Smooth Approach And Retraction; Function; Parameters - Siemens SINUMERIK 840D sl Function Manual

2.5.4

Smooth approach and retraction

2.5.4.1

Function

Description
The SAR (Smooth Approach and Retraction) function is used to achieve a tangential approach
to the start point of a contour, regardless of the position of the start point.
The approach behavior can be varied and adapted to special needs using a range of additional

parameters.

The two functions, smooth approach and smooth retraction, are largely symmetrical. The
following section is, therefore, restricted to a detailed description of approach; special
reference is made to differences affecting retraction.
Sub-movements
There are maximum 4 sub-movements in case of soft retraction and approach with the
following positions:
● Start point of the movement P
● Intermediate points P
● End point P
Points P
to the parameters defined and the geometrical conditions.
On retraction, the points are traversed in the reverse direction, i.e. starting at P
P .
0
2.5.4.2 Parameters
The response of the smooth approach and retraction function is determined by up to 9
parameters:
Non-modal G command for defining the approach and retraction contour
This G command cannot be omitted.
● G147: Approach with a straight line
● G148: Retraction with a straight line
● G247: Approach with a quadrant
● G248: Retraction with a quadrant
Tools
Function Manual, 06/2019, A5E47435126B AA
, P and P
1 2
4
P and P are always defined. Intermediate points P
0, 3 4
0
3
W1: Tool offset
2.5 2D tool radius compensation
and P can be omitted, according
1 2
and ending at
4
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