On Tue, 7 Apr 2009 19:59:17 -0500, you wrote: >On Wed, Apr 08, 2009 at 12:22:52AM +0100, Steve Blackmore wrote: >> >> A couple of questions though, using halscope, pulses are clean and even, >> but custom panel spindle speed indicator readout jumps about quite a >> bit? > >How are you generating the signal for the indicator? If it's a ddt of >the encoder counts, you'll get quantization. This is the same problem >being discussed in the pid-D-velocity thread. In your case, running >the ddt in a much slower thread will alleviate that. The slower >response is the tradeoff, but even a .2 or .5 second thread is >entirely adequate for a visual indicator.
Stepconf did the configuration, I assume it just reads the index signal? >> Also when slowing down, spindle overshoots badly then comes back to >> commanded speed. > >The signal out of EMC isn't doing this, so you will have to look >into how to fix it on whatever drive electronics you have. >Sometimes there is a setting. EMC isn't helping. There is no acceleration/deceleration setting I can see in the hal or ini files produced and spindle inertia and emc are fighting each other. A 30lb chuck slowing from 3000 rpm to 200 rpm instantly is never going to happen without a brake, the minimum decel in the VFD is 1 second. Doesn't happen with Mach as it uses acceleration/deceleration curve. Steve Blackmore -- ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
