#linuxcnc | Logs for 2013-03-31

[00:00:03] <Connor> wow, those look old.. :)
[00:00:25] <andypugh> I imgaine they were _colossaly_ expensive when they were made (before I was born)
[00:01:02] <andypugh> (there are several pages, scroll down)
[00:01:18] <Connor> I did. Looks like they're mechanical...
[00:01:19] <Connor> wow.
[00:04:16] <Connor> now, to figure out now to mount these encoders to the motors...
[00:04:45] <Connor> I may have to make new drive pins.. they only go up to 8mm.. and the pin is closer to 9..
[00:04:50] <andypugh> Googling them found me all sorts of stuff. They are "General Precision" which is the "GP" in the LGP-30 http://en.wikipedia.org/wiki/LGP-30 which is the drum-memory computer in the programmer-folklore tale of Mel: http://en.wikipedia.org/wiki/The_Story_of_Mel
[00:04:52] <Connor> might be able to turn it down..
[00:08:47] <Connor> it's going to cost a small fortune to build this freaking arm.. $50.00 a pop for the encoders... each motor needs it's own H-bridge, and then the motor itself..
[00:10:15] <Connor> and then some sort of micro for them.. maybe 1 for each.. or one large one..
[00:10:49] <andypugh> Do you want these Librascope things? I paid £17 for all three, and they are lovely old things.
[00:11:08] <Connor> andypugh: I haven't a faintest idea what I would do with them... :)
[00:11:43] <andypugh> Put them on the motors (geared down) and have absolute position to 13 bits?
[00:13:14] <Connor> honestly.. I think they're a bit bulky.. i'm not sure how I would use them.. I kinda need through shaft design like that AMT203
[00:15:25] <andypugh> They are quite small, but if I can't give them away, I wlll keep them :)
[00:15:43] <Connor> You'll find something to use them for.
[00:27:13] <andypugh> Time to get up, (6am) but as I haven't slept yet, I think I will do the opposite. Night, err, moning all.
[01:59:53] <Jymmm> Would it be sacrilege to convert my IBM Model M to USB?
[02:44:51] <fragalot> Jymmm: just clip on an adapter
[02:45:31] <Jymmm> fragalot: I guess
[03:10:30] <DJ9DJ> moin
[03:38:36] <Loetmichel> mornin'
[04:04:48] <ReadError> hey guys
[04:04:58] <ReadError> is there anything i can use to measure lines in gcode?
[04:21:53] <Vq> How many lines and how often?
[04:23:41] <ReadError> well
[04:23:52] <ReadError> i was just wondering if theres "digital calipers" i could use
[04:23:58] <ReadError> to check my gcode output
[04:26:42] <Vq> I don't know of any.
[06:42:03] <r00t4rd3d> you wanna measure your code?
[06:42:13] <r00t4rd3d> ReadError
[06:42:43] <r00t4rd3d> wtf you doing up at 5am messing with that shit anyway
[06:44:21] <Tecan> bing
[06:45:34] <jthornton> bong
[06:47:37] <ReadError> r00t4rd3d i work diff hours
[06:49:17] <r00t4rd3d> selling crack on the night shift?
[06:49:27] <Spida> r00t4rd3d: what timezone?
[06:49:33] <r00t4rd3d> eastern
[06:49:58] <ReadError> r00t4rd3d you know it
[06:50:05] <Spida> gmt+2 here *g*
[06:54:47] <r00t4rd3d> you got all the dxf's for a quad copter done yet?
[08:12:23] <IchGuckLive> is the THC volts in AC or in DC 116 as on datasheet ?
[08:44:00] <r00t4rd3d> does the thc use a battery?
[08:44:56] <IchGuckLive> myne ? i use a Voltmeter but i got nothing
[08:44:56] <r00t4rd3d> what is listed for the volts? #
[08:50:49] <IchGuckLive> volt V
[08:50:55] <IchGuckLive> nothing in the sheet
[08:58:24] <archivist> how does the world know what datasheet is being looked at
[09:00:18] <IchGuckLive> i use a hypertherm plasma powrmax 45
[09:06:39] <Tom_itx> jthornton, atmel chip selector: http://tinyurl.com/c9dhrho
[09:08:51] <Tom_itx> if you have specific requirements
[09:13:15] <IchGuckLive> do i need to load the comp in a hal or is the comp inside linux now
[09:13:24] <IchGuckLive> if i did "sudo comp --install thcud.comp
[09:13:33] <IchGuckLive> im not getting a error but it also not woekingv
[09:33:05] <IchGuckLive> jthornton: ?
