Hi all, IRC seems pretty dead this morning so I'll try here. I seem to remember cradek doing a velocity to dac signal to emulate a tach. However I cannot seem to find documentation. Board is a 5I20 running hm2 so the velocity signal should be there. I just need the hal commands to get started.
I've been using a Keling 750 W servo motor with a 2:1 and a 10 mm pitch ballscrew to drive the Z on my Cinci contourmaster. In torque mode I have stability problems; I finally ended up getting the following error down to about .002 ... pretty bad .. and that is after about 8 hours of tuning! This is usable for some things but doesn't do well for contours. Plan 1. go to velocity mode and add a tach. The tach is low output. only about 2.5 V/1000 rpm. For some reason I can't get the system stable. When enabled it oscillates for a few seconds and faults. That is with the analog input at zero (shorted). I've moved the tach gain all over the place with no luck so far. Plan 2. add the synthetic tach as per cradek. Plan 3. install a SEM servo motor with a known tach output. The X axis of this machine already has an SEM so I know it will work. :-) I'm open to ideas and opinions. Dave ------------------------------------------------------------------------------ Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Discover what all the cheering's about. Get your free trial download today. http://p.sf.net/sfu/quest-dev2dev2 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
