Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 432)

Axis Motion
Chapter 12
12-60
The feedrate for a rotary axis is determined in much the same way as for a
linear axis.
When programming in G94 feed per minute mode, the rotary axis rotates
the programmed number of degrees at the programmed feedrate. Rotary
feedrate units are in degrees per minute.
When programming in G95 feed per revolution mode, the rotary axis
rotates the programmed number of degrees at the programmed feedrate.
Rotary feedrate units are in degrees per revolution of the spindle.
When G01, G02, or G03 are active, the control uses the programmed
feedrate to calculate the angular velocity of the rotary axis. This feedrate
is still limited to the maximum grinding feedrate (feedrate clamp) as
determined in AMP.
If you program a rotary axis move in a block with other axis feedrate
moves, all axes move simultaneously at independent feedrates so that the
rate along the effective path is equal to the programmed feedrate (see
Figure 12.26). All axes must start and stop at the same time, so the control
may reduce the feedrate along the effective path to avoid exceeding the
maximum rotary axis feedrate
When the control is in rapid mode (G00), the feedrate for the rotary axis is
the rapid feedrate for that axis as defined in AMP by your system installer.
If other axes are moving in the same block, the control drives one of the
axes at its rapid feedrate and reduces the feedrate of the others as required
to insure that all axes start and stop at the same time (see page 12-57 for
details).
ATTENTION: Remember when programming a rotary axis
that the programmed feedrate is in units of angular velocity.
This means that the actual feedrate depends on the distance
from the center of rotation of the rotary axis.
12.7.7
Rotary Axis Feedrates