HEIDENHAIN TNC 310 (286 140) - Manual (Page 150)

8 Programming: Cycles 138
DATUM SHIFT (Cycle 7)
A datum shift allows machining operations to be repeated at various
locations on the workpiece.
Function
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.
ú 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.
ú REF: Press the REF soft key (2nd soft-key row) 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.
Status Displays
If datums are referenced to the machine datum, then
■ The actual position values are referenced to the active (shifted)
datum.
■ The datum shown in the additional status display is referenced to
the machine datum, whereby the TNC accounts for the manually
set datum.
DATUM SHIFT with datum tables (Cycle 7)
Datums from a datum table can be referenced either to
the current datum or to the machine datum (depending
on machine parameter 7475).
The datum points from datum tables are only effective
with absolute coordinate values.
Remember that the datum numbers shift whenever you
insert lines in an existing datum table (edit part program
if necessary).
8.6 Cy
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