Siemens SINUMERIK 808D User Manual page 140

G248 ; Retraction with a quadrant
G347 ; Approach with a semi-circle
G348 ; Retraction with a semi-circle
G340 ; Approach and retraction in space (basic setting)
G341 ; Approach and retraction in the plane
DISR=... ; Approach and retraction with straight lines (G147/G148): Distance of the cutter edge from the start
or end point of the contour
; Approach and retraction along circles (G247, G347/G248, G348): Radius of the tool center point
path
DISCL=... ; Distance of the end point for the fast infeed motion from the machining plane (safety clearance)
FAD=... ; Speed of the slow infeed motion
The programmed value acts according to the active command of the G group 15 (feed: G94, G95)
See the following illustration for approaching along a straight line using the example of G42 or retraction using G41 and
completion with G40:
Programming example: Approach/retraction along a straight line in a plane
N10 T1 G17
N20 G0 X20 Y20
N30 G42 G147 DISR=8 F600 X4 Y4
N40 G1 X40
N50 Y12
N100 G41 G1 X15 Y15
N110 X4 Y4
N120 G40 G148 DISR=8 F700 X8 Y8
M30
140
; Activate tool, X/Y plane
; Approach P0
; Approach, point P4 programmed
; Continue in the contour
; P4 - contour end point
; Retraction, point P0 programmed
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA6, 09/2017