Siemens SINUMERIK 840Di Function Manual page 742

Detailed Description
2.1 Axes
2.1.10 Synchronized axes
Meaning
Synchronous axes are components of the path axes, which are not referenced in order to
calculate the tool path velocity. They are interpolated together with path axes (all path axes
and synchronous axes of one channel have a common path interpolator).
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 instruction 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
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 AXCONF_CHANAX_NAME_TAB
2-12
;
; 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 = 500 mm/min
because only half the distance is to be
traversed.
Axis Types, Coordinate Systems, Frames (K2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0