Neale - Thanks for reply. I am actually just beginning to use Planet CNC TNC. (Still have three other Mach3 M/c`s) Just to confuse myself. - Been experimenting with G30 and it is becoming clearer. Absolute XY position and Z sequence for clearance are set as normal and as you suggest this works conveniently for a fixed sensor plate. - But I still would like to understand the multiple G30 offsets. Going to "play" with it this morning by trying a G30.1, G30.2 etc.
I guess it might be used as zero offsets for multiple pieces on the table or multiple non uniform part positions on a single plane?
Just something I have not use before and as Planet CNC feature it, curiosity more than necessity has set in.