Siemens SINUMERIK 840D sl Programming Manual page 304

Tool radius compensation
10.4 Smooth approach and retraction
Distance of the point from the machining plane (DISCL) (see figure when selecting approach/
retraction contour)
If the position of point P
to the circle plane, the value must be programmed in the form DISCL=AC(...).
The following applies for DISCL=0:
• With G340: The whole of the approach motion now only consists of two blocks (P
P
• With G341: The whole approach contour consists of three blocks (P
combined). If P
from P
• The point defined by DISCL is monitored to ensure that it is located between P
i.e. the sign must be identical for the component perpendicular to the machining plane in
all motions that possess such a component.
• On detection of a direction reversal, a tolerance defined by the machine data
SAR_CLEARANCE_TOLERANCE is permitted.
Programming the end point P4 for approach or P0 for retraction
The end point is generally programmed with X... Y... Z...
• Programming during approach
-
-
Example:
Program code
$TC_DP1[1,1]=120
$TC_DP6[1,1]=7
N10 G90 G0 X0 Y0 Z30 D1 T1
N20 X10
N30 G41 G147 DISCL=3 DISR=13 Z=0 F1000
N40 G1 X40 Y-10
N50 G1 X50
...
304
is to be specified by an absolute reference on the axis perpendicular
2
are combined). The approach contour is formed by P
3
and P are on the same plane, only two blocks result (infeed movement
0 4
to P is omitted).
1 3
P in SAR block.
4
P is defined by means of the end point of the next traversing block.
4
More blocks can be inserted between an SAR block and the next traversing block
without moving the geometry axes.
to P .
1 4
2
Comment
; Milling tool T1/D1
; Tool with 7 mm radius
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
, P and
1 2
and P are
3
and P ,
1 3
Fundamentals