At 11:56 AM 3/25/2010, you wrote: >At 165 pounds, it may be that the gantry is actually taking up some backlash >as its stopping from the longer moves which would be faster. Can you, as its >hooked up & the motors enabled, induce a motion visible on the indicator by >manually pushing or pulling it? And, equally important, does this 'slack' >remain constant as you move it with the motors? If constant, then perhaps >adding some backlash comp might help (but that's only effective for motion >reversals of course), or if its position related, it might be possible to map >the screws error. Wear patterns can be elusive, and mapping a cyclic error >can be 'fun' for some definitions of fun. If you have many hours on the >machine doing the same cuts over and over it might even be advisable to >replace the screws. Or if the cutting dust can get to them, a really good >cleaning might help.
I'll give it a try manually moving the machine while the motion control system is up and running. Haven't tried that as of yet. It's a brand, spankin' new machine that has not cut anything yet, so if there's wear patterns anywhere, it'll be on my forehead where I've been rubbing in consternation... ;-) > > I disconnected the pinion gears from the racks, moved the gantry > >back and forth the length of the X axis a few times by hand, and > >didn't really notice any binding. It seemed pretty smooth, and > >relatively easy to move a 165 lb gantry on the rails. > >Pinion gears, same thoughts about cleaning apply. I assume they are >preloaded? Pinions are preloaded. Here's the R&P setup: <http://www.cncrouterparts.com/product_info.php?cPath=21&products_id=50> >Cheers, Gene >"There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." >-Ed Howdershelt (Author) > >All that glitters has a high refractive index. Mark ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