[10:05:41] <IchGuckLive> hi servos4ever
[10:06:10] <IchGuckLive> my cheef is asking for more pricise on the stepper so servo will be the expensiv option
[10:07:00] <IchGuckLive> servos4ever: is it posible to go for stepdir so i need no other electronics for the mashine ony the servo and the driver
[10:07:09] <IchGuckLive> or is this also garbige
[10:11:57] <andypugh> I don't see any fundamental problem with controlling a serve with a step/dir pulse train. If you use a velocity-mode stepgen it is just anouther way to send speed/direction data and not fundamentally different to any other way of controlling a servo.
[10:18:13] <pcw_home> Its certainly possible to run step/dir servos with just a parallel port (either closed or open loop)
[10:18:15] <pcw_home> The limitation is step rate vs servo resolution and encoder count rate for closed loop systems
[10:18:28] <IchGuckLive> istill have no return data then does the controler backup the pulses
[10:19:02] <pcw_home> Yes you use the servo just like a step drive
[10:19:16] <IchGuckLive> so what is the goal then
[10:19:26] <IchGuckLive> spend more money
[10:20:04] <IchGuckLive> one servo 400W is more then 3 Stepper at 12Nm with drives
[10:21:33] <pcw_home> If you are ok with the step rate limits and lack of feedback to LinuxCNC,
[10:21:35] <pcw_home> a servo driven in step/dir mode is scaleable to much larger sizes than a step motor
[10:22:13] <pcw_home> and will give a reliable fault signal ifs stalled
[10:25:17] <IchGuckLive> thanks is the cable Standarisised to get them on the 7i77
[10:26:20] <IchGuckLive> there is a 7i76 in so step dir is ok
[10:26:35] <IchGuckLive> but i think with servo better to go as far as 7i77
[10:26:53] <IchGuckLive> and pull all sig throu the system
[10:27:17] <IchGuckLive> i still hope that the price is to high for him to pay of
[10:27:35] <IchGuckLive> 12Nm is a bounchh of force
[10:27:46] <ReadError> i was thinking about putting a nema34 on my Z axis
[10:28:01] <ReadError> do they make breakout boards where i can easily pinout those pins?
[10:28:06] <Tom_itx> why not put a counterweight on it instead?
[10:28:30] <ReadError> me? its a heavy Z axis
[10:28:44] <Tom_itx> so are elevators
[10:28:49] <Tom_itx> they use counterweights
[10:30:58] <archivist> you need grunt to accelerate a large mass
[10:32:07] <IchGuckLive> do i need a servotread for a rtpi comp in hal or just loadrt
[10:36:32] <pcw_home> you normally need to attach the component to a thread with addf
[10:50:00] <IchGuckLive> i wait till jthornton is here its his comp and im not getting it to work
[10:50:38] <IchGuckLive> i try to hijack Z with a pyvcp button
[10:50:56] <IchGuckLive> manual THC
[10:51:04] <IchGuckLive> with a voltmeter
[10:51:08] <IchGuckLive> O.O
[10:51:17] <IchGuckLive> B)
[10:51:22] <IchGuckLive> coffee time By
[10:52:03] <skunkworks> Mmmm coffee
[11:40:29] <andypugh> Mwahaha! I just won a "Renshaw" probe on that eBay. I suspect that a "Renishaw" one would have been a lot more expensive :-)
[11:41:39] <Tom_itx> i bet
[11:48:02] <andypugh> Hmm, it appears to have an inductive transmission system. That might be interesting. (or it might just get removed)
[11:49:07] <Tom_itx> we had one with IR mounted in the cnc
[12:01:35] <skunkworks> pcw_home: how flexable is the 5i20 - how many pwm gens vs encoder counters.. Could you theoretically run a pwm + dir amp system with it (with ttl encoders...)
[12:01:42] <skunkworks> *5i25
[12:12:03] <pcw_home> skunkworks: Yes (there are 5I20 and 5I25 configs for that)
[12:12:40] <pcw_home> 5I20 with 7I52-S 5I25 with 7I85-S
[12:16:28] <pcw_home> 7I52-S = 6 TTL/DIFF encoder inputs, 6 PWM/DIR outputs
[12:16:30] <pcw_home> 7I85-S = 4 TTL/DIFF encoder inputs, 4 PWM/DIR outputs, 1 sserial exp port
[12:16:57] <pcw_home> (of course PWM/DIR can be STEP/DIR as well)
[12:17:33] <ReadError> any gecko 540 users here?
