watch?v=VTU2Eyr6MuY
[07:53:49] <SpeedEvil> Probably easier just to get a dot matrix printer
[08:00:53] <skunkworks> hater!
[08:09:06] <cpresser> skunkworks: how did you find that video? i would like to see the software involved :)
[08:09:24] <skunkworks> just searched youtube..
[08:19:23] <SpeedEvil> Standard laser-cutter stuff
[08:19:50] <SpeedEvil> you just generate an image, then rasterise
[08:20:05] <SpeedEvil> Could even convert it to gcode
[09:19:39] <anarchos2> mornin'
[09:31:33] <ssi> aw he left
[09:31:48] <ssi> I have raster engraving working on my laser, which is controlled by linuxcnc
[09:32:46] <anarchos2> do you have it setup so you import rasters directly into linuxcnc?
[09:32:51] <ssi> yeah
[09:32:56] <anarchos2> or do you do raster->gcode in some other program?
[09:33:16] <ssi> there's an M-code which is a python script and it reads the images directly
[09:33:29] <ssi> I didn't write it; I found someone else's project
[09:33:38] <skunkworks> ssi, have you tried it?
[09:33:41] <ssi> yep
[09:33:46] <skunkworks> cool
[09:34:45] <anarchos2> sickter. my package from cnc4pc has arrived at the post office.
[09:34:56] <anarchos2> only 44 more minutes until they are open :P
[09:35:59] <ssi> I ordered a 100W RECI tube and psu yesterday
[09:36:04] <ssi> I wonder how long it'll take to get here :P
[09:36:34] <ssi> hasn't shipped yet :P
[09:36:51] <anarchos2> i also ordered a touch plate from ali express for $7
[09:36:56] <anarchos2> wonder how long that will take :P
[09:37:09] <ssi> haha there's no telling :)
[09:39:43] <CaptHindsight> Now, you to can enter the exciting world of laser headstone engraving https://www.youtube.com/watch?v=3OfJdKWuMIg
[09:39:54] <anarchos2> i need to find a cheapo webcam that will work with camview-emc on aliexpress, too
[09:40:06] <ssi> CaptHindsight: I'd have to build a stronger table :P
[09:41:37] <ssi> I wonder how much power it takes to engrave polished granite like that
[09:42:08] <SpeedEvil> Granite flakes easily at ~400C
[09:42:19] <SpeedEvil> It changes phase massively and spalls
[09:42:36] <ssi> probably could do it with 40W then
[09:42:53] <ssi> especially with my 1.5" lens
[09:42:56] <SpeedEvil> http://www.stonesurfaces.ca/4-surface-finishes.html
[09:42:59] <SpeedEvil> see 'leathered'
[09:43:02] <ssi> it's 8kw/mm^2 with that lens
[09:43:06] <SpeedEvil> Leathered NEW! Leathered
[09:43:06] <SpeedEvil> "Leathering" is the process of texturing granite or marble to appear less glossy. This process amplifies the natural characteristics of granite or marble, resulting in an exquisite surface. It is easy to clean and maintain, as well as, pleasing to the touch - a perfect balance between style and practicality. A leathered countertop is a fresh and innovative way of adding a subtle elegance to your decor.
[09:58:17] <Jymmm> I just got a call on my cellphone from a 786 area code. DONT ANSWER/RETURN CALL, it's a scam… http://www.consumer.ftc.gov/blog/one-ring-cell-phone-scam-can-ding-your-wallet
[09:58:55] <PetefromTn_> Lovely isn't it..
[10:01:40] <SpeedEvil> Some people need a plunge-cut with a large end-mill.
[10:02:49] <Jymmm> and some just need to BE the endmill
[10:04:52] <PetefromTn_> I'm thinkin' a big facemillin' LOL
[10:07:50] <cpresser> some ppl need a high-five. in the face. with a chair
[10:14:20] <ssi> I got a scam call the other day from someone claiming to be an IRS officer with a warrant for my arrest for tax evasion
[10:15:08] <PetefromTn_> jeez.. Lately I have been getting emails from Russia about my winning a great deal of money LOL..
[10:15:36] <pcw_home> no Russian bride ones?
[10:15:45] <PetefromTn_> Nope not so far LOL
[10:15:51] <PetefromTn_> would not surprise me tho.
[11:03:01] <JT-Shop> PetefromTn_, what did you find out about your spindle bearings?
[11:09:39] <PetefromTn_> JT-Shop Well thanks for asking man. Honestly I found out that they are angular contact bearings single row. They are sold as matched pairs even tho they are not utilized as such. I found that they were made in England and the company that created them is not longer in business but has been bought out by NSK. I also found out the the GODDAMN THINGS ARE FRAEKIN' EXPENSIVE!!
[11:09:40] <PetefromTn_> ;)>
[11:09:40] <jdh> those are spindle bearings or motor bearings?
[11:09:40] <PetefromTn_> spindle motor bearings
[11:09:40] <jdh> I thought the spindle was good
[11:09:40] <PetefromTn_> spindle is good
[11:09:40] <jdh> belt drive?
[11:09:40] <PetefromTn_> local price I got for the pair was about $425.00
[11:09:40] <PetefromTn_> yeah belt drive.
[11:09:40] <jdh> do they feel/sound bad?
[11:09:40] <PetefromTn_> Yeah they are smoked.
[11:10:04] <PetefromTn_> the top bearing is the worst.
[11:12:44] <zeeshan> PetefromTn_: is there a part number on the bearing?
[11:12:46] <CaptHindsight> PetefromTn_: do you have specs or part numbers?
[11:12:59] <PetefromTn_> sure went over it here yesterday LOL Standby
[11:13:39] <CaptHindsight> B7306X2 Taul
[11:14:12] <PetefromTn_> Bottom Bearing is B7209X2 TAUL EP7 Top bearing is B7306X2 TAUL EP7 bottom bearing measures 85x45x19 and Top bearing Measures 72x30x19.
[11:14:42] <CaptHindsight> http://www.vxb.com/page/bearings/PROD/Kit10030 looks like a fit for the top
[11:15:00] <JT-Shop> $425 doesn't sound bad for 12k rpm bearings
[11:15:21] <PetefromTn_> Nope already been there these bearings are needing to be rated for 12k in grease or more..
[11:15:25] <JT-Shop> does your spindle go 12k or just the motor?
[11:15:37] <PetefromTn_> Motor 12k spindle 6k
[11:16:28] <jdh> 9k is close to 12k
[11:16:43] <jdh> buy 2, see what happens.
[11:17:00] <jdh> if one goes bad, swap in the other and buy the expensive ones
[11:17:26] <PetefromTn_> LOL I wish it was man....believe me I wish it was. Trouble is I have parts to make and unfortunately I don't have the cash to buy them right now DOH!
[11:18:06] <JT-Shop> oh that sucks
[11:18:08] <CaptHindsight> PetefromTn_: what are the current part numbers SKF gives you for those 2 bearings?
[11:18:19] <PetefromTn_> no idea man...
[11:18:48] <PetefromTn_> and yes it does suck magnificently.
[11:19:20] <CaptHindsight> http://www.amazon.com/S7306B-30x72x19-Angular-Contact-Bearing/dp/B00DV5YWQE
[11:19:45] <CaptHindsight> http://www.wychbearings.co.uk/7306bep_skf.html
[11:19:51] <jdh> do you usually run your spindle 4500-6000?
[11:19:53] <zeeshan> why are qctp parting blade holders at such an agressive angle? http://shopimages.toolsnz.com/TNZ00255.jpg
[11:20:31] <CaptHindsight> what type of seal do the bearings have and what tolerance do you want to pay for?
[11:21:37] <PetefromTn_> No actually I don't but that is mostly because I have been trying to limp it along until I could buy the new bearings. The spindle motor has been kinda noisy since I bought the machine.
[11:21:51] <CaptHindsight> http://www.wychbearings.co.uk/7306begbp_skf.html#product_tabs-1 htis spec says 13,000 rpm, but I need the SKF decoder ring to read the part number
[11:23:23] <PetefromTn_> Not sure how to get that information but that price is certainly better than the $229.70 I was quoted for the SMALLER BEARING.
[11:23:55] <CaptHindsight> http://www.skf-bearing.cc/SKF-bearings/SKF_7306_BECBM___2212.html
[11:25:02] <CaptHindsight> it's the letters after the 7306 that determine the type of seal and grade
[11:27:27] <CaptHindsight> http://www.skf.com/us/system/SearchResult.html?search=7306
[11:27:55] <James628> JT-Shop May I ask a question about the parport driven plasma-demo.hal?
[11:29:30] <jthornton> sure
[11:29:36] <James628> JT_Shop I couldn't find the parport pin where the THCAD output (voltage converted to frequency) should be connected. Or did I misunderstand something?
[11:30:15] <jthornton> well if it is a demo then no hardware is used
[11:33:02] <PetefromTn_> These are made by RHP in England they are basically single row abec7 high speed precision bearings.
[11:33:03] <PetefromTn_> The local bearing guy that quoted me the prices I stated earlier said the NSK part number is the same as the RHP part number I stated earlier but the TAUL is actually now TADUL..
[11:33:42] <James628> OK, then demo is not for real hardware. I have latency below 8000. Is it worth a try to use parport or waste of time?
[11:35:07] <jthornton> a good question for Peter... but IIRC you can set the multiplier jumper on the THCAD and use the parallel port
[11:36:16] <James628> JT-Shop BTW the README says about touchtest.ngc, but that's missing . Not a big thing but documentation could be improved.. :)
[11:38:05] <jthornton> I welcome any improvements to the documentation
[11:38:19] <James628> JT-Shop tomorrow I want to by a plasma cutter (lower budget one) What is the minimum requirement regarding signal from/to the cutter? Arc OK, Trigger or can I go without them too?
[11:38:28] <pcw_home> you can, the tradeoff is that the frequency resolution will be limited by the basethread rate,
[11:38:30] <pcw_home> which means you need to use the lowpass component, and this will limit how responsive the
[11:38:31] <pcw_home> Z position loop can be to height variations
[11:39:14] <jthornton> I ran my plasma for a while by pulling the trigger and using a stick to press the r button
[11:39:39] <James628> JT-Shop Can I somehow contribute to the improvement in this case?
[11:40:12] <CaptHindsight> PetefromTn_: I often found the exact pricey bearing on amazon for a fraction of the price, but there is usually only one bearing available at the low price
[11:40:15] <jthornton> yep you can send them to me
[11:40:58] <jthornton> I've seen setups where a solenoid pulls the trigger on a hand torch
[11:41:13] <James628> PCW thanks for the hints. I'll try and if no success I'll come back for support.
[11:41:16] <jthornton> I now have a machine torch with full interface
[11:41:37] <jthornton> I've also cut for quite some time without any THC
[11:42:04] <jthornton> until I twisted Peter's arm enough to make some :)
[11:42:13] <James628> JT-Shop, I'll send you the details for correction to your e-mail addr.
[11:42:26] <PetefromTn_> yeah I know and the single bearing is actually fine because the only time bearings are mated paris is when they are setup back to back. Not the two ends of an armature shaft.
[11:42:27] <jthornton> ok
[11:46:28] <James628> JT-Shop that sounds good, so simple cutters can also be used just they are not so convenient in use without those CNC features built in
[11:50:54] <JT-Shop> aye, the limit is flat material
[11:51:06] <JT-Shop> are you building a plasma cutter?
[11:59:50] <James628> JT-Shop YesI am bilding plasma cutter
[12:02:31] <James628> JT-Shop I want floating head, I have Mesa THCAD-10 and 7i43 or 7i90 will be used later for encoding
[12:05:24] <JT-Shop> have you seen my plasma cutter?
[12:05:59] <JT-Shop> I did start with a machine capable plasma cutter so I would not have to purchase that over again
[12:06:37] * JT-Shop finally got a roundtuit and cleaned the chip tray on the Samson
[12:09:58] <James628> JT-Shop Sure I studied your plasma, both the pictures/video and the config files
[12:19:31] <JT-Shop> the biggest mistake I made was not planning for a water table during my initial build
[12:25:01] <James628> I am planning water table ... :) from the beginning..
[12:25:56] <ssi> my plasma table is mostly running really well
[12:26:03] <ssi> I need to fine calibrate the squareness
[12:26:09] <ssi> both gantry squareness and torch-to-work squareness
[12:27:54] <ssi> fwiw, I've pretty well solved all the dual-homing gantry issues in joints_axes
[12:37:56] <JT-Shop> cool
[12:58:26] <alexchally> so I am trying to reverse the Y axis motion on my machine, but when I put a negative value for input and output scale on axis 1, axis 0 faults when I move it
[12:58:28] <alexchally> thoughts?
[12:58:47] <anarchos2> http://cnc4pc.com/Tech_Docs/A32R2.JPG
[12:59:20] <anarchos2> so basically that's saying when the switches are not touched, there will be continuity on pins 2,3,4 (+7)
[13:00:01] <Rab> anarchos2, that's correct.
[13:01:13] <anarchos2> and when the switch is pushed for lets say Y- or Y+, only pins 2 and 4 should be active
[13:01:27] <Rab> Also correct.
[13:02:08] <anarchos2> so X+ and X- should be pins 2 and 3
[13:02:32] <anarchos2> and Z+/- as 3 and 4
[13:03:52] <Rab> anarchos2, I don't follow.
[13:04:59] <anarchos2> i'm trying to figure out where the error is in my (pre-made) limit/home switch wiring harness
[13:05:14] <anarchos2> because X+ doesn't work :(
[13:06:24] <Rab> Your description (X+ and X- should be pins 2 and 3, Z+/- as 3 and 4) doesn't seem to match the diagram. Is that how your switches are connected?
[13:07:14] <anarchos2> no
[13:07:19] <anarchos2> well, maybe.
[13:07:31] <anarchos2> i'm not so good at diagrams :p
[13:08:04] <Rab> That's OK. So all the other switches work, but X+ doesn't?
[13:08:12] <anarchos2> yea
[13:08:44] <Rab> Is it possible that NO is connected rather than NC on the switch?
[13:08:55] <anarchos2> first thing i checked
[13:10:09] <Rab> By X not working do you mean that there's a continuous fault, or that the switch doesn't cause a fault when tripped?
[13:11:34] <anarchos2> continuity fault, i believe. when i do a test between both com and nc to the rj45 pins, pins 2, 3, 4 have continuity when the switch is not pressed
[13:12:20] <anarchos2> nc with the switch pressed has continuity between 2, 3, 4 still
[13:12:20] <Rab> That sounds correct.
[13:12:34] <Rab> OK, that sounds like the switch is shorted or something.
[13:12:39] <anarchos2> and just double checking com
[13:12:57] <Rab> If you disconnect the switch entirely, is there still continuity?
[13:13:07] <anarchos2> same thing with com
[13:13:32] <CaptHindsight> ~4:00 https://www.youtube.com/watch?v=i3jA40arq9Y Magnetic Liquid in slow motion
[13:14:23] <anarchos2> Ok, so with the switch disconnected, it's the same, pins 2,3 4 from both the com and nc wires
[13:14:46] <anarchos2> now if i switch my x- for the x+, i should be able to see if it's the switch or the wiring
[13:17:43] <Rab> Sounds like there might be a short in your wiring, maybe across pins 2 and 3.
[13:18:56] <anarchos2> ok i'm confusing the crap out of myself
[13:19:15] <anarchos2> i tried swapping switches before, and the problem seemed in the wire
[13:19:26] <anarchos2> but now i tried again and it appears the problem follows the switch...
[13:19:39] <anarchos2> so i should be able to do a test across the switch itself and see...
