Siemens SINUMERIK 840D sl Programming Manual page 112

Feed control
7.1 Feedrate (G93, G94, G95, F, FGROUP, FL, FGREF)
Further information
Feedrate for path axes (F)
The path feedrate is generally composed of the individual speed components of all geometry
axes participating in the movement and refers to the center point of the cutter or the tip of the
turning tool.
The feedrate is specified under address F. Depending on the default setting in the machine
data, the units of measurement specified with the G commands are either in mm or inch.
One F value can be programmed per NC block. The feedrate unit is defined using one of the
G commands G93/G94/G95. The feedrate F acts only on path axes and remains active until a
new feedrate is programmed. Separators are permitted after the address F.
Examples:
F100 or F 100
F.5
F=2*FEED
Feedrate type (G93/G94/G95)
The G commands G93, G94 and G95 are modal. In the event of switching between G93, G94
and G95, the path feedrate value has to be reprogrammed. When machining with rotary axes,
the feedrate can also be specified in degrees/min.
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals