Siemens Sinumerik 840D sl Programming Manual page 341

Programming of directional vector
The components of the direction vector are programmed with A3, B3, C3. The vector points
towards the tool adapter; the length of the vector is of no significance.
Vector components that have not been programmed are set equal to zero.
Programming the tool orientation with LEAD= and TILT=
The resultant tool orientation is determined from:
• Path tangent
• Surface normal vector
at the start of the block A4, B4, C4 and at the end of the block A5, B6, C5
• Lead angle LEAD
in the plane defined by the path tangent and surface normal vector
• Tilt angle TILT at the end of the block
vertical to the path tangent and relative to the surface normal vector
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.
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
6.2 Three, four and five axis transformation (TRAORI)
Transformations
341