Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 673)

Skip and Gauge Probing Cycles
Chapter 27
27-5
Important: The move that immediately follows a G37 series skip block
cannot be a circular move.
The system installer determines in AMP if the new value is added to or
replaces the old value in the table. The system installer also determines in
AMP what gauge cycles alter which tool offset tables, geometry, or wear.
The control automatically compensates for probe radius and length when
calculating tool offset changes if these probe parameters have been
entered.
The coordinates of the axes when the external skip signal is received are
available as the paramacro system parameters #5061--#5066 (work
coordinate system) and #5071--#5076 (machine coordinate system). These
values will have been adjusted to compensate for the probe tip radius and
the probe length if radius and length compensation values were entered.
For example, assume you have entered a probe tip radius of .01. It is
triggered as axis 2 approaches in the positive direction at the axis 2
coordinate of 1.1200. The value available for paramacro parameter #5072
would be 1.1300
Probe tip radius and probe length are defined by the system installer in
AMP. These values may also be changed through the paramacro system
parameters #5096 (for radius) and #5095 (for length).
See the paramacro chapter for details on paramacro parameters.
Tool Gauging Application Example
A typical application for these G-codes in determining tool length offsets
executes as follows:
1. When the control executes the G37 block, the tool is moved towards
the triggering device using the axis specified in the block.
2. When the control receives the appropriate skip signal through PAL,
axis motion stops.
3. The control records the position when the skip signal is received. It
determines the difference by subtracting the position specified with
the axis word in the G37 block from this position. The difference is
then added to or replaces the value in the appropriate geometry or
wear table for the currently active tool offset number.