#robotics Logs

Mar 31 2015

01:15 rue_shop3 even at 150% speed }:)
01:21 Anniepoo 8cD
01:21 Anniepoo rue, what was the issue?
01:22 Anniepoo cause I've got a CNC router that's 'slipping', I'm looking for things that might be causing
01:41 rue_house whats your stepper current?
01:41 rue_house whats the motor rating?
01:45 rue_house armyofevilrobots, its almost 11:30
01:54 Anniepoo sorry, was afk - I didn't build the system, I'll go look, hang on
01:55 rue_house hmm, did you just buy it built?
01:55 rue_house if so, it could be anything, tho I suppose...
01:55 rue_house what have you looked at?
01:56 Anniepoo 2.8A
01:57 Anniepoo it bit twiddles a parallel port, so the first suspect was that the port wasn't in ECP mode
01:57 rue_house how many motors are on the printer?
01:57 Anniepoo but it is
01:57 Anniepoo it's not a printer, its a CNC router
01:57 Anniepoo 3
01:57 rue_house ugh
01:57 rue_house k
01:58 rue_house well, in order for me to help, I need to know everything about the machine
01:58 rue_house so post a whole page of images and diagrams of everything
01:58 Anniepoo whats the physics of this mode of slipping?
01:58 rue_house could be lots of things
01:58 rue_house steppers torque goes down as speed goes up, so you could be running them too fast
01:59 rue_house they cant accelerate instantly, so the acceleration in the software could be set too high
01:59 Anniepoo thats true - that is, it runs fine if run at ridiculously slow speed
01:59 rue_house the mechanisms could be jamming
01:59 Anniepoo that's been checked (jamming)
01:59 rue_house there could be electrical noise caused by any of 10000000 things dropping out or inducing extra steps
01:59 Anniepoo the acceleration could be off -
01:59 rue_house the power supply could be dipping out
02:00 Anniepoo ooh, good idea - I'll check it
02:00 rue_house there could be a bad motor connection
02:00 Anniepoo no, it's happening on all 3 axes
02:00 rue_house the connection on the motor could be loose and slipping
02:00 Anniepoo but they're hooked up with 18 guage wire
02:00 rue_house like I said, make a webpage with all the information about the machine and I'll try to help more
02:01 Anniepoo ok, thanks
02:01 rue_house but right now, I'm 2 hours late for bed!
02:01 Anniepoo for now I'm just curious how decreasing the series resistance in the motor wire prevents dropped steps
02:01 Anniepoo ok!
02:02 Anniepoo I'll ask on some CNC forums, but if no joy there, I'll be back - thanks for the offer!
03:18 Hyratel http://www.newegg.com/Product/Product.aspx?Item=9SIA2ZZ18J8914&cm_re=ip_network_camera-_-0XR-0076-00083-_-Product
09:19 rue_house yea, but its 640x480
09:19 rue_house prolly with a cheap lens
09:19 rue_house want to know what that looks like?
09:20 rue_house http://ruemohr.org/~ircjunk/images/335_cleannow.jpg
09:20 rue_house ^^ LOOK ^^ LOOOK!!!!
09:20 rue_house THAT is your 640x480 with an ugly lens
09:21 rue_house your better off finding one that outputs ASCII art
09:37 armyofevilrobots @rue_house; blurry photo, allegedly of your workshop.
09:37 myofevilrobots not convi
09:37 armyofevilrobots convinced even.
09:38 rue_house I'm having trouble working out where I can "just post" the ascii conversion
09:46 rue_house http://ruemohr.org/~ircjunk/images/ascii_335.html
09:47 rue_house see, the image is better after its been converted to ascii art
09:47 rue_house oh god, I'm late
19:50 rue_house arg, I have to go back to work again
20:20 Tom_itx because you were late this morning?
23:44 rue_house no I had to work late
23:44 rue_house 3 extra hours
23:45 rue_house casue there aren't enough of mes