hy machinehop
that is a good idea, to help him run the trials faster ... but i'm afraid that there is always needed something in the chuck, regardless of od/id clmaping status, because there are safeties, that involve proximity senzors and pressure senzors
in order to run " hollow ", is needed to use the " grasp interlock cancel " spec, but this special function is costly, and was not designed for testing programs
the simpler way arround is to lock the machine, by pressing [ I-L ] + another button, like shown in attached, in order to put the machine in simulation mode; like this, real machine won't move, but display will work, even if there is nothing inside the chuck : this helps, for example, to test a future program, even if current machine setup is running a different program; sorry for all these explanations, i mostly wrote them for okuma1984 / kindly