Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 416)

Axis Motion
Chapter 14
14-40
The feed to hard stop feature is used to position the axis of a transfer line
station or the transfer bar of the station against a mechanical stop and hold
it against the stop. This mechanical stop physically halts axis travel. The
system installer determines the position of this hard stop based on
mechanical consideration of the machine and the process currently being
performed by the axis or transfer bar.
Program a feed to hard stop using a G24 code. Format for the G24 code is
as follows:
G24
X__
Y__
Z__ I__
J__
K__
F__;
Where: Programs:
X, Y, or Z Hard stop axis. Use the axis word associated with the axis to be hard
stopped. Program an endpoint for the axis that is past, but very close
to, the actual hard stop location. The axis word can be programmed
as either an absolute or incremental value (G90 or G91 mode).
I, J, or K Detection zone. Use the axis integrand associated with the axis to be
hard stopped. Program an incremental distance from the
programmed endpoint for the control to start looking for a hard stop.
The axis detection zone is an unsigned value.
F Optional in the G24 block. F defines the active feedrate for the G24
feed to hard stop. If not programmed the currently active feedrate
is used.
Example 14.1
Feed to Hard Stop
G90 G01 F20;
G24 Z.2 K.15;
Z Axis
Lead screw
Spindle
Motor
Program the axis word with a position just
past the location of the axis when it is against
the hard stop.
Hard Stop
Program the integrand word with an
incremental distance from the programmed
axis word to a location the control can expect
to find the hard stop.
X
Z
1 .8 .6 .4 .2
.8
.6
.4
.2
Endpoint Z Detection Zone K
14.7
Feed to Hard Stop (G24)