I should have researched a little more. I figured out how to edit the _inc post processor and add the G43. Works great now.
Is there a way to edit the post processor files? I used to use the mach3_peck or mach_4 rotary files until I started having problems with arcs. I then switched to a mach3_inc post processor but that one doesn't seem to apply the mach 3 tool table offsets.
mach3_inc only creates a line like this for the tool change:
N 60 M06 T03
whereas the mach3_rotary post processor creates the following lines:
N7T3M06 ( 1/4" 3-Flute Radius End Mill )
N8G00G43Z0.1H3
And if I understand correctly, the 2nd line is what is important in order to tell mach3 to use the offsets. There are no G43 commands in the _inc processor.
I should have researched a little more. I figured out how to edit the _inc post processor and add the G43. Works great now.