Hey guys the Auto tool set button in Mach is just that. I have my machine set up with a permanent switch under the z axis while the machine is homed. My sequence starts like this. I reference the machine when I power up, hit the go to zero's and then place what bit I need for the job in the collet, hit auto tool set and the z axis will lower till the switch is tripped then move 2" above the switch which gives me a know distance above either my table or my 4th axis centerline. Now the newer versions of mach may require tweaking for your own needs but it can be done quite easily.
Mike
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