Siemens SINUMERIK 828D Function Manual page 1369

The path velocity is calculated from the actual speed of the spindle according to the following formula:
and V: Path velocity in mm/min or inch/min
n: Speed of the master spindle in rpm
F: Programmed revolutional feedrate in mm/rev or inch/rev
Note
The programmed F value is deleted when the system switches between the feedrate types
G93, G94 and G95.
Tooth feedrate
Primarily for milling operations, the tooth feedrate FZ..., which is more commonly used in practice, can be
programmed instead of the revolutional feedrate F...: (feed distance per tooth).
The control uses the $TC_DPNT (number of teeth per revolution) tool parameter associated with the active tool
offset data record to calculate the effective revolutional feedrate for each traversing block from the programmed
tooth feedrate.
with F:
FZ:
$TC_DPNT:
Example: Milling cutter with 5 teeth ($TC_DPNE = 5)
Program code
N10 G0 X100 Y50
N20 G1 G95 FZ=0.02
N30 T3 D1
M40 M3 S200
N50 X20
...
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Revolutional feedrate in mm/rev or inch/rev
Tooth feedrate in mm/tooth or inch/tooth
Tool parameter: Number of teeth/rev
Comment
; Tooth feedrate 0,02 mm/tooth
; Load tool and activate tool offset data record.
; Spindle speed 200 rpm
; Milling with:
FZ = 0.02 mm/tooth
? effective revolutional feedrate:
F = 0.02 mm/tooth * 5 teeth/rev = 0.1 mm/rev
or:
F = 0.1 mm/rev * 200 rpm = 20 mm/min
V1: Feedrates
17.2 Path feedrate F
1369