Siemens SINUMERIK 828D Programming Manual page 117

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Traverse rotary axes with path velocity F (FGREF)

For machining operations, in which the tool or the workpiece or both are moved by a rotary

axis, the effective machining feedrate is to be interpreted as a path feed in the usual way by

reference to the F value. This requires the specification of an effective radius (reference

radius) for each of the rotary axes involved.

The unit of the reference radius depends on the

All axes involved must be included in the

calculation of the path feedrate.

In order to ensure compatibility with the behavior with no

degree = 1 mm is activated on system power up and RESET. This corresponds to a

reference radius of FGREF= 360 mm/(2π) = 57.296 mm.

This default is independent of the active basic system

(MD10240 $MN_SCALING_SYSTEM_IS_METRIC) and the currently active

Special situations:

Program code

N100 FGROUP(X,Y,Z,A)

N110 G1 G91 A10 F100

N120 G1 G91 A10 X0.0001 F100

With this type of programming, the F value programmed in

axis feedrate in degrees/min, while the feedrate evaluation in

100 mm/min, dependent upon the currently active

Fundamentals

Programming Manual, 07/2010, 6FC5398-1BP40-0BA0

7.1 Feedrate (G93, G94, G95, F, FGROUP, FL, FGREF)

command to be taken into account in the

programming, the factor 1

is evaluated as the rotary

is either 100 inch/min or

Feed control

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