I have a postprocessor for Mach that pretty well makes it automatic - it does essentially the same the same thing for the rotary axis without as much fuss. It also swaps the Y and A axis in the g-code so you don't have to switch cables in a four-axis rig to do rotary cuts from a file "faked" this way. If anyone is interested let me know and I will send it to you.
It has saved me TONS of time. |