HEIDENHAIN iTNC 530 (340 49x-01) - Manual (Page 428)

428 8 Programming: Cycles
8.9
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DATUM SHIFT with datum tables (Cycle 7)
Function
Datum tables are used for
„ frequently recurring machining sequences at various locations on
the workpiece
„ 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.
8 Datum shift: 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
entered in the Q parameter.
Cancellation
„ Call a datum shift to the coordinates
X=0; Y=0 etc. from the datum table.
„ Execute a datum shift to the coordinates X=0, Y=0 etc. directly with
a cycle definition.
Example: NC blocks
77 CYCL DEF 7.0 DATUM SHIFT
78 CYCL DEF 7.1 #5
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 SEL TABLE function to activate the desired datum table
from the NC program.
If you work without SEL TABLE, then you must activate the
desired datum table before the test run or the program
run. (This applies also to the programming graphics).
„ 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.
„ 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.