Re: [CAD_CAM_EDM_DRO] Going home

the most common way I've seen is home at (max) Z+
Z zero (machine coordinates) is the bare spindle face at the home position
all tool offsets will be negative from there
Z zero (work coordinates) is up to you :-)

if you do make more than one spindle you can either build them
to mount with the spindle face at the same height or use a fixed
surface on the mounting plate of the slide as the machine zero
hmm.. or select a seperate home switch for each spindle module....
or set the home switch 'trip arm' of each spindle to home them at the
same height....

by using a fixed point on the spindle itself for zero you can rough set
the tool offsets by measuring them in the machine with a sliding head square,
inverted height guage,depth mic, calipers etc. to about .002" with some
practice
also works for resetting tools in collet holders fairly well (+-.005 or so)

Brian