Smooth Approach And Retraction; Function - Siemens SINUMERIK 828D Function Manual

W1: Tool offset
18.5 Tool radius compensation 2D (TRC)
Figure 18-15 Differences between KONTT and KONTC
Note
The figure shows that a straight line bordering on the contour quadrant, e.g. to X20 Y-20,
would be violated with KONTC on retraction/approach to X0, Y0.
18.5.4

Smooth approach and retraction

18.5.4.1

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.
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions