Siemens SINUMERIK 840D sl Operating Manual page 442

Programming technological functions (cycles)
8.4 Turning - only for G code programs
Parameters, G code program
PL Machining plane
SC Safety clearance
F Feedrate
Parameter
DIR
S
V
SV
X0
Z0
FS or R
X1
FR
SR
X2
* Unit of feedrate as programmed before the cycle call
442
mm
*
Description
Direction of spindle rotation
Spindle speed
Constant cutting rate
Maximum speed limit - (only for constant cutting rate V)
Reference point in X ∅ (abs, always diameter)
Reference point in Z (abs)
Chamfer width or rounding radius
Depth for speed reduction ∅ (abs) or depth for speed reduction in relation to X0
(inc)
Reduced feedrate
Reduced speed
Final depth ∅ (abs) or final depth in relation to X1 (inc)
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Unit
rev/min
mm/min
rev/min
mm
mm
mm
mm
*
rev/min
mm
Milling