Siemens SINUMERIK 840DE Programming Manual page 256

Feedrate Control and Spindle Motion
7.1 Feedrate (G93, G94, G95 or F..., FGROUP, FGREF)
Units of measurement and calculation
Machine manufacturer
See machine manufacturer's specifications.
Units of measurement for feedrate F
You can use the following G commands to define the units of measurement for the feed
input. Feedrate functions are not affected by G70/G71.
Note
With G700/G710, feedrate values F are interpreted as geometrical parameters in the
system of units set by G function (G700: [inch/min]; G710: [mm/min]).
Feedrate G93
Unit 1/rpm. The inverse-time feedrate specifies the time required to execute the motion
commands in a block.
Example: N10 G93 G01 X100 F2 means: the programmed path is traversed in 0.5 min.
Note
If the path lengths vary greatly from block to block, a new F value should be specified in
each block with G93. The feedrate can also be specified in deg/rev when machining with
rotary axes.
7-6
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals