#linuxcnc | Logs for 2013-12-24

[02:13:15] <Deejay> moin
[05:26:43] <Jymmm> Well, if you are ever in need for a 1.25" hole punch die for $13, Try Ikea... http://www.ikea.com/us/en/catalog/products/28512100/
[10:34:35] <CaptHindsight> toasty -6 F (-21C) today
[10:37:59] <CaptHindsight> is everyone busy machining their last minute gifts?
[10:38:20] <archivist> doing bugger all
[10:39:18] <archivist> gift free zone as home alone
[10:40:17] <CaptHindsight> out the door here before the metal supplier closes
[11:27:53] <IchGuckLive> hi all and merry Xmas all over the world
[13:26:36] <IchGuckLive> end of EVA#2 in space im off to the santa presents delivery
[13:27:09] <IchGuckLive> http://www.noradsanta.org/ santa is nearing at 1024km/h
[13:27:26] <IchGuckLive> BYE
[13:28:20] <sirdancealo2> 1 mm/h?
[14:04:34] <Tom_itx> pcw_home do you use standard leds on the 7i71 outputs?
[14:05:38] <Tom_itx> this board has one out, i was gonna swap out
[14:08:07] <pcw_home> Any should do
[14:11:07] <pcw_home> (I did say they were blems, they may in fact be hand soldered protos)
[14:11:45] <Tom_itx> doesn't look hand soldered but who knows
[14:11:47] <Tom_itx> they did replace an led with a blue one
[14:15:49] <Deejay> re
[15:13:37] <jdh> http://raleigh.craigslist.org/tls/4253253203.html
[15:54:52] <eric_unterhausen> if it weren't for ping timeouts, there would be no activity at all
[15:55:18] <eric_unterhausen> nothing wrong with that
[15:57:12] <eric_unterhausen> anyone ever seen a bridgeport right angle milling attachment for nmtb 30?
[15:59:23] <toastyde1th> nope
[16:03:25] <eric_unterhausen> I thought the r8 milling attachments were expensive
[16:03:39] <eric_unterhausen> the ones for cat 40/50 are 10k
[16:14:13] <JT-Shop> I wonder if there is any drawbacks using a 0.05% solution of sodium nitrite to soak the inside of my tractor gas tank to remove the rust?
[16:17:37] <CaptHindsight> JT-Shop: it absorbs water
[16:17:48] <JT-Shop> it?
[16:17:59] <CaptHindsight> or highly soluble based on how you look at it
[16:18:17] <CaptHindsight> Sodium nitrite
[16:18:57] <JT-Shop> I just noticed how it keeps my plasma water table rust free and even removed some rust when I built the tank
[16:19:27] <NickParker|2> Hi folks. I'm on winter break and college apps are done - it's finally time to get back to milling.
[16:19:57] <NickParker> Current status is that I can upload firmware to my 6i25 without bricking it, but i seem to only be able to set dmesg to pure GPIO
[16:20:28] <JT-Shop> I guess I could use baking soda and DC to clean it too
[16:20:45] <CaptHindsight> 2 pitman arm pullers and the oxy-propane torch and it's apart!
[16:21:16] <CaptHindsight> http://imagebin.org/283555
[16:22:19] <CaptHindsight> Mapp gas torch just wouldn't get it hot enough
[16:23:35] <eric_unterhausen> what is that?
[16:23:42] <NickParker> mm just kidding seems i still do brick it. back to fiddling with ISE
[16:23:52] <eric_unterhausen> looks like the gear puller might have seen better days
[16:23:55] <JT-Shop> what is that pitman arm from?
[16:24:03] <CaptHindsight> heh, broke two of them
[16:24:13] <CaptHindsight> Land Cruiser
[16:24:16] <JT-Shop> if it was my gear puller I'd put it in the Mccoys bucket
[16:24:59] <eric_unterhausen> reminds me of something I did once. Got it apart and then someone showed me how it unscrewed
[16:25:09] <CaptHindsight> they look the same but some brands don't harden the pullers
[16:26:16] <eric_unterhausen> how do the cat right angle heads work? They all look like there is a part missing
[16:27:25] <eric_unterhausen> http://www.ebay.com/itm/TECNARA-RIGHT-ANGLE-MILLING-HEAD-ATTACHMENT-CAT-50-/331074492490?pt=BI_Tool_Work_Holding&hash=item4d1593d84a
[16:27:45] <eric_unterhausen> like that, is the anti-rotation attachment standard?
[16:28:23] <CaptHindsight> it's not shown
[16:28:32] <eric_unterhausen> none of them come with one
[16:28:38] <eric_unterhausen> from what I can tell
[16:28:56] <eric_unterhausen> seems like the prices would be fantasy in that case
[16:36:14] <eric_unterhausen> I guess the call for a right angle attachment on a CNC would be minimal
[16:38:11] <CaptHindsight> wow everything just closed around here except for the liquor store :)
[16:40:13] <CaptHindsight> JT-Shop: how is your plasma table working out?
