On Wednesday 29 November 2006 21:54, [EMAIL PROTECTED] wrote: > So we can review it, can you paste your ini file and > you hal file(s) on www.pastebin.ca, and post a link
http://pastebin.ca/262379 http://pastebin.ca/262384 > Please make sure your following error limits are set to > well under a half a turn of the motor. Usually you can set > the limit to maybe a 50th of a turn. Bingo! The current limits are 1.0 & 0.010, which doesn't match either of the two original stepper ini files. Looks like an obvious brain cramp on my part. I don't know what, if anything, I was thinking. I'll tighten those up before doing anything further. The Sherline is 0.050 per turn, so max and min should be, say, 0.001 and 0.0002? Seems awfully tight, given what's in the original stepper_xyza.ini file: 0.050 and 0.010. I evidently have two unrelated problems: the direction glitch and a hole in my foot. Dang that footgun! > Does it seem to happen more on one axis or another? Nope, it seems equally distributed. The cam is symmetric across the Y axis and the largest drift is toward -Y, which is what I'd expect from lots of fiddly Y-axis motions with an occasionally low direction signal. The other axes also drift in the "low direction signal" direction. The most glaring error, however, happens when the final G0 Z upward jog that's supposed to clear the clamps goes the wrong way and gnaws into the fixture at full speed... > so far I've only seen it happen at the start of the very > first jog, and the step pulses issued (including the > "glitchy" one) seem to occur only at low speeds I've also seen incorrect motion at the end of a move, but I have absolutely no hard evidence to back that up. It looks like a really abrupt halt or reverse jerk, so the glitch could be longer than a few step pulses and happen well before the actual end of the step pulse sequence. That could just be my bogus FERROR settings at work, so unless / until I can present some solid evidence, concentrating on the leading edge makes perfect sense. > I understand that you've observed the signals with a real > scope, which tends to rule out the drives and cabling. Yup, it's there at the parallel port output pins and has nothing to do with the machinery. One less thing to worry about, if that's any consolation. Verily, there's nothing like a good new problem to take your mind off all your old problems... -- Ed ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