[13:20:04] <anarchos2> maybe it's the not sleeping and i somehow put the same switch back on the same wire by accident :P
[13:29:33] <anarchos2> ok so it has to be the wiring
[13:31:34] <anarchos2> so if i'm not confused, pins 2, 3, 4 should be active, then when x+-x is pressed pin 4 should go dark, y+/y pin 3 goes dark and z+/- pin 2 goes dark
[13:38:13] <Rab> anarchos2, correct.
[13:40:22] <alexchally> I am trying to get my Y axis servo to reverse direction via a change to my ini file, but for some reason when I set OUTPUT_SCALE=-1 on axis 1, it also applies it to Axis 0. Any thoughts on how I stop that?
[13:42:27] <pcw_home> umm fix your hal file?
[13:45:36] <alexchally_cnc> pcw_home, my hal file seems to be pulling the correct values, [AXIS_0]OUTPUT_SCALE and [AXIS_1]OUTPUT_SCALE respectively
[13:46:19] <alexchally_cnc> but when I change OUTPUT_SCALE in either the ini or through the calibration menu, it flips both axis_0 and axis_1
[13:47:13] <alexchally_cnc> or did you mean something else that I am missing?
[13:57:59] <pcw_home> that indicates a ini or hal file error (probably a copy/paste error somewhere)
[13:59:44] <pcw_home> probably how the ini constant is applied
[14:06:39] <anarchos2> gah horrible luck today :(
[14:06:58] <anarchos2> limit switch wiring is fubar and the motor covers don't fit :(
[14:35:07] <Jymmm> How do you compensate for thermal expansion without changing dimensions? In the art I'm making I have 0.190" hole, but the part that goes in it has varied from lot to lot between 0.185" being snug to 0.190 being too small.
[14:35:13] <Jymmm> part*
[14:38:07] <Rab> Can you add some kind of gasket, like an o-ring?
[14:38:34] <Jymmm> No, user has to be able to slip-fit it on without tools or adhesives.
[14:40:50] <Loetmichel> i would make the hole 0.25" and paint it with rubber paint inside ;)
[14:41:23] <Jymmm> Loetmichel: LOL, go shield something will ya!
[14:41:27] <Jymmm> lol
[14:42:23] <Loetmichel> why?
[14:43:19] <Loetmichel> rubber not heat resistant enough? drill 0,3" and insert a folded square steel shim as a "spring fit"
[14:44:04] <Loetmichel> so that the 0.19" pin distorts the "square tube" and sits centered in int
[14:44:07] <Loetmichel> -n
[14:44:21] <Rab> Spring-loaded retaining feature, as in this pin? http://www.stu-offroad.com/misc/extmount/fireextmount-3.jpg
[14:44:48] <Loetmichel> Rab:would be a challenge in a 0.19" pin
[14:44:53] <Jymmm> Loetmichel: These are both plastics btw =)
[14:45:03] <Loetmichel> and if i understand him right the pins are not his job ;)
[14:45:19] <Loetmichel> oh, both plastics?
[14:45:29] <Jymmm> Nope, and they are varying from lot to lot is the problem.
[14:45:30] <jdh> .19" plastic isn't a pin, it is just jnk that hasn't broken yet.
[14:45:40] <Loetmichel> then just write in the manual "you might have to use some force"
[14:45:42] <Loetmichel> ;-)
[14:46:30] <Jymmm> Which might crack the hole
[14:46:35] <Loetmichel> jdh: oh, nearly 5mm, thats ok for a plastic pin
[14:46:40] <Jymmm> crack/deform
[14:46:48] <Loetmichel> Jymmm: right
[14:47:03] <Jymmm> snug is good, tight is iffy
[14:47:06] <Loetmichel> is the hole deep?
[14:47:24] <Loetmichel> ie, the plate you put it in is thicker than the pin?
[14:47:24] <Jymmm> 1/8 - 1/4"
[14:47:28] <Loetmichel> hmmm
[14:47:40] <Loetmichel> maybe do the "spings" in the hole?
[14:48:18] <Loetmichel> i.E.:mill something like a "thermal solder pad" puitside the hole?
[14:48:31] <Loetmichel> -pu+o
[14:48:59] <Loetmichel> thats how i would do it
[14:49:06] <Loetmichel> if it hast to be airtight
[14:49:10] <Jymmm> I'm thinking changing the shape of the hole; Maybe fluted or something
[14:49:32] <Loetmichel> like a rifle barrel?
[14:49:45] <Jymmm> riffled barrel, yeah, maybe.
[14:50:08] <Loetmichel> would help much with the dimesional errors
[14:50:35] <Loetmichel> i thought more like a (o) construction
[14:50:44] <Loetmichel> so that the hole can widen a bit
[14:50:45] <Jymmm> and maybe "flex" enough since now it has the added room/space to
[14:50:59] <Jymmm> .
[14:51:46] <Loetmichel> i.e left enad rivht of the hole in 1 or 2 mm distance two 160° circles
[14:51:52] <Jymmm> Maybe ( ) might work, but I don't think they'll be pleased with it esthetically. If I can conceal it a bit, they won't bitch .
[14:52:13] <Tom_shop> 'fluted' is what reprappers did when they printed their linear bearings
[14:52:26] <Tom_itx> damn netsplits
[14:52:47] <Jymmm> Tom_itx: to compensate you mean?
[14:53:46] <Loetmichel> they do it to reduce drag
[14:53:51] <Loetmichel> not compensate
[14:53:58] <Jymmm> ah
[14:55:39] <Jymmm> The really fucked up thing about all this... I bet you if I sit the parts out side in the sun for 20 minutes, everything will be loose.
[14:55:59] <Tom_itx> so put em in a freezer instead
[14:56:20] <Jymmm> Then they'll be brittle and crack =)
[14:56:33] <Tom_itx> what a waste of plastic: https://www.youtube.com/watch?v=YxOzXEJJUKE
[14:56:55] <Tom_itx> was trying to find their printed linear bearings
[14:57:06] <Jymmm> =)
[14:57:07] <Loetmichel> Tom_itx: "working" b earing
[14:57:40] <Tom_itx> yeah maybe pete could put those in his spindle motor
[14:58:47] <Tom_itx> Jymmm, the printed bearings are on the upper right corner: http://www.ebay.com/itm/Reprap-LM8UU-Prusa-Mendel-Printed-Parts-Kit-/150820586185
[14:59:35] <Jymmm> Tom_itx: ah
[15:00:02] <Jymmm> that's not grooves for balls to fit into?
[15:00:10] <Tom_itx> no
[15:00:14] <Tom_itx> they're linear bearings
[15:00:38] <Tom_itx> err supposed to be...
[15:01:05] <Jymmm> Tom_itx: Well, these linearbearings have balls https://www.damencnc.com/images/products/fullsize/lme20uu.jpg
[15:01:25] <Loetmichel> yeah, and the plstic parts are the direct replacement
[15:01:29] <Tom_itx> yeah
[15:01:38] <Loetmichel> to glide on the same rails and fit in the same mounts
[15:02:04] <Rab> ABS as a bearing surface?
[15:02:09] <Loetmichel> pla
[15:02:12] <Loetmichel> not abs
[15:02:24] <Loetmichel> and yes, thats why they are flutet
[15:02:29] <Loetmichel> fluted
[15:02:33] <Loetmichel> to reduce drag ;-)
[15:02:35] <Rab> Yeah, just read further.
[15:03:49] <Rab> Wonder if that performs better or worse than drilling a hole in a chunk of delrin.
[15:03:55] <ssi> this is clever
[15:03:55] <ssi> https://www.youtube.com/watch?v=arjRtCjI9AQ
[15:04:03] <Loetmichel> Rab: worse
[15:04:08] <MrHindsight> http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml might be handy to have as a link
[15:04:11] <Loetmichel> from, my experience
[15:04:59] <Tom_itx> MrHindsight, link it
[15:06:11] <MrHindsight> is there a section on the linuxcnc wiki with links to engineering calculators and articles about balls crew supports, bearings, practical machine design, etc etc?
[15:07:01] <Tom_itx> !wench learn torque_calc http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml
[15:07:02] <the_wench> I have learned torque_calc http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml is
[15:07:43] <MrHindsight> we have a bot?
[15:07:53] <Tom_itx> we have at least4 bots
[15:08:28] <Tom_itx> you can rename that to something more useful if you want
[15:08:35] <Jymmm> Tom_itx: WOW, that bearing / wasted plastic looks like shit for any tolerance at all!
[15:08:42] <MrHindsight> how does one access the wench? say you want to recall the link you just had it learn
[15:08:42] <Tom_itx> hahahaha
[15:08:53] <Tom_itx> i dunno
[15:09:02] <Tom_itx> wench torque_calc
[15:09:10] <MrHindsight> torque?
[15:09:15] <Tom_itx> !wench torque_calc
[15:09:20] <Tom_itx> stupid bot
[15:09:30] <Jymmm> !wrench
[15:09:43] <Jymmm> !left handed screwdriver
[15:09:43] <Loetmichel> !torque_calc
[15:09:45] <Tom_itx> !the_wench torque_calc
[15:09:53] <Tom_itx> the_wench
[15:10:00] <Tom_itx> the_wench torque_calc
[15:10:09] <Jymmm> !metric cresent wrench
[15:10:09] <kfoltman> we have the wenches here?
[15:10:09] <Loetmichel> hmmm
[15:10:14] <Tom_itx> i forgot how the bot works
[15:10:20] <MrHindsight> a bot to just post links to articles on lead vs ballscrews, microstepping, linear bearings, would be really handy
[15:10:25] <Jymmm> !help
[15:10:37] <Tom_itx> ask archivist, it's his bot
[15:10:43] <Loetmichel> hmmm
[15:10:52] <Loetmichel> i even have an eggdrop on my server
[15:11:17] <Tom_itx> !wench help
[15:11:18] <Loetmichel> but never activated it because i didt have the time to learn the script language /condiguration of it ;-)
[15:11:29] <Tom_itx> !the_wench help
[15:11:45] <Tom_itx> what is torque_calc
[15:11:52] <Tom_itx> i give up
[15:12:01] <MrHindsight> torque_calc?
[15:12:13] <Tom_itx> it's supposed to work like that yes
[15:12:16] <Tom_itx> torque_calc
[15:12:39] <Tom_itx> !wench forget torque_calc
[15:12:50] <Tom_itx> it's not responding
[15:13:23] <MrHindsight> hmm only to your request to store the link
[15:13:28] <Jymmm> !wench learn torque_calc http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml
[15:13:29] <the_wench> I have learned torque_calc http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml is
[15:13:50] <Jymmm> !wench learn torque_calc http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml tc
[15:13:50] <the_wench> I have learned torque_calc http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml tc is
[15:13:57] <Jymmm> !tc
[15:13:59] <Tom_itx> http://www.wench.archivist.info/index.php?chan=%23linuxcnc
[15:14:02] <Jymmm> !wrench tc
[15:14:05] <Tom_itx> not many there
[15:14:22] <Jymmm> ! get tc
[15:14:28] <Jymmm> !tc
[15:14:43] <Tom_itx> wait
[15:14:56] <Loetmichel> HAHA
[15:15:14] <Tom_itx> !wench torque_calc is http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml
[15:15:15] <Loetmichel> wench learn torque_calc is http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml
[15:15:24] <MrHindsight> calling archivist, calling archivist cqcqcq
[15:15:29] <Loetmichel> !wench learn torque_calc is http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml
[15:15:29] <the_wench> I have learned torque_calc is http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml
[15:15:36] <Tom_itx> torque_calc
[15:15:36] <the_wench> http://www.daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml
[15:15:37] <Tom_itx> there
[15:15:49] <Loetmichel> hihi, there we hat the same idea
[15:15:49] <Tom_itx> i forgot the 'is'
[15:16:09] <Loetmichel> [21:55] <Tom_itx> wait
[15:16:09] <Loetmichel> [21:56] <Loetmichel> HAHA
[15:16:14] <Loetmichel> ath the same time
[15:16:23] <Tom_itx> PetefromTn_, i'm checking local for your bearings
[15:16:25] <Tom_itx> bbl.
[15:16:41] <Tom_itx> they were calling NSK
[15:17:02] <PetefromTn_> hey thanks man..
[15:17:32] <Jymmm> !wrench cncporn is https://www.youtube.com/watch?v=A_qHR_H_2cg
[15:17:44] <MrHindsight> !wench ballscrew_fixity is http://machinedesign.com/linear-motion/importance-ballscrew-end-fixity
[15:17:45] <Jymmm> !wrench learn cncporn is https://www.youtube.com/watch?v=A_qHR_H_2cg
[15:18:25] <Jymmm> !wrench learn cncpron is https://www.youtube.com/watch?v=A_qHR_H_2cg
[15:18:29] <MrHindsight> !wench learn ballscrew_fixity is http://machinedesign.com/linear-motion/importance-ballscrew-end-fixity
[15:18:29] <the_wench> I have learned ballscrew_fixity is http://machinedesign.com/linear-motion/importance-ballscrew-end-fixity
[15:19:20] <Jymmm> !wrench cncpron is https://www.youtube.com/watch?v=A_qHR_H_2cg
[15:19:58] <andypugh> Woohoo! http://youtu.be/mpHFVzwwZWs
[15:21:34] <Jymmm> andypugh: new toy?
[15:21:58] <Jymmm> needs air in back tire too =)
[15:22:07] <andypugh> Not that new. It looked like this in April… http://bodgesoc.blogspot.co.uk/2014/04/1921-ner-car.html
[15:22:37] <Jymmm> andypugh: ah, very cool =)
[15:22:50] <MrHindsight> How I Spent my Summer Vacation
[15:23:04] <Jymmm> andypugh: FUCK! Lots of rust damage
[15:23:18] <andypugh> How I spent every free hour when I wasn’t at work or asleep, it seems like.
[15:23:32] <MrHindsight> andypugh, what year is that one? ~1920
[15:23:33] <andypugh> It’s been quite a project.
[15:23:37] <andypugh> 1921
[15:24:26] <Jymmm> andypugh: WTF man, the front fender doesn't turn with the wheel... you get splashed in the face on turns! lol
[15:24:31] <Jymmm> =)
[15:24:46] <Jymmm> andypugh: very cool btw =)
[15:25:54] <Jymmm> andypugh: Damn dude... how did you make the new one? http://4.bp.blogspot.com/-TECnse3u9Uk/U0nXlWrl3KI/AAAAAAAADQ4/pWmydwntwRc/s1600/IMG_1109.jpg
[15:26:00] <MrHindsight> ballscrew_fixity
[15:26:00] <the_wench> http://machinedesign.com/linear-motion/importance-ballscrew-end-fixity
[15:26:14] <Jymmm> cncporn
[15:26:17] <Jymmm> bah
[15:26:26] * Jymmm chuckles
[15:26:26] <MrHindsight> cncpron
[15:26:54] <andypugh> Jymmm: Snips and a hammer. I am quite good with metal.
[15:27:04] <Jymmm> andypugh: ah
[15:27:57] <Jymmm> !wrench learn linuxcnc is http://linuxcnc.org/
[15:28:03] <MrHindsight> so it looks like the syntax is !wench learn (something) is (hyperlink)
[15:28:28] <Jymmm> MrHindsight: try what I just did
[15:29:06] <MrHindsight> !wrench learn linuxcnc is http://linuxcnc.org
[15:29:27] <MrHindsight> !wrench learn linux_cnc is http://linuxcnc.org
[15:29:46] <Jymmm> linuxcnc
[15:29:53] <Jymmm> *shrug*
[15:30:05] <Jymmm> ballscrew_fixity
[15:30:06] <the_wench> http://machinedesign.com/linear-motion/importance-ballscrew-end-fixity
[15:30:46] <Jymmm> !wrench learn ballscrew_test is http://machinedesign.com/linear-motion/importance-ballscrew-end-fixity
[15:30:58] <Jymmm> I give up
[15:31:34] <MrHindsight> !wrench learn ballscrew_test is http://machinedesign.com/linear-motion
[15:31:44] <MrHindsight> odd
[15:33:28] <MrHindsight> !wench learn ballscrew_leadscrew is http://machinedesign.com/archive/ballscrews-vs-lead-screws
[15:33:29] <the_wench> I have learned ballscrew_leadscrew is http://machinedesign.com/archive/ballscrews-vs-lead-screws
[15:34:40] <skunkworks_> andypugh, you are one imrpessive guy - love the smile at the end.. :)
[15:35:59] <MrHindsight> !wench learn mechanical_systems is http://machinedesign.com/essentials-mechanical-systems
[15:36:00] <the_wench> I have learned mechanical_systems is http://machinedesign.com/essentials-mechanical-systems
[15:36:56] <SpeedEvil> http://www.ebuyer.com/630828-gigabyte-ga-j1900n-d3v-intel-celeron-j1900-2ghz-vga-dvi-hd-audio-mini-itx-ga-j1900n-d3v - hmm
[15:37:03] <SpeedEvil> even with parallel port onboard
[15:37:58] <andypugh> SpeedEvil: And 12V input too?
[15:38:13] <MrHindsight> !wench learn microstepping is http://www.micromo.com/microstepping-myths-and-realities
[15:38:14] <the_wench> I have learned microstepping is http://www.micromo.com/microstepping-myths-and-realities
[15:40:29] <andypugh> SpeedEvil: Ah, no. I didn’t spot the stealth ATX power connector.
[15:41:15] <SpeedEvil> Power rails it atually requires wouldbe interesting
[15:44:21] <PetefromTn_> https://www.youtube.com/watch?v=7KtAgAMzaeg Reminds me of this place SOMETIMES LOL
[15:44:33] <Tom_itx> somebody's having too much fun with the bot now
[15:45:00] <Tom_itx> hey i recognize the dude in that video
[15:45:59] <MrHindsight> Tom_itx, just for the top few questions in here
[15:46:01] <PetefromTn_> Which guy?
[15:46:13] <Tom_itx> andypugh i see you got it done finally !
[15:46:41] <Tom_itx> MrHindsight the problem with the bot is remembering what you saved it as
[15:47:30] <andypugh> Tom_itx: Still jobs to do, but it’s now a working motorcycle and I am celebrating with a an evening of not working on it. It’s been a bit all-absorbing.
[15:47:43] <MrHindsight> Tom_itx, it seems to filter out using the same link for different terms
[15:48:02] <Tom_itx> you _can_ have multiple links to one though
[15:49:51] <MrHindsight> SpeedEvil, we have the new AMD APU's working well now, some mini-itx boards have LPT ports as well
[15:50:29] <MrHindsight> 3.14 RTAI is also working well
[15:54:50] <openyk> can someone tell me what language LinuxCNC is written in?
[15:55:45] <andypugh> It is written in many languages.
[15:56:22] <andypugh> The realtime code is all in C. The inteface layers in C++. Then the GUIs and other stuff are generally in Python or Tcl
[15:57:18] <openyk> Ah thanks! Exactly the overview I needed.
[15:57:27] <andypugh> There are also some bash scripts and a rather complex set of makefiles.
[16:00:07] <openyk> What does it take to join the developer list?
[16:03:29] <andypugh> Anyone can join the developer list
[16:03:46] <andypugh> This looks like something of a bargain: http://www.ebay.co.uk/itm//380965943619
[16:03:56] <andypugh> I may even buy one just to have it on hand.
[16:05:10] <andypugh> openyk: Developers mailing list is here https://lists.sourceforge.net/lists/listinfo/emc-developers and the developers IRC channel is #linuxcnc-devel
[16:07:25] <PCW> wonder what kind of encoder that has (and at least it has the motor/encoder connector ends)
[16:07:29] <openyk> Thanks. Subscribed.
[16:09:09] <andypugh> PCW: Ah, yes, it might be something odd, other than something simple like a Resolver or incremental, especially as it is likely to be from a Robot.
[16:10:21] <DaViruz> Loetmichel: any suggestinos for an online marketplace where one could find an electric scooter in germany?
[16:10:31] <DaViruz> preferably an e-max 90S or 110S
[16:11:02] <PCW> if its older it might be a resolver, newer may be serial absolute of some kind, or maybe incremental with Halls
[16:11:16] <Loetmichel> DaViruz: no idea
[16:30:37] <Deejay> gn8
[16:35:31] <onyedikilo> hi
[16:35:56] <MrHindsight> welcome
[16:38:39] <onyedikilo> i was reading the driver manual for the stepper drivers and it says i need to put 240 ohm resistors to the pul+ and dir+ wires coming from the breakout board to driver. I havent done it yet and i am loosing steps, could it be related? What are the resistors for?
[16:39:17] <MrHindsight> they limit current through the LED's in the optoisolators
[16:39:25] <MattyMatt> probably current limiting for the optos
[16:40:07] <MrHindsight> onyedikilo, what breakout board are you using, the docs are often confusing
[16:41:05] <onyedikilo> i have pmdx-126, but the instructions with the resistor is from the stepper driver (leadshine dm870)
[16:41:10] <MrHindsight> onyedikilo: also which stepper drivers?
[16:43:14] <MrHindsight> the dm870 has internal 270 ohm series resistors on the opto inputs
[16:43:42] <MrHindsight> I have to see what the pmdx-126 has for outputs
[16:44:47] <MrHindsight> onyedikilo: do you know what the output voltage is you are using on the pmdx-126?
[16:44:57] <onyedikilo> should be 5v
[16:45:22] <MattyMatt> I saw a neat mosfet driver made with 2 optos and 2 red led in a chain across 5V, with a logic input in the middle, so one or the other opto+led could forward conduct, with a little dead time on switching
[16:45:52] <MrHindsight> according to the dm870 manual for 5V the internal resistors are all you need
[16:46:26] <MrHindsight> if you add series resistance the current might be to low to drive the optos reliably
[16:46:36] <MrHindsight> so you might have missing steps
[16:47:31] <MrHindsight> onyedikilo: http://www.pmdx.com/pmdx-126 is this the breakout board?
[16:48:07] <MrHindsight> if so what rev do you have?
[16:48:29] <onyedikilo> MrHindsight can you have a look at http://www.americanmotiontech.com/Upload/Manuals/DM870m.pdf ? The section that reads 4. Control Signal Connector (P1) Interface shows 270 ohm resistors connected to the wires.
[16:48:47] <onyedikilo> yes i have rev C
[16:49:51] <MrHindsight> page #5
[16:50:22] <onyedikilo> yes the diagram shows the 270ohm resistors
[16:50:28] <onyedikilo> on page 5
[16:50:49] <MrHindsight> yes, those are internal in the DM870
[16:51:00] <onyedikilo> oh ok
[16:51:06] <MrHindsight> all you need for 5V signals
[16:51:33] <onyedikilo> so there goes my lost step theory
[16:51:48] <MrHindsight> the other external series resistors are required when you have higher input voltages such as 12V or 24V
[16:52:10] <onyedikilo> i am pulling my hairs out, could not find a solution yet for the lost steps
[16:52:43] <SpeedEvil> have you looked under the sofa?
[16:52:44] <onyedikilo> for short runs , no lost steps that i can measure
[16:52:51] <MrHindsight> let me check the pmdx-126 manual
[16:53:31] <onyedikilo> for long runs like 1 hour or more , there dial indicator shows 0,2 - 0,3 mm off
[16:53:49] <PCW> step polarity?
