Working with a B axis (only 840D sl)   
15.1 Lathes with B axis 
  Turning 
726  Operating Manual, 03/2013, 6FC5398-8CP40-3BA1 
Alignment angles β and γ  
Alignment angles β and γ are required for turning with tool alignment. 
;
=
˟
ˠ
 
β: Rotation around the Y axis (with the B axis) 
γ: Rotation around the Z axis (with the tool spindle)