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Behavior with M92—Additional machine datum
In addition to the machine datum, the machine tool builder
can also define an additional machine-based position as a
reference point.
For each axis, the machine tool builder defines the
distance between the machine datum and this additional
machine datum. Refer to the machine manual for more
information.
If you want the coordinates in a positioning block to be based on the
additional machine datum, end the block with M92.
Radius compensation remains the same in blocks that are
programmed with M91 or M92. The tool length, however,
is not compensated.
Effect
M91 and M92 are effective only in the blocks in which they are
programmed.
M91 and M92 take effect at the start of block.
Workpiece datum
If you want the coordinates to always be referenced to the machine
datum, you can inhibit datum setting for one or more axes.
If datum setting is inhibited for all axes, the TNC no longer displays the
SET DATUM soft key in the Manual Operation mode.
The figure shows coordinate systems with the machine datum and
workpiece datum.
M91/M92 in the Test Run mode
In order to be able to graphically simulate M91/M92 movements, you
need to activate working space monitoring and display the workpiece
blank referenced to the set datum (see "Showing the Workpiece in the
Working Space", page 556).
HEIDENHAIN iTNC 530
305
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