Siemens SINUMERIK 840D sl Operating Manual page 240

Grinding with a B axis (only for cylindrical grinding machines)
10.1 Overview
X
Z
Figure 10-2 Beta rotation
Changing the cutting edge position
The second rotary axis is controlled with the aid of the "Machining opposite" selection box, and
the cutting edge position is changed via the CUTMOD function (e.g. internal grinding).
240
β
X
Z
Operating Manual, 05/2017, A5E40869190
β
Grinding