Siemens SINUMERIK 840D sl Programming Manual page 259

Programming the tool orientation with LEAD= and TILT=
The resultant tool orientation is determined from:
• Path tangent
• Surface normal vector
• Lead angle LEAD
• Tilt angle TILT at the end of the block
Behavior at inside corners (for 3D-tool compensation)
If the block is shortened at an inside corner, the resulting tool orientation is also achieved at
the end of the block.
Definition of tool orientation with LEAD= and TILT=
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
at the start of the block A4, B4, C4 and at the end of the block A5, B6, C5
in the plane defined by the path tangent and surface normal vector
vertical to the path tangent and relative to the surface normal vector
7.2 Three, four and five axis transformation (TRAORI)
Transformations
7-21