Approach And Retraction With Enhanced Retraction Strategies (G460, G461, G462) - Siemens SINUMERIK 840Di sl Programming Manual

Tool offsets
8.11 Smooth approach and retraction
8.11.2

Approach and retraction with enhanced retraction strategies (G460, G461, G462)

Function
In certain special geometrical situations, enhanced approach and retraction strategies,
compared with the previous implementation with activated collision monitoring for approach
and retraction block, are required in order to activate or deactivate tool radius compensation.
For instance, collision monitoring can lead to a section of the contour not being fully
machined. See following image.
Retraction behavior with G460
Programming
G460
Or
G461
or
G462
Parameters
G460
G461
G462
378
As before (activation of collision monitoring for approach and
retraction block)
Insertion of a circle in the TRC block, if no intersection point is
possible, whose center point is at the end point of the uncorrected
block and whose radius is equal to the tool radius.
Auxiliary circuit is used to machine around the contour end point (i.e.
up to the end of the countour) up to the intersection.
Insertion of a straight line in the TRC block if no intersection point is
possible; the block is extended by its end tangent (default setting)
Machining is done up to the extension of the last contour element (i.e.
up to just before the contour end).
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals