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

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Figure 18-15 Differences between KONTT and KONTC

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.

Smooth approach and retraction

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

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.

Basic Functions

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

18.5 Tool radius compensation 2D (TRC)

W1: Tool offset

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