[16:41:07] <CaptHindsight> I'm not sure what to build next. Considering a router for sheet metal, laser or plasma cutter
[16:41:46] <JT-Shop> works good, I'd make a few minor changes if I built another one
[16:42:01] <JT-Shop> I've been using it for a few years now
[16:43:04] <JT-Shop> http://www.youtube.com/watch?v=e70jdiDm7yc
[16:43:22] <CaptHindsight> what are you using for the plasma?
[16:43:23] <JT-Shop> http://www.youtube.com/watch?v=knf3cPrZPrk
[16:43:35] <JT-Shop> Hypertherm 1250
[16:43:47] <JT-Shop> I think they have a new model number system now
[16:44:41] <CaptHindsight> I need something big enough for 4 x 8 sheets
[16:45:21] <JT-Shop> I can cut 4 x 8 sheets but I can only cut 4 x 3 then shift the sheet, saves tons of floor space for me
[16:46:49] <JT-Shop> http://gnipsel.com/shop/plasma/plasma.xhtml
[16:50:26] <CaptHindsight> http://gnipsel.com/shop/plasma/z-axis-02.xhtml
[16:51:34] <CaptHindsight> JT-Shop: how thick can that cut in steel?
[16:53:38] <JT-Shop> the 1250 can cut 1/2" pretty cleanly
[16:53:46] <CaptHindsight> nice
[16:54:25] <NickParker> This license error when I launch SDK isn't causing my issue is it? http://pastebin.com/vDJ9JiiL
[16:55:17] <JT-Shop> CaptHindsight, so you think putting a solution of water and sodium nitrite in my gas tank will cause a problem?
[16:56:11] <CaptHindsight> JT-Shop: not for the tank, I'm just wondering what else might be in there
[16:56:24] <CaptHindsight> the level indicator, pump, etc
[16:56:35] <JT-Shop> you mean like residue and junk?
[16:56:47] <JT-Shop> oh, this is a 1956 Ferguson F40 tractor
[16:56:57] <JT-Shop> just a tank
[16:57:15] <CaptHindsight> heh, then I wouldn't be concerned
[16:59:19] <JT-Shop> yea, I just want to clean it out while it is off the tractor as I get a bit of rust in the fuel bowl after a while
[17:01:51] <CaptHindsight> Borax is another DIY rust remover
[17:03:28] <CaptHindsight> borax and vinegar
[17:04:06] <JT-Shop> yea, I have a 20 gallon tank of sodium carbonate to clean smaller parts
[17:08:00] <tjb1> Hypertherm <3
[17:08:23] <JT-Shop> ?
[17:14:46] <tjb1> ?
[17:26:34] <JT-Shop> apod.nasa.gov/apod/ap130424.html
[18:28:32] <nsp> has anyone ever used those tb6560 boards?
[18:30:54] <CaptHindsight> nsp: several have
[18:31:25] <CaptHindsight> they usually modify them for better better speeds and less noise
[18:31:42] <nsp> do they work ok? I looked on youtube and someone looked like they just did a standaard parallel port setup and normal prepackaged settings
[18:31:49] <nsp> with very little setup trouble
[18:32:01] <nsp> i got a few free laying around and thinking of making this annirouter
[18:32:15] <CaptHindsight> they are for small steppers
[18:32:22] <CaptHindsight> also noisy
[18:36:21] <nsp> i saw a guy run them with nema 23
[18:36:29] <nsp> fair size motors
[18:40:12] <CaptHindsight> ~3A max
[18:41:10] <CaptHindsight> http://www.ebay.com/itm/CNC-Router-One-1-Axis-3-5A-TB6560-Stepper-Stepping-Motor-Driver-Board-Controller-/331091881724?_trksid=p2054897.l4276
[18:46:09] <kengu> what kind of voltages you can run with those tb6560 ones
[18:47:59] <nsp> so u can run those other drivers off of the built in drivers on the tb6560 if you want to go higher?
[18:52:21] <nsp> or is that just the motor driver with a built in pcb
[18:52:30] <nsp> ah i see its just the chip?
