Good morning All
I have a custom build 5axis foam sculpting machine and keep improving on machine.
Up to now I have been measuring tool length manually but its time to ad a auto tool length measure system.

I copied a a M6 macro and integrated the probe to my controller and Mach4....works perfect.....but, there is always a but.
to have the probe out of the way it sits below G54...-115mm to be exact. the math in mach4 or my macro seems to have  hard time with this negative value. I did a test and moved Probe in positive direction and then M6 works perfectly.
Can anybody shed some light on how to handle the negative value?
Gauge block Hight Maybe?

Thank you on advance
Kind regards
Marne