Smooth Approach And Retraction; Approach And Retraction (G140 To G143, G147, G148, G247, G248, G347, G348, G340, G341, Disr, Discl, Disrp, Fad, Pm, Pr) - Siemens SINUMERIK 840D sl Programming Manual

When G451 is activated and with acute contour angles, superfluous non-cutting tool paths can
result from lift-off movements. A parameter can be used in the machine data to define automatic
switchover to transition circle in such cases.
2.10.4

Smooth approach and retraction

2.10.4.1 Approach and retraction (G140 to G143, G147, G148, G247, G248, G347, G348, G340,
G341, DISR, DISCL, DISRP, FAD, PM, PR)
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.
This function is used preferably in conjunction with the tool radius compensation.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Fundamentals
2.10 Tool radius compensation
271