[16:54:15] <onyedikilo> if i run the g-code in say 20.000 lines at a time no lost steps
[16:54:20] <MrHindsight> or possibly pulse width and hold times
[16:54:52] <onyedikilo> i am using 5us pulses, tried changing to 10us
[16:55:06] <MrHindsight> onyedikilo: under what conditions do you lose steps?
[16:55:19] <onyedikilo> long runs
[16:55:45] <onyedikilo> not more than 0.3 mm
[16:55:56] <onyedikilo> sometimes as little as 0.025mm
[16:56:05] <onyedikilo> different results everytime
[16:56:28] <onyedikilo> tried with acceleration and velocity with crawl speeds
[16:56:32] <MrHindsight> are you saying that you lose 0.3mm - 0.25mm on long travels?
[16:56:39] <onyedikilo> yes
[16:56:45] <onyedikilo> sometimes less
[16:57:20] <openyk> your machine is more precise than 0.3mm? what real-time kernel are you using?
[16:57:21] <onyedikilo> but i ran a 10.000 line linear motion gcode and no lost steps recently
[16:57:42] <onyedikilo> 0.3mm is precise ?
[16:58:07] <openyk> 0.3mm is quite precise, at least in the hobbyist world
[16:58:14] <onyedikilo> 10.000 lines of code and no drifts and dial indicator is spot on
[16:58:23] <MattyMatt> close enough for woodwork
[16:58:57] <openyk> what's the machine?
[16:59:16] <onyedikilo> i built it, diy
[16:59:34] <onyedikilo> aluminum extrusions mostly
[16:59:34] <MattyMatt> what microsteps?
[16:59:39] <onyedikilo> 8x microsteps
[16:59:41] <openyk> do you have an oscilloscope
[16:59:52] <onyedikilo> because of the low speed vibrations
[17:00:05] <onyedikilo> i dont have an ossiloscope but i have a friend who does
[17:00:34] <onyedikilo> can you tell me what to look for with an oscilloscope ?
[17:00:46] <openyk> it might be worth using an oscope with the long-record feature to check whether the issue is from the controller or from the driver
[17:01:00] <MattyMatt> try the same run on 1/2 microsteps, if you still lose then it probably isn't a pc/linuxcnc issue
[17:01:29] <openyk> yeah try matty's method
[17:01:46] <openyk> simple check to isolate the problem
[17:01:46] <onyedikilo> ok i will give it a shot
[17:02:11] <onyedikilo> it just takes 1:30h to check any changes i make
[17:02:17] <openyk> let us know if the error persists, increases, decreases, etc.
[17:02:35] <MattyMatt> also try turning off the GL preview. it makes jogging way smoother for a start on mine
[17:02:52] <onyedikilo> ok
[17:03:11] <onyedikilo> will do so and let you know tomorrow
[17:03:16] <onyedikilo> thank you all
[17:03:24] <openyk> oh
[17:03:30] <openyk> what linear guides are you using
[17:03:30] <MrHindsight> onyedikilo: does speed have any effect on lost steps?
[17:03:48] <onyedikilo> hiwin linear guides
[17:03:48] <openyk> and are the leadscrews thrust-tensioned
[17:04:11] <onyedikilo> i am not sure about the leadscrew tensioning
[17:04:16] <openyk> because your stepper shafts+leadscrews will move axially if not tensioned out
[17:04:36] <openyk> I assume your long tests involve back and worth movements
[17:04:52] <openyk> so that's a potential cause I suspect
[17:05:11] <onyedikilo> yes it is a 3d path
[17:05:29] <openyk> I assume you've just connected your leadscrew directly to the coupling then to stepper
[17:05:31] <MrHindsight> yeah, lash, binding etc
[17:05:39] <onyedikilo> yes direct coupling
[17:05:50] <MrHindsight> what type of coupling?
[17:05:54] <openyk> yeah there's backlash, leadscrew axial tension, and leadscrew/motor shaft axial play
[17:06:04] <onyedikilo> i removed the end bearing block for the z axis
[17:06:31] <onyedikilo> there is some binding and it felt good after removing the block
[17:07:03] <MrHindsight> well there's one problem
[17:07:48] <openyk> without leadscrew bearing blocks with thrust bearings you will get motor shaft axial play
[17:07:52] <onyedikilo> whatever i did could not get rid of the binding, but the binding is apperent only on low velocities
[17:08:22] <openyk> what kind of binding? I'd imagine the bearings would handle properly
[17:09:06] <onyedikilo> openyk, i really don't know it seems to me that the linear rails are not perfectly parallel
[17:09:29] <onyedikilo> because the growling begins when i get closer to one direction
[17:09:36] <onyedikilo> z+ that is
[17:09:56] <MrHindsight> you need to sort out all the mechanical issues first
[17:10:51] <openyk> so 2 linear rails on z axis, lack of parallel would indeed cause that growling with the tension-friction on the linear guides
[17:11:36] <openyk> common way to correct that is to use setscrews to calibrate the angle
[17:12:11] <MattyMatt> they should put load cells in the blocks, with an output for you, and a chip for their warranty voiding dept.
[17:12:18] <openyk> and having mounting holes/slots precisely enough made
[17:12:58] <openyk> without and end bearing block 0.3mm is to be expected from the axial play
[17:13:23] <onyedikilo> so i better put that back on
[17:13:47] <openyk> yeah, and past that the root issue seems to be the parallelity
[17:13:53] <openyk> parallelism*
[17:14:18] <openyk> and it's not necessarily the linear guides
[17:14:29] <MattyMatt> the rails need to screwed to a flat base
[17:14:50] <njh> Hello
[17:14:58] <MrHindsight> ballscrew_fixity
[17:14:58] <the_wench> http://machinedesign.com/linear-motion/importance-ballscrew-end-fixity
[17:15:01] <onyedikilo> yes they are mounted on a block of aluminum
[17:15:13] <MrHindsight> it applies to leadscrews as well
[17:15:18] <njh> What is the difference between the ESTOP OUT and Amplifier Enable in Step Conf?
[17:16:26] <MattyMatt> Amplifier Enable should be one per axis
[17:16:34] <MattyMatt> although they are often commoned
[17:16:47] <MrHindsight> njh: E-STOP should halt the whole system, the amp enable is just for that one axis and drive
[17:17:04] <njh> Hm
[17:18:09] <njh> I have E-STOP on Pin 1, which seems to be normal? And on my breakout board, that goes to the amp enable on each axis
[17:18:10] <onyedikilo> openyk, my leadscrew is fixed-supported i removed the support, will put it back on
[17:19:37] <openyk> cool. I expect that will solve the axial play issue. for the parallelism i'd loosen certain mounting screws and jog a full ridethen retighten
[17:20:03] <njh> don't think I am going to get it sorted out tonight
[17:20:03] <onyedikilo> is there a foolproof way to test one axis for lost steps to see if it is a binding issue ?
[17:20:05] * njh goes to bed
[17:20:12] <openyk> unless you have calibration screws, in which case i'd use those to fix up the angles)
[17:20:31] <onyedikilo> i dont have calibration screws
[17:20:43] <openyk> if you have an oscope
[17:21:02] <MrHindsight> it's funny how those parts just aren't there for show :)
[17:21:17] <onyedikilo> :)
[17:21:19] <MrHindsight> onyedikilo: do you have any pics of your machine?
