G0(G1)R__I__J__A__Z__ (F__) ;Move to Helix Start Point
G12(G13)A__Z__F__ ;Do Helix
G1 is the G-Code for XYZ Linear Interpolation (Feed);
G12 is the G-Code for Helical Interpolation in a Clockwise Direction (CW);
G13 is the G-Code for Helical Interpolation in a CounterClockwise Direction (CCW);
A__ is Polar Angular Motion defined in terms of the total number of degrees of
helical travel (for G12 & G13 only). This is an “unsigned” incremental value;
Z__ is the absolute depth of travel;
F__ is the Feedrate;
R__ is the Arc Radius; and
I__, J__ are the X & Y distances (respectively).