Siemens SINUMERIK 840D sl Programming Manual page 310

Tool radius compensation
10.4 Smooth approach and retraction
Significance
G460:
G461:
G462:
Note
The approach behavior is symmetrical to the retraction behavior.
The approach/retraction behavior is determined by the state of the G command in the
approach/retraction block. The approach behavior can therefore be set independently of the
retraction behavior.
Examples
Example 1: Retraction behavior with G460
The following example describes only the situation for deactivation of tool radius
compensation: The behavior for approach is exactly the same.
Program code
G42 D1 T1
...
G1 X110 Y0
N10 X0
N20 Y10
N30 G40 X50 Y50
Example 2: Approach with G461
Program code
N10 $TC_DP1[1,1]=120
N20 $TC_DP6[1,1]=10
N30 X0 Y0 F10000 T1 D1
N40 Y20
N50 G42 X50 Y5 G461
N60 Y0 F600
N70 X30
N80 X20 Y-5
N90 X0 Y0 G40
N100 M30
310
As previously (activation of the collision detection for the approach and retraction
block)
Insertion of a circle in the TRC block, if it is not possible to have an intersection
whose center point is in the end point of the uncorrected block, and whose radius
is the same as the tool radius.
Up to the intersection, machining is performed with an auxiliary circle around the
contour end point (i.e. up to the end of the contour).
Insertion of a circle in the TRC block, if it is not possible to have an intersection;
the block is extended by its end tangent (default setting).
Machining is performed up to the extension of the last contour element (i.e. until
shortly before the end of the contour).
Comment
; Tool radius 20 mm
Comment
; Milling tool type
; Tool radius
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals