Siemens SINUMERIK 840D sl Operating Manual page 424

Programming technological functions (cycles)
8.4 Turning - only for G code programs
Parameter
Hirth tooth system
Position
X0
Z0
X1
UX
* Unit of feedrate as programmed before the cycle call
Parameters, G code program (undercut, form F)
PL Machining plane
SC Safety clearance
F Feedrate
424
Description
Round to the next Hirth gearing
•
Round to Hirth gearing
•
Round to Hirth gearing
•
Note:
For machines with Hirth tooth system
Form E machining position:
Undercut size according to DIN table:
E.g.: E1.0 x 0.4 (undercut form E)
Reference point X ∅
Reference point Z
Allowance in X ∅ (abs) or allowance in X (inc)
Cross feed ∅ (abs) or cross feed (inc)
mm
*
T
D Cutting edge number
F
S / V Spindle speed or
Constant cutting rate
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Unit
mm
mm
mm
mm
mm/min
mm/rev
rpm
m/min
Milling