[17:21:34] <openyk> with an oscope with a trigger count feature, you can record a long run with a predefined number of steps, then count those against the oscope record
[17:21:45] <openyk> that will tell you whether steps are lost at least from the pc/linuxcnc side
[17:21:49] <onyedikilo> MrHindsight, i can get one if you like
[17:22:18] <onyedikilo> openyk, yes i understand now, i will also give it a shot
[17:22:19] <MrHindsight> of the leadscrew and linear bearings would be nice
[17:22:25] <MattyMatt> you could do something cleverclever with a camera and a dial on the motor shaft. a lost step on a 200spr motor will be obvious
[17:22:33] <MrHindsight> that might also tell us something
[17:22:44] <openyk> alternatively, a simpler solution is to get an encoder on the motor output whther that be crude circle paper or a real encoder
[17:22:46] <MattyMatt> or a xenon strobe and your eyes
[17:23:08] <openyk> and do a lot of complete revolutions :)
[17:23:12] <onyedikilo> let me get the picture brb
[17:24:16] <MrHindsight> people have used flexible couplings and flimsy sheet metal and then wondered why their machine doesn't work right
[17:24:53] <openyk> some people don't know the difference between iron and steel... even reputable metal shops
[17:24:55] <MrHindsight> not saying you've done that, but sometime a picture helps to understand the overall build quality
[17:25:01] <MrHindsight> and machine design
[17:25:29] <MattyMatt> some people don't know the difference between pvc and rubber hose...as a coupler :)
[17:25:35] <openyk> received a bunch of steel for a metal saw machine build and it vibrated like hell
[17:26:14] <MattyMatt> if it's tube, fill it with granite epoxy
[17:26:18] <onyedikilo> well i am not a mechanical engineer, i just did it for fun. Learned a lot during the process, still lots to learn
[17:27:50] <openyk> yep and I think that can be said for a lot of things :)
[17:28:18] <onyedikilo> http://tinypic.com/r/mjaliv/8
[17:28:48] <onyedikilo> http://tinypic.com/r/sg3mac/8
[17:29:26] <onyedikilo> http://tinypic.com/r/14jopbq/8
[17:30:17] <MrHindsight> you've got flexible couplings
[17:30:41] <openyk> flexible spider couplings indeed
[17:31:18] <onyedikilo> yes someone said they act like springs
[17:31:37] <MrHindsight> they sure do
[17:32:02] <MrHindsight> the one link i don't add to the bot
[17:32:04] <openyk> commonly used for their great shaft offset tolerance
[17:32:05] <andypugh> _everything_ acts like a spring.
[17:32:44] <MrHindsight> if there's heat there's vibration :)
[17:33:22] <onyedikilo> so wrong couplings for the job?
[17:33:34] <openyk> the couplings are fine
[17:34:37] <Roguish> a better coupling is a bellows style. very stiff torsionally, soft in translation.
[17:34:59] <openyk> solid couplings require a heck of precision process or calibration, and helical/bellows couplings have less offset tolerance but more rigidity
[17:35:21] <MrHindsight> http://machinedesign.com/archive/prevent-coupling-failure-good-design-installation-and-maintenance might be of interest
[17:36:14] <MrHindsight> http://machinedesign.com/mechanical-drives/how-coupling-types-affect-bearing-forces
[17:37:23] <MrHindsight> onyedikilo: your profile bearings shouldn't be binding
[17:37:43] <MrHindsight> onyedikilo: are new or used?
[17:37:50] <onyedikilo> new
[17:38:04] <onyedikilo> every component is new
[17:38:59] <MrHindsight> if the ballscrews are loose, do the bearings slide smoothly?
[17:39:10] <Roguish> parallel linear bearing need to be installed correctly. tighten one rail, the float the other side in while moving the carriage. only way to get parallel.
[17:39:21] <onyedikilo> yes slides very nice
[17:39:34] <openyk> ^roguish process is the way to go
[17:39:36] <onyedikilo> roguish, thats the way i did
[17:40:00] <openyk> but sometimes the clamped rail is offset
[17:40:00] <MrHindsight> if that is the case then your ballscrew might not be parallel to the bearings
[17:40:17] <Roguish> that is the recommended method by all manufacturers. used to work for one.
[17:40:22] <openyk> if your leadscrew is fixed-supported floating both rails might be worth a shot
[17:40:53] <MrHindsight> is you turn the screw by hand without the motor attached does it get easier or harder to turn as you move to one end?
[17:41:08] <MrHindsight> is/if
[17:41:09] <Roguish> ah, same with the screw. align after the rails, use similar method.
[17:41:38] <onyedikilo> MrHindsight, it goes smooth when turned with hand
[17:41:59] <MrHindsight> onyedikilo: through the entire range of travel?
[17:42:04] <onyedikilo> yes
[17:42:34] <onyedikilo> i did not check the x axis, it is dual drive
[17:42:47] <onyedikilo> but the z goes nice
[17:43:02] <MrHindsight> do you lose steps on just one axis or more than one?
[17:45:13] <onyedikilo> MrHindsight, i believe only in Z, in certain times
[17:45:48] <onyedikilo> could not check the other ones extensively
[17:46:05] <MrHindsight> onyedikilo: what size stepper on Z? what torque?
[17:46:09] <onyedikilo> but from the parts i machined, i can say the x and y are ok
[17:46:28] <onyedikilo> i have a nema 34, 8.5nm stepper
[17:46:34] <openyk> my bet's still on the lack of end bearing block.
[17:46:44] <Roguish> Z axes (in the vertical direction) can have issues if you don't remember that gravity works. you always have the greatest load in an upward acceleration.
[17:47:22] <MrHindsight> onyedikilo: did you lose steps before you took off the bearing?
[17:48:49] <onyedikilo> MrHindsight, yes i had a real bad binding issue, remachined the motor connections and also the aluminum block for the carriages. The z was going down before the remachining, now it goes up.
[17:49:09] <onyedikilo> i mean it used to plunge
[17:49:20] <onyedikilo> now it just gains height
[17:49:32] <onyedikilo> no more going down
[17:49:54] <onyedikilo> and also, before the adjustments the plunges were catastrophic
[17:50:14] <onyedikilo> i lost around 6 bits and many wood columns
[17:50:26] <MrHindsight> ouch
[17:53:27] <onyedikilo> i will reinstall the bearing block, do some tests, if they turn out bad, i will try half stepping
[17:54:00] <onyedikilo> if still bad, i will buy an easy servo and install it on z
[17:54:17] <onyedikilo> i am out of ideas
[17:54:37] <MrHindsight> microstepping
[17:54:37] <the_wench> http://www.micromo.com/microstepping-myths-and-realities
[17:54:41] <onyedikilo> i even rewired the entire control box
[17:54:58] <Roguish> check if your motor has enough power: http://www.orientalmotor.com/support/motor-sizing.html
[17:55:24] <MrHindsight> 8.5nm
[17:55:36] <MrHindsight> whats the weight of the spindle?
[17:55:55] <onyedikilo> let me check, probably around 6kg
[17:56:19] <Roguish> not just to hold or cruise, but to accelerate up or decallerate while going down. don't forget GRAVITY.
[17:56:37] <Roguish> is there a gearbox?
[17:56:43] <onyedikilo> no gearbox
[17:56:45] <MrHindsight> i closed up the pic, what's the screw pitch and size?
[17:56:48] <onyedikilo> direct coupling
[17:56:55] <onyedikilo> 10mm pitch
[17:57:05] <Roguish> you could also have an inertia mismatch.
[17:57:32] <onyedikilo> diameter is i think 16mm
[17:58:29] <MrHindsight> 8.5nm at 8 microsteps is 1.7nm
[17:59:36] <MrHindsight> let us know how it goes
[17:59:57] <onyedikilo> ok thanks a lot
[18:00:20] <onyedikilo> you guyz are always helpful
[18:00:54] <onyedikilo> l8r
[18:01:25] <Roguish> here is another one: http://www.ni.com/white-paper/11741/en/
[20:18:22] * likevinyl is away: Beware! The hippies will drink your beer!
[21:37:43] <PetefromTn_andro> Evening folks
[21:38:20] <XXCoder> hey
[21:38:32] <PetefromTn_andro> Whatzgoinon?
