Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 83)

Offset Table and Setup
Chapter 3
3-9
The measure feature offers an easier method of establishing tool offsets.
The control, not the user, computes the tool length offsets and enters the
value into the tool offset table. Note the measure feature is used to
measure tool length offset values for the wear or geometry tables. It is
typically not very effective at measuring tool diameters unless special
attention is paid to tool orientation. To use the measure feature, follow
these steps:
1. Establish a fixed machine position without a tool in the chuck. This
position may be any fixed, non-movable location on the machine that
the tool may be jogged against consistently, using a variety of
different tools.
If entering a tool length in the geometry offset table, jog the
machine gauge line (on the axis being updated) to this position.
No tool offsets should be active and no tool should be in the chuck.
The value of this position, located in the work coordinate system,
must be recorded. The user keys in this value in steps 6 and 7.
If entering a tool length wear in the wear offset table, jog the
machine gauge line to the fixed position. No tool offsets should
be active, and no tool should be in the chuck. The value of this
position, located in the work coordinate system, must be recorded.
Add the original tool length offset from the tool geometry table to
the fixed machine location. The user keys in this value in step 7.
2. Access the tool geometry or wear offset table as discussed in section
3.1.2.
3. Cursor down to the offset that is to be changed. Note that the offset
can be displayed in either inch or metric measurements.
4. Load the tool that is to be measured into the chuck.
5. Using incremental, continuous or handwheel mode, jog the tool tip to
the fixed location determined in step 1.
6. Press the {MEASURE} softkey.
7. Key in the coordinate value of the fixed location determined in
step 1.
8. Press the [TRANSMIT] key.
The control now subtracts the keyed in position from the current axis
position and enters this difference as the offset value into the table.
3.1.3
Setting Offset Data Using
{MEASURE}