This puts it in a nutshell for me. Thank you. On Thu, 2007-08-09 at 21:59 -0500, Jeff Epler wrote: > When threading, the axis position is electronically geared to the > spindle position -- the index pulse is just used to place the start of > the move at the right spindle angle. > > Constant surface speed changes the *commanded* spindle speed depending > on tool tip location, so unless you are doing closed-loop spindle speed > control in HAL, you can do without a spindle encoder here. > > Feed per revolution is based on spindle *velocity* feedback.
Why should feed per revolution be different than threading or electronically geared? > Again, you > can actually get by without spindle feedback -- you could just hook up > the commanded spindle speed to the spindle-velocity-in pin (converted > from rpm to revs-per-sec, yuck). But if you have spindle velocity (or a > spindle position to convert to velocity with a ddt block) you are almost > certainly better off if you use it. > > Jeff ------------------------------------------------------------------------- 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