[12:17:45] <ReadError> was wondering if i could remap my z axis to some of the aux pins
[12:17:50] <ReadError> since i only need 2
[12:18:03] <ReadError> to use an external driver instead of the built in one
[12:18:41] <IchGuckLive> just open the case and conect to the opo outputs
[12:23:30] <pcw_home> or insert a little M-F DB25 cable and break put the wires
[12:23:48] <ReadError> yea i was thinking their is some breakout adapter
[12:23:59] <ReadError> that i could just run inline and tap the 2 pins
[12:24:43] <ReadError> https://dl.dropboxusercontent.com/u/25091878/Photo%20Mar%2031%2C%2012%2059%2007%20PM.jpg
[12:24:49] <ReadError> my latest project
[12:28:06] <IchGuckLive> doesent need the rotors to be crossed by color
[12:28:23] <IchGuckLive> as they are left and right
[12:29:23] <IchGuckLive> diagonal B)
[12:29:34] <ReadError> green = front
[12:29:36] <ReadError> red = rear
[12:29:40] <ReadError> orange*
[12:29:50] <ReadError> but this is for FPV, so it doesnt matter much
[12:30:51] <DJ9DJ> re
[12:32:46] <IchGuckLive> ReadError: did you already fly it
[12:32:57] <ReadError> yea
[12:54:12] <DJ9DJ> re
[12:54:15] <IchGuckLive> now as the sun sets it is getting clear after a bad weather day on easter
[13:01:21] <IchGuckLive> by for today
[15:32:13] <LeelooMinai> Any idea why a counterbore bit for M6 screw has 6.2mm pilot?
[15:38:21] <andypugh> LeelooMinai: Because 6.2 is the standard screw clearance size.
[15:38:39] <andypugh> I have seen conterbores with 6.5mm pilots, but that seems too sloppy to me,
[15:39:17] <skunkworks> https://www.youtube.com/watch?v=PC3N-uadAk0
[15:39:26] <LeelooMinai> Hmm... I guess I am confused about the order this is done... Doesn't a tapped M6 hole have more like 4.2mm clearance?
[15:39:42] <LeelooMinai> 5mm that is*
[15:40:23] <andypugh> There isn't much call for a tapped, counterbored, hole.
[15:40:49] <LeelooMinai> O, wait...
[15:41:43] <LeelooMinai> Right... for some reason I was thinking that the hole will be tapped, but you are right - I just need clena hole and I will tapp the other plate
[15:42:39] <andypugh> And the 6.2 clearance size gives you a bit of wiggle room if your taped holes aren't in exactly the right place.
[15:43:18] <LeelooMinai> Hmm... but now that seems a bit small - I mean, if I want to adjust the position later a bit, isn't 0.2mm a small room for adjustment?
[15:43:50] <LeelooMinai> Also... how do I drill 6.2mm hole:)
[15:44:43] <skunkworks> we did some work for a guy that always did things manually.. He went 1/8 bigger in clearance holes. when we did the parts on the cnc we used fractional bigger (1/32 iirc).. He was so surprised that everything went together...
[15:46:23] <LeelooMinai> Ok, I am a bit new to all of this, but I am designing CNC machine. I bought, what I believe correct drills for tapping: 4.2mm, 5 and 6.8, but now I have to use some sane drills for those pilot holes
[15:47:08] <LeelooMinai> As I see that they have those 6.2mm pilots on couterbore bits... If I drill larger holes, those bit will not center, right?
[15:47:37] <LeelooMinai> http://www.aliexpress.com/item/Free-Shipping-New-1pcs-4-Flute-HSS-AL-Counterbore-End-Mill-6-2X10-4mm-M6-metric/620693003.html
[15:47:54] <LeelooMinai> ^ THis is the counterbore I am talking about
[15:48:38] <LeelooMinai> Or maybe I could drill twice or something? First 6mm, then use this counterbore, and then use another bit to enlarge the 6mm one?
[15:49:40] <pcw_home> probably want a 6.2 mm drill (they are standard)
[15:50:35] <LeelooMinai> Right... I am worried though that this will prevent me from any adjustment therafter
[15:51:04] <LeelooMinai> Not sure if I will be able to make everything fit that precise using the tools I have
[15:52:43] <pcw_home> You could drill the 6.2 hole out larger later, but it will keep the counterbore concentric with the hole
[15:53:10] <LeelooMinai> Right, ok, thx - I guess I will need to chase those 6.2mm drills
[15:54:24] <gene77> I'll bite, whats wrong when code that runs great in sim mode, claims the vars I assign at the top of the file are "read only" when loaded on the real machine?
[15:54:32] <gene77> I own the file BTW
[16:31:28] <andypugh> LeelooMinai: Use 6.5mm. Especially if drilling by hand.
[16:32:06] <andypugh> (If you have 6.5 and not 6.2)
[16:33:18] <andypugh> And the trick is often to drill through both parts with the tapping drill, then enlarge the clearance hole in just the top part.
