Siemens SINUMERIK 840Di sl Programming Manual page 371

Selecting the approach and retraction direction
Use the tool radius compensation (G140, basic setting) to determine the approach and
retraction direction with positive tool radius:
• G41 active → approach from left
• G42 active → approach from right
G141, G142 and G143 provide further approach options.
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
8.11 Smooth approach and retraction
Tool offsets
371