Installation manual
CNC 8055
CNC 8055i
CONCEPTS
7.
SOFT: V02.2X
·297·
Axes and coordinate systems
7.1.3 Slaved axes and synchronized axes
Coupled or synchronized axes are two or more axes which are normally independent, but,
sometimes need to be moved at the same time and in synchronism (temporarily slaved, versus
permanently as by machine parameter). For example on multi-spindle milling machines.
Slaved axes
• With function G77 it is possible to define which axes are to be coupled (temporarily slaved) by
indicating the main axis and its subordinates or slave axes.
• It is possible to slave more than two axes to each other, to have several different electronic
couplings (slaving), to add a new slave to the ones previously slaved, etc.
• With function G78, it is possible to decouple (unslave) one or all of the axes slaved temporarily;
that is by means of G77, and not by machine parameter GANTRY (which would be "permanent"
slaving).
Synchronized axes
• The axes are synchronized by the PLC, by activating the CNC input "SYNCHRO" of the axis to
become the slave.
• To be able to do this, axis parameter SYNCHRO (P3) of that axis must be set indicating which
axis will be its master.
• It is possible to couple (slave) more than two axes to each other, to have several other axes slaved
to each other, to add a new slave to existing ones, etc; but, they will always be slaved to the axes
determined by the corresponding SYNCHRO parameters:
• To decouple (unslave) one of the slaved axes, the corresponding "SYNCRO" input of the CNC
must be deactivated.
If the machine has the X, Y, Z, V, W axes, the following signals must be activated (logic state "1")
at the PLC:
SYNCHRO4 to slave the V axis to the Y axis.
SYNCHRO5 to slave the W axis to the Z axis.
Example of a dual-spindle bridge type milling machine with two pairs of slaved axes (Y-V,
Z-W).
Slaving (by program).
G77 Y V
G77 Z W
Synchronization (by external signal).
Y axis SYNCHRO = 0
V axis SYNCHRO = 2
Z axis SYNCHRO = 0
W axis SYNCHRO = 3
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