"PrecisionmachinisT" wrote in message news:V_SdnVosXsd4lxXMnZ2dnUVZ_gSdnZ2d@scnresearch. com...

Fadal for instance...

I forgot a step--first the spindle is run down against a solid object till the Z servo amp trips, then it is raised back up and an indicator is set...ThEN the drawbar is unclamped and the new reading noted.