Smooth Approach And Retraction; Approach And Retraction (G140 To G143, G147, G148, G247, G248, G347, G348, G340, G341) - Siemens SINUMERIK 840DE Programming Manual

Tool offsets

8.11 Smooth approach and retraction

At intermediate point P*, the control executes instructions such as infeed movements or
switching functions. These instructions are programmed in blocks inserted between the two
blocks forming the corner.
Note
Superfluous non-cutting tool paths can result from liftoff movements at acute contour angles.
A parameter can be used in the machine data to define automatic switchover to transition
circle in such cases.
8.11 Smooth approach and retraction
8.11.1 Approach and retraction (G140 to G143, G147, G148, G247, G248, G347, G348,
G340, G341)
Function
The soft approach and retraction function (SAR) is used to achieve a tangential approach to
the start point of a contour, regardless of the position of the start point.
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Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals