12
08.97 Punching and Nibbling
12.2 Automatic
ath se
mentation
12
840 D
NCU 572
NCU 573
840Di
ï›™
Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
12-421
12.2.1 Path segmentation for path axes
Sequence
Length of SPP path segment
With the SPP command, you specify the maximum
distance between strokes and thus the maximum
length of the path segments into which the total
traversing distance is to be divided.
The command is deactivated with SPOF or SPP=0.
Example:
N10 G1 SON X0 Y0
N20
SPP=2
X10
In this example, the total traversing distance of 10
mm is divided into 5 path segments of 2 mm
(SPP=2) each.
The path segments effected by SPP are always
equidistant, i.e. all segments are equal in length.
In other words, the programmed path segment size
(SPP setting) is valid only if the quotient of the total
traversing distance and the SPP value is an integer.
If this is not the case, the size of the path segment is
reduced internally such as to produce an integer
quotient.
Example:
N10 G1 G91 SON X10 Y10
N20 SPP=3.5 X15 Y15
X2/Y2 Programmed path (nibbling or punching block)
E1 Programmed path segment
E1' Automatically rounded path segment length
X2
X
E1
E1
Y2
Y
When the total traversing distance is 15 mm and the
path segment length 3.5 mm, the quotient is not an
integer value (4.28).
In this case, the SPP value is reduced down to the
next possible integer quotient. The result in this
example would be a path segment length of 3 mm.
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