Siemens Sinumerik 840D Operating Turning page 85

Tool changing point
In order to approach a tool changing point that is independent of the length
of the tool and the presently active zero point offset, the following condi-
tions must be programmed:
Switching OFF of all the active offsets
or manipulations of the coordinate system
Deactivation of the tool lengths in X and Z
Programming example 2:
N10 G18 G54 ...
N20 G00 X400 Z500 SUPA D0
N30 T1; Roughing tool
N40 D1
...
M
Since by using the code SUPA any manipulations of the coordinate system
have been deactivated only for the programmed block, they do not need to
be reactivated.
But care must be taken, because after each tool change the required cut-
ting edge must be called up.
Hint:
The extent of programming for the approach of the tool changing point can
be reduced if for this purpose a subprogram is written (see Section 5 in this
module).
840D/828D SINUMERIK Operate
Explanation:
Approach of tool changing point in the
MCS, without tool data
Indexing the turret to position T1
Call-up of the tool data for T1
W
Pos. Z
Page 7
Code SUPA
(operative block-by-
block))
Code D0
(modally operative)
Section 5
Notes
B505
B505