Siemens SINUMERIK 840D sl Function Manual page 143

Cutting edge position and cut direction
Turning tools are limited by their main and secondary cutting edges. The cutting edge position
is defined via the position of the primary and secondary cutting edges relative to the coordinate
axes. Two different cutting directions can be assigned to each cutting edge position.
①
Cutting edge position (1 - 8)
②
Cutting directions (1 - 4) assigned to the cutting edge position
Figure 2-41 Cutting edge position and cut direction
Cutting edge position
For cutting edge position 1 - 4, the primary and secondary cutting edge are in the same
quadrant.
For a cutting edge position of 5 - 8, the primary and secondary cutting edge are in adjacent
quadrants or there is a coordinate axis between the two cutting edges.
The cutting edge position is stored in the tool parameter $TC_DP2.
Cut direction
The cut directions 1 - 4 denote a positive or negative direction of the coordinate axes:
● 1: Ordinate -
● 2: Ordinate +
● 3: Abscissa -
● 4: Abscissa +
The cut direction is stored in the tool parameter $TC_DP11.
Tools
Function Manual, 06/2019, A5E47435126B AA
2.9 Modification of the offset data for rotatable tools
W1: Tool offset
143