Siemens SINUMERIK 828D Programming Manual page 320

Tool radius compensation
10.4 Smooth approach and retraction
During retraction, the roles of the modally active feedrate from the previous block and the
programmed feedrate value in the SAR block are reversed, i.e. the actual retraction contour
is traversed with the old feedrate and a new speed programmed with the F word applies from
P up to P
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Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals