Sorry Wes, it was my bad about the Z values. They are fine.
It looks like in diameter mode the K word should be half the radius. See the code I posted in reply #23. Here are the last few lines:
(Finish Passes)
G1 X15 F0.05
G3 X15 Z-25 K-5
G0 Z-15
(Spring Pass)
G1 X15 F0.05
G3 X15 Z-25 K-5
G0 X16.5
G0 Z0.5
M5
M30
When is diameter mode, the last G3 move takes the cutter to the extreme X5, while the X end is defined as 10. Sorry for being unable to explain it better. Hope you follow me. Just change between the modes and run the code. You will see where the DROs go. Also load the OD Arc3 wizard and see how the arc movements are affected by changing the mode. I didn't try to understand the math behind it, but for some reason, in diameter mode the 'I' word adds up. In radius mode it's zero.
Dan