Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 678)

Skip, Gauge, and Probing Cycles
Chapter 27
27-4
Skip Function Application Examples
One typical application for these G-codes would be moving the part until it
contacts a probe and then proceeding with a machining operation from that
point. This would provide part feature consistency by insuring that the
machining of all parts began from a fixed reference point (probe trigger
point).
Note that for this application, the probe tip radius would not be significant,
and should be entered as zero if the skip signal position paramacros are to
be used.
Another typical application for these G-codes would be to mount the
probe as if it were a tool. When the probe contacts the part and triggers,
coordinate data would be available in the paramacros for use in the
remainder of the part program.
Note the probe tip radius is significant for this application.
Tool gauging functions are similar to external skip functions. The key
difference is that the tool gauging cycles use the actual tool position (when
the external skip signal is received) to enter values in the tool offset table
for the currently active offset.
Use tool gauging functions to terminate the execution of motion commands
in a block and modify offset tables when the control receives a signal
through PAL. When the program block is terminated any remaining axis
motion generated by the block that has not been performed remains
unexecuted (other non-motion commands are still performed). The current
tool position is stored, and the control continues program execution at the
beginning of the next block following the skipped block.
The gauging function is controlled by G37, G37.1, G37.2, G37.3, and
G37.4. The system installer determines what signal (such as a touch probe,
manual switch, etc.) corresponds to each G37 code in PAL. The system
installer can choose different signals to correspond to G37, G37.1 G37.2,
G37.3, and G37.4. G37 and G37.1 are functionally the same, always
using the same external signal and the same AMP defined feedrate.
27.3
Tool Gauging External Skip
Functions (G37 codes)