Hi All

If you are tramming a conventional milling machine one quite useful tool to assist in tramming a spindle is an old brake disk, car service centers usually have a skip full of them, you should be able to get one for free or almost free.

The disk is simply placed on the table center, its surface allows you to swing the dial indicator smoothly around the face of the disk without the risk of damaging the indicator tip on the table T slots if used directly.

Some disks have a deep boss while others are quite shallow. You will need a lathe big enough to face the old disk flat and parallel.

Regards
John