G59 Pnn
Reference the machine.
Move to where you want. with you laser, etc.
Manually using MDI will do to select an offset table.
Say 30 by G59 P30
You can also do this from the MDI screen by manually entering the offset number, and also the offsets screen.
Hit the X and Y zero.
Now the P30 table has that co-ord as X0 Y0.
In the start of your porgram put G59 P30.
Use different offsets for different jobs. You can store more than 240.
Make sure in the setup screen that Mach3 is setup to save the offsets when it exits.
Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.