Bill,
Yes there is a lot to sort thru. Take a look at replies 125,127,145,193,204 and get the swap axis macro's M940 and M950 that he posted.
I like the idea of doing it via the swap axis board. Haven't tried it all out, eventualy ...... I currently have two configs, one for indexing and another for rotary and use a stepper with gear reduction to temporarily drive the lathe spindle. Stepper use leaves something to be desired since as the motor rpm goes up torque decreases and the rpm is not linear and feedrate becomes limited and feedrate is also not linear. So need to get a servo and drive for the spindle, but that requires mods to my controller and wiring etc , etc......never ends...........
Also try out Phil's screen for the lathe ( you will see why as it is set up for A axis and other things) and also do a search for drilling macro's for the lathe.
RICH