Siemens SINUMERIK 840D sl Programming Manual page 113

Inverse-time feedrate (G93)
The inverse-time feedrate specifies the time required to execute the motion commands in a
block.
Unit: rpm
Example:
N10 G93 G01 X100 F2
Significance: 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. When machining with rotary axes, the feedrate can also be specified in
degrees/min.
Feedrate for synchronized axes
The feedrate programmed under address F applies to all the path axes programmed in a
block but not to the synchronized axes. The synchronized axes are controlled such that they
require the same time for their path as the path axes, and all axes reach their end point at the
same time.
Limit velocity for synchronized axes (FL)
The FL command can be used to program a limit velocity for synchronized axes. In the
absence of a programmed FL, the rapid traverse velocity applies. FL is deselected by
assignment to MD (MD36200 $MA_AX_VELO_LIMIT).
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
7.1 Feedrate (G93, G94, G95, F, FGROUP, FL, FGREF)
Feed control
113