Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 390)

Axis Motion
Chapter 12
12-18
The angle word (A) cannot be programmed in a circular block
The absolute coordinate values for both axes in the current plane must
be programmed in the second block. Both must be programmed
regardless of whether there is axis motion or not
Linear-to-Circular Blocks
When the coordinates of the intersection of a linear path into a circular
path are not known, use the following format. A G13 or G13.1 must be
programmed and absolute coordinate values must be used.
Format:
G13G01 A__; or G13G01 A__;
G02 Z__X__K__I__; G02 Z__X__R__;
Important: If the second block is an arc and it is programmed using I and
K integrands, the values programmed with I and K are not measured from
the start point of the arc as normally done. This is because the start point
of the arc is normally unknown when using this format. When using this
format the integrands specify the distance from the end point of the arc to
the center point.
Example 12.10
Line Into Arc Without Programming Intersection
G00Z25.X0.;
G01G13.1A90;
G03Z7.X15.K9.21I-2.;