12-17-2012, 03:52 PM
Tom's suggestion is excellent, just what I would do. Measure the width of your parting off tool (exact), add it to the .300" thickness you need. Turn and bore the workpiece long enough to make several of the spacers. No mount a long-tavel indicator (assuming you don't have a DRO on the machine), and move over by that amount for each successive part.
If you can't do that, make them long and either follow dallen's suggestion or (better) bore out a soft emergency collet with a counterbore/stop surface and bring them to length as a secondary facing operation.
If you can't do that, make them long and either follow dallen's suggestion or (better) bore out a soft emergency collet with a counterbore/stop surface and bring them to length as a secondary facing operation.