Siemens SINUMERIK 840D sl Function Manual page 674

K2: Axis Types, Coordinate Systems, Frames
10.2 Axes
All path axes and all synchronous axes of a channel have the same acceleration phase,
constant travel phase and deceleration phase.
The feedrate (path feedrate) programmed under address F applies to all the path axes
programmed in a block but not to the synchronous axes.
Synchronous axes take the same time to cover the programmed path as the path axes.
FGROUP command
The command FGROUP specifies whether the axis is a feed-defining path axis (used to calculate
the path velocity) or a synchronous axis (not used to calculate the path velocity).
Example
Program code
N05 G00 G94 G90 M3 S1000 X0 Y0 Z0
N10 FGROUP(X,Y)
N20 G01 X100 Y100 F1000
N30 FGROUP (X)
N20 X200 Y150
Note
The channel axis name must be used for the FGROUP command.
This is defined by the machine data:
MD20080 $MC_AXCONF_CHANAX_NAME_TAB (name of the channel axis in the channel)
Application
In the case of helical interpolation FGROUP can be programmed to determine whether:
● The programmed feedrate should be valid on the path
(all three programmed axes are path axes)
● The programmed feedrate should be valid on the circle
(two axes are path axes and the infeed axis is a synchronous axis)
674
Comment
;
; Axes X/Y are path axes,
Z is a synchronous axis.
; Progr. feedrate 1000 mm/min.
Feedrate of axis X = 707 mm/min.
Feedrate of axis Y = 707 mm/min.
; Axis X is a path axis,
axis Y is a synchronous axis
; Progr. Feedrate 1000 mm/min
Feedrate of Axis X = 1000 mm/min
Feedrate of Axis Y is set to 500 mm/min,
because only half the distance is to be
traversed.
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions