Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 404)

Axis Motion
Chapter 14
14-28
When programming an arc using I, J, or K words the control does not use
these values as polar coordinates. Program the center of the arc in the
same manner as normal circular programming described in section 14.1.3 .
I, J, and K are always cartesian coordinate values.
Example 14.12
Circular Polar Programming
G00X0.Y0.;
G91G16F100;
G02X20.Y20.I9.397J3.42;
G15;
M30;
Figure 14.16
Results of Circular Polar Programming Example
Polar defined vector
Actual tool path
taken
(18.790, 6.840)
20
•
X
Y
20
15
10
25 20 15 5
9.397
3.420