Siemens SINUMERIK 808D User Manual page 141

See the following illustration for approaching along a quadrant using the example of G42 or retraction using G41 and
completion with G40:
Programming example: Approach/retraction along a quarter in a plane
N10 T1 D1 G17
N20 G0 X20 Y20
N30 G42 G247 DISR=20 F600 X4 Y4
N40 G1 X40
N50 Y12
N60 G41 G1 X15 Y15
N70 X4 Y4
N80 G40 G248 DISR=20 F700 X8 Y8
N90 M30
See the following illustration for approaching along a semi-circle using the example of G42 or retraction using G41 and
completion with G40:
N o te
Make sure that a positive radius is entered for the tool radius. Otherwise, the directions for G41, G42 will be changed.
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA6, 09/2017
; Activate tool, X/Y plane
; Approach P0
; Approach, point P4 programmed
; Continue in the contour
; P4 - contour end point
; Retraction, point P0 programmed
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