Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 458)

Programming Feedrates
Chapter 18
18-10
Programming G25 Adaptive Feed
Program a G25 block as follows:
G25 Q__ F__ E__;
X__
Y__
Z__
Where: Programs:
X, Y, or Z Axis endpoint. Program the endpoint of the axis that is to be
positioned using the adaptive feed feature. This endpoint can be
programmed as either an absolute or incremental value (G90 or G91
mode). You can only program one axis in an adaptive feed block.
You can not program axes that are positioned by more than one servo
(dual or deskew axes).
Q Desired Torque percentage. Enter an integer percentage of the
selected servo’s continuous rated torque as entered in AMP by your
system installer. Valid ranges are from 1% to 150% of the servo’s
rated torque. Refer to your system installer’s documentation for
details on the rated torque of the servos in your system.
Important: The torque amount applied by the servo is not the cutting
force. It is the torque applied by the servo to the axis. You must
calculate the equivalent cutting force based on your machine
dynamics (motor rated torque, lead screw pitch, gearing, tool
dimensions, etc...).
F Maximum Feedrate. Enter the maximum feedrate that the axis is
allowed to reach during the adaptive feed move. This F--word is the
same as the modal feedrate and is used in following blocks. If you do
not program an F--word the control will use the previously active
feedrate. Program the F--word in either G93, G94, or G95 mode.
E Minimum Feedrate. Enter the minimum feedrate that the axis is
allowed to reach during the adaptive feed move. Program the E--word
in either G93, G94, or G95 mode.
You must program the G25 block in G01 mode. Programming G25 in
other cutting modes (such as G00, G02, or G03) will generate an error.
The G25 command is not modal and must be programmed in all blocks
that are to use the adaptive feed feature.
When the adaptive feed move starts, the control issues a command that
moves the axis with the desired torque percentage Q. The system installer
determines in AMP if ACC/DEC is used for the start and stop of an
adaptive feed move. If ACC/DEC is used the control will attempt to ramp
the velocity command to minimize the initial start up and decel shock.