[jdebott1]

Okay, I've read over numerous posts on the forum, plus much more information about G02 and G03 arcs. And, after trying to run some tests with both, I'm now thoroughly confused.

I need a simple example of cutting a table leg pommel transition (very simple by hand on the lathe) that I can learn from. I'm attaching a simple drawing of this.

I am transitioning from 1 1/2 in x 1 1/2 in (38.10 x 38.10 mm) square stock to 1 1/4 in. (31.75 mm) round. From the Diagonal of the square stock, the transition will go from a radius of 26.9875 mm to 15.875 mm radius over a distance of just 12.70 mm. My CNC shopnotes works on the XZ plane, and here is the code I am trying:


N100 G00 X0.0 Z26.9875 (start point at beginning of square stock diagonal radius)
N120 G18 G03 X12.70 Z19.05 I12.70 K-7.9375
M30


I am getting a zero radius arc error. What I am missing?

Thanks for your kind assistance.

Joe D.