[18:52:57] <Tom_itx> http://www.toshiba.com/taec/components2/Datasheet_Sync/201103/DST_TB6560-TDE_EN_27885.pdf
[18:53:39] <Tom_itx> VDSS 40v
[18:55:47] <nsp> I see, thanks tom
[18:56:34] <Tom_itx> maximum
[18:57:16] <nsp> anybody have any idea on how to calibrate a scara arm
[18:57:38] <Tom_itx> there have been a couple here with them
[18:58:25] <nsp> ya, ive got mine all set and wired up. I can get it to move when i tell it to and it shows up in lcnc but the pid isnt tuned and the revs per joint arent tuned to the correct values
[18:58:40] <TekniQue> it's a bit retarded that the specs on that ebay listing don't tell you what kind of voltage that thing tolerates
[18:59:49] <Tom_itx> i didn't read far enough to know about clamping diodes on the outputs either
[19:01:38] <nsp> its weird for my motors i should be able to find encoder tics per rev and just set that number but the motors are too hard and old to find exactly what model they are
[19:01:47] <nsp> ive found similar but not the exact one
[19:03:53] <CaptHindsight> TekniQue: there are a bunch of boards with similar designs, some don't even have data sheets just the PCB silkscreen with G, 24V+, A- A+ B- B+ etc etc
[19:07:00] <CaptHindsight> http://www.sainsmart.com/catalogsearch/result/?q=tb6560
[19:07:45] <TekniQue> I blew up a chinese stepper driver by overvoltage
[19:07:53] <TekniQue> it used some integrated circuit
[19:08:42] <CaptHindsight> probably tb6560, they destruct if you remove the motor leads when under power
[19:11:17] <CaptHindsight> http://www.sainsmart.com/3d-printing/3d-printing-modules/sainsmart-a4988-stepper-motor-driver-3d-printer-carrier-for-reprap-ramps-prusa.html
[19:11:18] <TekniQue> my engine dyno uses a nema23 motor to turn a ball valve that adjusts the water flow through the water brake
[19:11:28] <CaptHindsight> lots of these in the reprap world
[19:11:55] <TekniQue> and when I was testing that out with a variable power supply I found it worked smoothest with lots of voltage
[19:12:01] <TekniQue> before the driver blew up
[19:12:26] <TekniQue> so I ended up using a 48V power supply when I rigged it up
[19:12:31] <nsp> lol
[19:12:49] <TekniQue> and got a driver with enough voltage rating
[19:13:19] <CaptHindsight> http://www.automationtechnologiesinc.com/products-page/kl-stepper-drivers these are about 1,000,000 times better for a few $$ more
[19:13:50] <TekniQue> KL-5056 is what I use now
[19:13:51] <CaptHindsight> well 1,000 x at least
[19:14:05] <nsp> whats the difference in the circuitry
[19:14:18] <CaptHindsight> better design
[19:14:22] <TekniQue> nsp: these use discrete mosfets for the drive
[19:14:33] <TekniQue> and integrated circuits for control
[19:14:58] <CaptHindsight> http://www.leadshine.com/producttypes.aspx?type=products&category=stepper-products&producttype=stepper-drives
[19:15:04] <TekniQue> I have a 9082 also, that one has a temperature controlled fan on it
[19:15:05] <CaptHindsight> where they are actually from
[19:15:09] <nsp> instead of the tb6560 is actually an ic chip used for the drive for the other driver?
[19:16:23] <TekniQue> yes
[19:16:44] <CaptHindsight> http://www.stevenson-engineers.co.uk/files/l_g_reverse.jpg
[19:16:56] <CaptHindsight> http://www.cnczone.com/forums/attachments/stepper_motors_drives/144525d1364342312t-difference_leadshine_m542_ican_2m542-img_1767.jpg
[19:17:31] <CaptHindsight> http://www.cnczone.com/forums/attachments/stepper_motors_drives/144528d1364342312t-difference_leadshine_m542_ican_2m542-img_1775.jpg
[19:17:46] <TekniQue> this is the chip used in the 5056: http://www.freescale.com/files/dsp/doc/data_sheet/MC56F8013.pdf
[19:17:55] <CaptHindsight> http://www.stevenson-engineers.co.uk/files/l_g_front.jpg
[19:18:00] <nsp> oh very cool
[19:19:50] <CaptHindsight> http://www.mycncuk.com/forums/attachments/motor-drivers-controllers/6197d1340615555-m542-driver-msd542-1.jpg
[19:20:25] <CaptHindsight> chip numbers removed with a dremel
[19:20:36] <nsp> why
[19:21:12] <CaptHindsight> maybe they wanted an extra day or two before someone in China copied them
[19:23:13] <nsp> hahahah
[19:29:09] <nsp> any ideas on how to empirically find the encoder tics per rev on these servos i have
[19:31:20] <CaptHindsight> nsp: it's xmas, I only have magical methods today :)
[19:32:20] <nsp> ha, i could use some magic to get this arm working....
[19:34:45] <CaptHindsight> you don't have a servo board there?
[19:35:24] <CaptHindsight> it's easy if you have a counter
[19:37:37] <nsp> im runing the servos through a mesa 7i43
[19:37:37] <CaptHindsight> hook it up and check the count
[19:37:37] <CaptHindsight> bbl
[20:17:03] <nsp> anyone know how to tune servo pid
[20:18:07] <nsp> 1) increase P until output oscillates 2) increase D until output stabilizes 3) increase I to get to the set point quicker