Brian Michalk wrote: > Is there an old trick to turning a part exactly on center? > If this venue is not the right place, I would appreciate a pointer to an > active group that could help me. > > I have 12mm precision round shafting. I need to turn down one end of it > to .25 inches diameter. > I have a four jaw chuck, and center to within .001", but when I hard > couple a stepper motor to this part, it binds due to the .25" boss not > being exactly on center. > I do have a spider coupling, but would rather go direct due to the added > size of the coupling. > > Is there some "trick" someone could enlighten me with?
After you turn the diameter recheck the concentricity by indicating both diameters as it is turning at a slow RPM. Another problem might be the part is not chucked parallel to the spindle axis. To check that, chuck your piece with at least 1" sticking out from the chuck, now adjust to center with the indicator point near the chuck and then check it near the end, if you have any difference then the axis of your part is not parallel or concentric with the center line of the spindle. In the end the best is to find room for a flexible coupling. Ed. ------------------------------------------------------------------------- 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
