[jdandersonjr]

We have a Niigata HN80 horizontal CNC mill with a Fanuc MB controller. Spindle orient sensor is mounted to spindle, magnetic type and gear box is 2 speed.
Problem is when orienting in high gear, spindle hunts back and forth until finally settling in and stopping. Sometimes it does not stop, which causes a fault when using optical transmit probe. The cause is because of backlash in the gear box. It works fine in low gear. Is there a way to set control to perform spindle orient (M19) only in low gear?

[sld4121]

Nothing that I can find in the parameters, so I would modify the tool change macro to change to low gear before the orient.
Of course that means the M6 Txx would need to be on a line by itself.
Not sure if it is possible to modify the ladder to force a low range, but you can run that past your local guru.