HEIDENHAIN TNC 410 - Manual (Page 195)

8 Programming: Cycles 182
DATUM SHIFT (Cycle 7)
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.
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 to reference the
programmed datum to the machine datum. In this
case the TNC indicates the first cycle block with REF
Example NC blocks:
73 CYCL DEF 7.0 DATUM SHIFT
74 CYCL DEF 7.1 X+10
75 CYCL DEF 7.2 Y+10
76 CYCL DEF 7.3 Z-5
Cancellation
A datum shift is canceled by entering the datum shift coordinates
X=0, Y=0 and Z=0.
Status Displays
■ The actual position values are referenced to the active (shifted)
datum.
■ The actual position values shown in the additional status display
are referenced to 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).
8.8 Coor
dinat
e
T
ransf
or
mation Cy
cles
Z
Z
X
X
Y
Y
Z
X
Y
IX
IY
N
0
N
2
N 4
N
1
N
3
N
5
Z
X
Y