Siemens SINUMERIK 840DE Programming Manual page 274

Feedrate Control and Spindle Motion
7.7 Feedrate for positioning axes/spindles (FA, FPR, FPRAON, FPRAOF)
Note
The programmed feedrate FA[...] is modal.
Up to 5 feeds for positioning axes or spindles can be programmed in each NC block.
Example of synchronous spindle link
With synchronous spindle link, the positioning speed of the following spindle can be
programmed independently of the master spindle – for example, for positioning operations.
Example: FA[S2]=100
The spindle identifiers SPI(...) and S... are identical in terms of function.
Example of calculating the derived feedrate FPR
The derived feedrate is calculated according to the following formula:
Derived feedrate = programmed feedrate * Absolute master feedrate
Example: Path axes X, Y must be traversed at the revolutional feedrate derived from rotary
axis A:
N40 FPR(A)
N50 G95 X50 Y50 F500
Feedrate FA[...]
The feedrate is always G94. When G70/G71 is active, the unit of measurement is
metric/inches according to the default setting in the machine data. G700/G710 can be used
to modify the unit of measurement in the program.
Notice
If no FA is programmed, the value defined in the machine data applies.
7-24
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals