Siemens SINUMERIK 828D Programming Manual page 158

Feed control
7.12 Tooth feedrate (G95 FZ)
● Without preprocessing stop in the part program via system variables:
Note
If
G95
158
$P_FZ
$P_F_TYPE
is not active, the $P_FZ and $AC_FZ variables will always return a value of zero.
Programmed tooth feedrate
Programmed path feedrate type
Value: Significance:
0 mm/min
1 mm/rev
2 inch/min
3 inch/rev
11 mm/tooth
31 inch/tooth
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals