HEIDENHAIN TNC 426, User Manual

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HEIDENHAIN TNC 426, TNC 430 321
8.8
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DATUM SHIFT with datum tables (Cycle 7)
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
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
found in the Q parameter.
Cancellation
n
Call a datum shift to the coordinates
X=0; Y=0 etc. from a datum table
n
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
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 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.
Datums from a datum table can be referenced either to
the current datum or to the machine datum (depending on
machine parameter 7475).
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.