Siemens SINUMERIK 840D sl Function Manual page 730

Punching and Nibbling (N4)
10.4 Automatic path segmentation
Figure 10-4
X2/Y2:
SPP:
SPP':
Example of SPN
The number of path segments per block is programmed via SPN.
A value programmed via SPN takes effect on a non-modal basis for both punching and
nibbling applications. The only difference between the two modes is with respect to the first
stroke. This is normally executed at the beginning of the first segment with nibbling
operations and at its end with punching operations. This means that when n segments are
programmed, n strokes are executed with punching operations but n+1 with nibbling.
Furthermore, where no travel information is available, only a single stroke is executed, even
if several are programmed. Should it be necessary to generate several strokes at one
position, then the corresponding number of blocks without traversing information must be
programmed.
N1 G01 X0 Y0 SPOF
N2 X75 SPN=3 SON
:
:
:
:
N3 Y10 SPOF
730
Path segmentation
Programmed traversing distance
Programmed SPP value
Automatically rounded-off offset distance
; Position without punch initiation
; Activate nibbling. The total path is divided into 3
; segments. A stroke is initiated before the first
; movement and at the end of each segment.
; Position without punch initiation
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions