HEIDENHAIN TNC 410 ISO Programming - Manual (Page 321)

HEIDENHAIN TNC 410, TNC 426, TNC 430 295
8.9 Coo
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DATUM SHIFT (Cycle G54)
A DATUM SHIFT allows machining operations to be repeated at
various locations on the workpiece.
Effect
When the DATUM SHIFT cycle is defined, all coordinate data is based
on the new datum. The TNC displays the datum shift in each axis in
the additional status display. Input of rotary axes is also permitted.
U U U U Datum shift: Enter the coordinates of the new
datum. Absolute values are referenced to the
manually set workpiece datum. Incremental values
are always referenced to the datum which was last
valid—this can be a datum which has already been
shifted.
Additionally with TNC 410:
U U U U REF : Press the REF soft key to reference the
programmed datum to the machine datum. In this
case the TNC indicates the first cycle block with REF
Cancellation
A datum shift is canceled by entering the datum shift coordinates X=0,
Y=0 and Z=0.
Graphics (not TNC 410)
If you program a new workpiece blank after a datum shift, you can use
Machine Parameter 7310 to determine whether the blank is
referenced to the current datum or to the original datum. Referencing
a new BLK FORM to the current datum enables you to display each
part in a program in which several pallets are machined.
Status displays
n The actual position values are referenced to the active (shifted)
datum.
n All of the position values shown in the additional status display are
referenced to the manually set datum.
Example: NC blocks
N72 G54 G90 X+25 Y-12.5 Z+100 *
...
N78 G54 G90 REF X+25 Y-12.5 Z+100 *
Z
Z
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Y
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