Kirk Wallace wrote: >> Feed per revolution is based on spindle *velocity* feedback. > > Why should feed per revolution be different than threading or > electronically geared?
Threading uses spindle position feedback, because threads have to be exactly repeatable from pass to pass, and the pitch must be exactly right. Feed per rev doesn't need that exact pass-to-pass repeatability, nor does it matter if the actual feed is 0.00403 per rev when you ask for 0.004 per rev. That means that feed-per-rev can use velocity instead of position, and it can use commanded velocity instead of feedback velocity. So lathes that don't even have a spindle encoder can still do feed per rev, even though they can't do threading. Regards, John Kasunich ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
