I've had trouble with using these two setting crashing my z++ limit switch and wonder if any one else had experimented with these options and encountered trouble also..
setting the safe z height to 2.00" machine coordinates, using 2.500" as z home and setting in mach3 tool change location to X4, Y1 and Z2..
the z limit switch crash happen during a M6 programmed tool change, cant remember if it's before the M6 or exiting M6 and returning to part starting point.
my z limit crash is the z axis goes on pass the limit and crashes the switch when trying to return to a z axis position below the 2.500 machine coordinate default.
any one else played with these settings, may first testing looks as if tool change location is absolute for X & Y and relative for Z, just curious..