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. Try Y[#<Y> * -1.0]
Just went and ran the original first listed by Vixen program on my Mach3 machine. Previously it cut a half moon shape but this time I reversed the a axis direction in the motor setup config as there wasn't room to switch the rotary table to the right hand side as the stepper motor fouled the column and now we have a perfect crank pin to size !! My machine I set to rollover to 0 and it doesn't rewind , just a z retract and then z to the new cut depth!Mark