HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 381)

HEIDENHAIN iTNC 530 381
8.1
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DATUM SHIFT with datum tables (Cycle G53)
Function
Datum tables are used for
n frequently recurring machining sequences at various locations on
the workpiece
n frequent use of the same datum shift
Within a program, you can either program datum points directly in the
cycle definition or call them from a datum table.
U U U U Shift: Table row? P01: Enter the number of the
datum from the datum table or a Q parameter. If you
enter a Q parameter, the TNC activates the datum
number found in the Q parameter.
Cancellation
n
Call a datum shift to the coordinates X=0; Y=0 etc. from the datum
table.
n
Execute a datum shift to the coordinates X=0; Y=0 etc. directly with
a cycle definition.
Example: NC blocks
N72 G53 P01 12 *
N
0
N
2
N
4
N 1
N
3
N
5
Z
X
Y
Z
X
Y
X
Y
X
Y
N 0
N 2
N 1
1
2
1
2
Datums from a datum table are always and exclusively
referenced to the current datum (preset).
MP7475, which earlier defined whether datums are
referenced to the machine datum or the workpiece datum,
now serves only as a safety measure. If MP7475 = 1, the
TNC outputs an error message if a datum shift is called
from a datum table.
Datum tables from the TNC 4xx whose coordinates are
referenced to the machine datum (MP7475 = 1) cannot be
used in the iTNC 530.
If you are using datum shifts with datum tables, then use
the Select Table function to activate the desired datum
table from the NC program.
If you work without the Select Table block %:TAB:, you
must activate the desired datum table before the test run
or the program run (This applies also for the programming
graphics.):
n Use the file management to select the desired table
for a test run in the Test Run operating mode: The
table receives the status S.
n Use the file management in a program run mode to
select the desired table for a program run: The table
receives the status M.
The coordinate values from datum tables are only effective
with absolute coordinate values.
New lines can only be inserted at the end of the table.