Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 371)

Chapter 11
Coordinate Control
11-55
In circular mode, the scale factors for the axes of the active plane have
to be the same. The control generates an error if the scale factors of the
axes are not equal
Scaling is applied to the following fixed cycles as shown below. The
axis letters can vary depending on how AMP is configured.
G31, G31.1 - G31.4
Gxx X__Z__
X (scaled)
Z (scaled)
G37, G37.1 - G37.4
Gxx Z__
Z (scaled)
G80, G81, G81.1, G82, G82.1, G83, G83.1, G84, G84.1,
G85, G85.1, G86, G86.1, G87, G87.1, G88, G88.1
Gxx X__ I__Z__K__R__Y__J__Q__L__F__E__P__D__
X (scaled)
I
(scaled)
Z (scaled)
K (scaled)
R (scaled)
Y (scaled)
J (scaled)
Q (scaled)
L (not scaled)
F (not scaled)
E (not scaled)
P (not scaled)
D (not scaled)
Important: R uses the scale factor associated with the axis that is
perpendicular to the active plane