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Hi, sorry, yes I am using Mach3 post processor.

 

I understand the G28 G91 Z0 is a move to home command ..

This tells the machine to go to Z0 1st, then proceed move to X0,Y0,A0 ..

I have found this code 8 times throughout the full program .. One for the beginning of each rotation movement ..

 

But why is it in the program, when the home position for my Rotary is 22mm below the surface of the material ?

How do I set a Z0 position to the top surface of the material, instead of the center of the rotational axis ?