[16:34:24] <andypugh> Alternatively, if the top hole already exists, spot through with the clearance drill to make a starting dimple for the tapping drill.
[16:35:36] <DJ9DJ> gn8
[16:57:50] * Tom_itx thinks jthornton's been painting easter eggs all day
[17:11:50] <andypugh> I have not paid any attention at all to the Easterness of today. Not even to the extent of eating chocolate.
[17:19:59] <r00t4rd3d> todays easter/
[17:20:00] <r00t4rd3d> ?
[17:20:28] <r00t4rd3d> stupid religious holidays
[17:20:49] <andypugh> No holidays are stupid :-)
[17:21:35] <r00t4rd3d> especially Ramadan
[17:22:36] <r00t4rd3d> dwi arrest in my town:
[17:22:42] <r00t4rd3d> "Mr. Meeks allegedly asked a deputy to "stop at the Fairground Inn so he could have a beer," according to police documents."
[17:22:56] <r00t4rd3d> on his way to jail
[17:23:22] <r00t4rd3d> after a foot chase
[18:29:51] <r00t4rd3d> https://www.google.com/intl/en/landing/nose/
[18:31:10] <L84Supper> http://phys.org/news/2013-03-tokyo-smelling-screen-demo-scents-virtual.html perfect for these
[18:32:04] <L84Supper> I wish I had a camera that captures odors, sometimes an odor is worth a 1000 pictures
[18:40:18] <andypugh> Clearly Google work in GMT :-)
[18:42:34] <pcw_home> Hey that link lead me to a article about the impedance of free space
[18:42:36] <pcw_home> being determined by the virtual particle density, which is just plain amazing
[18:49:28] <r00t4rd3d> i wish smart devices could detect and emit scent. I would IM everyone farts.
[18:50:43] <r00t4rd3d> sunday 8pm and reddit is broke, shocker
[19:33:09] <tjb1> r00t4rd3d:
[19:57:22] <tjb1> r00t4rd3d:
[20:06:56] <r00t4rd3d> ?
[20:07:03] <r00t4rd3d> tjb1
[20:07:04] <r00t4rd3d> tjb1
[20:07:35] <r00t4rd3d> you know you can do /notice nick message and its sent to just me/
[20:07:36] <r00t4rd3d> ?
[20:09:10] <r00t4rd3d> now what you want
[20:20:38] <BHSPiMonkey> grbl really doesn't like me
[20:23:05] <skunkworks> BHSPiMonkey: why can't you just use linuxcnc?
[20:41:47] <tjb1> r00t4rd3d:
[21:09:41] <r00t4rd3d> http://store.qwerkeys.co.uk/collections/frontpage
[21:15:06] <BHSPiMonkey> skunkworks: I don't even know how I could go about that; I haven't been doing this very long and I've stuck to the standard shapeoko implementation thus far
[21:15:26] <BHSPiMonkey> with the exception of using an all-in-one controller instead of an arduino
[21:23:05] <r00t4rd3d> http://www.ebay.com/itm/3-Axis-TB6560-CNC-Stepper-Motor-Driver-Board-Controller-/221194934966?pt=LH_DefaultDomain_0&hash=item33803edab6
[21:23:18] <r00t4rd3d> those are cheaper then a legit Arduino
[21:23:36] <r00t4rd3d> and a grbl shield
[21:24:50] <r00t4rd3d> http://www.ebay.com/itm/New-3-Axis-TB6560-Motor-Driver-Stepper-Board-Controller-With-Box-For-CNC-Router-/261188446908?pt=LH_DefaultDomain_0&hash=item3cd00b6abc
[21:25:03] <r00t4rd3d> thats the newest revision for a bit more
[21:37:00] <r00t4rd3d> http://mail.google.com/mail/help/intl/en/promos/blue/index.html
[21:40:41] <tjb1> r00t4rd3d:
[21:57:57] <r00t4rd3d> ?
[22:05:17] <tjb1> r00t4rd3d: !
[22:06:52] <TheLarch> (8 year old operating a Flexicam CNC) http://www.youtube.com/watch?v=ZcvDxvOi2Mk this kids not lazy, she just doesn't like safety gear
[22:06:53] <Tecan> (ZcvDxvOi2Mk) "8 year old operating a Flexicam CNC" by "Daniel Antes" is "Tech" - Length: 0:01:12
[22:16:11] <L84Supper> http://www.alioindustries.com/custom-motion-systems.html
[23:46:59] <r00t4rd3d> what are the cnc machines called that the spindle can move all over
[23:48:03] <r00t4rd3d> 5 axis is all i can think of
[23:49:46] <r00t4rd3d> but where the spindle is on like a robotic arm
[23:50:55] <toastyde2th> hexapod?