On Tue, 13 Oct 2009, Chris Morley wrote: > Date: Tue, 13 Oct 2009 03:59:05 +0000 > From: Chris Morley <[email protected]> > Reply-To: EMC developers <[email protected]> > To: EMC DEV <[email protected]> > Subject: Re: [Emc-developers] hostmot2 stepping folowing error oddity > > > >> >> >> Is it possible you simple dont have enough hardware headroom to reach you max >> velocity? With 200 usec StepLen and 200 uSec StepSpace, the maximum step rate >> the hardware can generate is = ~2500 Hz, I just glanced at the ini file but >> doesn't a Scale of 2800 mean 2800 steps per inch? If so the maximum velocity >> should be about 10% less than 2500/2800 (10% for headroom). about .8 inches >> per second. >> >> >> Peter Wallace >> Mesa Electronics >> > > yes 2800 steps per inch. > I don't doubt your math. You would think it should error all the time. > but running in the negative direction is definitely worse then positive. > I wouldn't think that should make a difference. > and why would jogging (at say 25 ipm) be worse then G0 moves at > 100 ipm > How is jogging planning different from G0 moves ? > Is there two things going on here? > I thank you guys for checking this out.
Your plot suggests running out of headroom also, at least as far as I can tell by setting a straight-edge along the blue trace. The ferror starts when the slope of the blue line (which is step generators velocity) looks to be maxed out (it looks like a straight line). > > _________________________________________________________________ Click less, chat more: Messenger on MSN.ca http://go.microsoft.com/?linkid=9677404 Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
