On Sunday, April 21, 2019, 5:47:22 PM MDT, Gene Heskett <[email protected]> wrote: On Sunday 21 April 2019 14:51:31 Bruce Layne wrote:
> I don't need to use an impact wrench to tighten and loosen the drawbar > to prevent TTS tooling from pulling out. Something isn't right there, > Gene. Maybe some of the grease you're using on the drawbar threads > made its way into the 3/4" interior of the modified R8 collet? Possible, but whats this about a "modified R8 collet"? [snip] Tormach sells a special 3/4" R8 collet with the nose ground flat so it doesn't protrude past the spindle nose opening. That's to ensure the shoulder of the TTS holder bears solidly against the spindle nose. If you're using a standard 3/4" R8 collet I suspect that's the cause of the slipping problem. The rounded nose of the collet may be bottoming in the recess on top of the shoulder. If it's not preventing the shoulder rim from touching the spindle nose, it may be preventing it from making hard enough contact. A 4C 3/4" collet has a small enough OD and small enough protrusion that it doesn't need to be ground flat on the nose to work properly with TTS holders. 'Course the only vertical mill that uses a 4C is the vertical head on a Hardinge UM or TM. _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