[21:38:39] <XXCoder> bored lol
[21:39:10] <PetefromTn_andro> I hear ya
[21:40:14] <zeeshan> you guys need to garden
[21:40:22] <zeeshan> i harvested tomatoes, chilis, okra today
[21:40:24] <zeeshan> =D
[21:40:32] <XXCoder> nice but I have black thumb
[21:40:34] <PetefromTn_andro> Well I think Imay have found A reasonable source for my spindle motor bearings.
[21:41:05] <PetefromTn_andro> And a big no to the gardening thing
[21:42:40] <PetefromTn_andro> Besides my next door neighbor had a massive garden and they are always giving us vegetables for free because we are nice neighbors LOL
[21:44:19] <skunkworks_> we have problems gardening... Our tomatoes where a bust again... we did get quite a few heads of broccoli, a few peppers.. we might have some squash..
[21:44:37] <PetefromTn_andro> Listening to the Blade Runner Soundtrack on my headphones. Love this stuff.
[21:44:38] <skunkworks_> walnut trees play havoc to gardening
[21:44:52] <XXCoder> talking about walnuts
[21:45:02] <zeeshan> skunkworks_: why
[21:45:10] <XXCoder> people managed to find american walnut trees that surivied fungus that killed most of em
[21:45:21] <XXCoder> its location is top secret as they try to grow em elsewhere
[21:45:34] <XXCoder> walnuts from american trees is MUCH bigger
[21:46:04] <PetefromTn_andro> I just Don't like orking outside in the dirt in the sun. Seems too much like manual labor hehe
[21:46:33] <PetefromTn_andro> Working
[21:49:43] <zeeshan> http://i.imgur.com/iUbhYqh.jpg
[21:49:44] <zeeshan> wow..
[21:49:44] <PetefromTn_andro> While I have my spindle motor Pa
[21:50:10] <PetefromTn_andro> Apart I M
[21:50:35] <PetefromTn_andro> Am gonna get the encoder shaft setup for it
[21:50:49] <zeeshan> http://www.cnn.com/2014/08/27/showbiz/cops-crew-member-shot-killed/index.html?hpt=hp_t2
[21:50:53] <zeeshan> i meant to post that
[21:53:06] <XXCoder> cops :(
[21:53:19] <XXCoder> they're murder happy lately
[21:53:39] <XXCoder> scary to me because I'm deaf. they may end up calling me from behind and I get shot
[21:53:50] <XXCoder> deaf and now deaf in other way
[21:57:16] <ChuangTzu> deaf = dead
[21:57:16] <PetefromTn_andro> I cannot imagine why anyone would want to become a police officer. Thankless freaking job with crazy high danger levels
[21:57:33] <ChuangTzu> because they like getting away with kicking random people's asses
[21:57:35] <XXCoder> pete but STILL NO EXCUSE
[21:58:13] <PetefromTn_andro> No excuse for what
[21:58:20] <XXCoder> murders
[21:58:43] <PetefromTn_andro> That's not murder my friend
[21:59:02] <XXCoder> fine. "sucided with gun when back handcuffed in back of car"
[22:00:56] <PetefromTn_andro> It said he shot at them with a pellet pistol..not too freaking smart unless you want to meet your maker
[22:01:17] <XXCoder> shot pellet gun while handcuffed hands in back and in police car?
[22:01:23] <XXCoder> how?
[22:01:28] <XXCoder> using JFK magic bullet?
[22:02:19] <XXCoder> theres other case where person was hit with taser 32 times
[22:02:31] <XXCoder> torture to murder
[22:02:48] <PetefromTn_andro> Dion and a cameraman were traveling with police officers who responded to a robbery inside a Wendy's restaurant on Tuesday night. Schmaderer said the suspect, Washington, fired two shots at the responding officers, who responded with a barrage of gunfire.
[22:04:24] <XXCoder> not talking about that one
[22:04:35] <PetefromTn_andro> Unless you were there you will never know really. People do crazy shit and many don't care if you are a cop or not
[22:05:16] <PetefromTn_andro> Like I said I wouldn't ever want to be a cop
[22:05:43] <XXCoder> I wouldnt want to be one either. I'm telling you evenually people will rise against cops
[22:06:05] <PetefromTn_andro> Good luck with that.
[22:06:23] <XXCoder> not saying I support either side
[22:06:34] <XXCoder> just saying it will happen if cops keeps doing that.
[22:07:51] <PetefromTn_andro> It happens anyway and they usually wind up dead.
[22:07:54] <XXCoder> een worse group of cops let their dog pee on memorial then used car to drive all over it
[22:08:04] <XXCoder> that shows high level of spite
[22:09:05] <Tom_itx> social media blows facts all to hell
[22:09:17] <PetefromTn_andro> Well I better get to bed. Cya guys later.
[22:09:30] <Tom_itx> no word on the bearings
[22:09:35] <Tom_itx> expect them to call tomorrow
[22:09:38] <PetefromTn_andro> Huh?
[22:10:25] <PetefromTn_andro> Oh okay thanks. I did get an email from an eBay seller who has the right ones for a good price after I asked them a question
[22:10:29] <Tom_itx> i was just checkng on them for you
[22:10:55] <Tom_itx> they were on the phone with NSK when i was talking to them
[22:11:00] <Tom_itx> said they'd get back to me
[22:11:04] <XXCoder> wow. http://www.fromquarkstoquasars.com/you-can-fit-all-of-the-planets-between-earth-and-the-moon/
[22:11:06] <PetefromTn_andro> Waiting to hear back from them tomorrow and will probably order them.
[22:11:12] <XXCoder> space is big.
[22:11:31] <Tom_itx> i was just curious how hard they were to find
[22:11:43] <Tom_itx> my bud had to replace a ballscrew end bearing on a mill
[22:11:49] <Tom_itx> $1400
[22:11:56] <Tom_itx> he found one for $700
[22:12:11] <PetefromTn_andro> Thanks Tom it is appreciated. Let me know what you find I can probably hold off ordering them until I hear from you.
[22:12:11] <Tom_itx> double race bearing
[22:12:33] <Tom_itx> anything precision isn't gonna be cheap
[22:12:48] <Tom_itx> the nxp ones are probably crap
[22:12:51] <PetefromTn_andro> If it is a matched pair yeah they can be quite expensive
[22:13:16] <PetefromTn_andro> The ones I am looking at are fafnir
[22:13:26] <Tom_itx> decent brand
[22:13:34] <PetefromTn_andro> USA made
[22:14:05] <PetefromTn_andro> They are rated at 17k with grease
[22:14:23] <PetefromTn_andro> Should be fine for my application
[22:15:04] <PetefromTn_andro> But like I said let me know what you find out.
[22:15:09] <Tom_itx> these will likely be more than your ebay contact i'm sure
[22:15:23] <PetefromTn_andro> Ya never know...
[22:15:41] <Tom_itx> i'm out.
[22:15:53] <PetefromTn_andro> Well gn8 folks
[22:16:28] <XXCoder> I'm just glad I live at washington state
[22:29:41] <tjtr33> hey, goodbye IchGucklive! I was out on the road for a week & he went into hermitage. Have fun Ich!
[22:33:14] <XXCoder> he left for good or what?
[22:52:57] <tjtr33> i hear he's hes gone off to the woods and will be offline for some years. he was very helpful, made many good videos. he was hard to understand sometimes, but hey he was a real character. good to have known him.
[22:53:08] <XXCoder> yeah
[23:28:27] <CaptHindsight> Ich said he is going to be the equivalent of a National Park Ranger in a deep valley with no internet or phone service
[23:30:37] <CaptHindsight> 120m deep valley with nearest neighbor ~6 miles away
[23:42:54] <tjtr33> weird robot flips itself to 'walk' http://www.idsc.ethz.ch/Research_DAndrea/Cubli
[23:43:32] <tjtr33> use 'reaction motors' like a flywheel/servo
[23:44:58] <XXCoder> CaptHindsight: interesting