Andre' Blanchard wrote: > What is the delay (in degrees of rotation) between reading the spindle > encoder and positioning the Z axis? > That delay would be in opposite directions going and coming out. Unless there is mechanical backlash between the spindle itself and the spindle encoder, this delay should be minute, somewhere in the couple millisecond range. At a couple hundred spindle RPM, it should be negligable.
Backlash in the Z axis, combining all factors such as axis following error, leadscrew backlash, spindle axial backlash and spring in the link between ballscrew and quill are most likely the culprit. This might be a lot easier to measure than the actual error during a threading cycle. It would be a VERY interesting experiment to perform, though, and could possibly turn up some kind of quirk in EMC2, such as a software delay introduced in the Z axis motion as it follows the spindle. I seem to recall there is some "smoothing" applied to the Z motion. Jon ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
