
B–63523EN–1/03
1. AXIS CONTROL
280
1 Start of synchronization
When synchronization mode is set with G81, the synchronization
switch of the EGB function is closed, and synchronization between the
tool axis and workpiece axis starts. At this time, synchronization
mode signal SYNMOD is turned on. During synchronization, the
rotation of the tool axis and workpiece axis is controlled so that the
relationship between T (number of teeth) and L (number of hob
threads) can be maintained. Moreover, the synchronous relationship
is maintained regardless of whether the operation is automatic or
manual during synchronization.
G81 cannot be specified again during synchronization. Moreover, the
specification of T, L, Q, and P cannot be modified during
synchronization.
2 Start of tool axis rotation
When the rotation of the tool axis starts, the rotation of the workpiece
starts so that the synchronous relationship specified in the G81 block
can be maintained.
The rotation direction of the workpiece axis depends on the rotation
direction of the tool axis. That is, when the rotation direction of the
tool axis is positive, the rotation direction of the workpiece axis is also
positive; when the rotation direction of the tool axis is negative, the
rotation direction of the workpiece axis is also negative. However, by
specifying a negative value for L, the rotation direction of the
workpiece axis can be made opposite to the rotation direction of the
tool axis.
During synchronization, the machine coordinates of the workpiece
axis and EGB axis are updated as synchronous motion proceeds. On
the other hand, a synchronous move command has no effect on the
absolute and relative coordinates.
3 Termination of tool axis rotation
In synchronism with gradual stop of the tool axis, the workpiece axis
is decelerated and stopped. By specifying the command below after
the spindle stops, synchronization is canceled, and the EGB
synchronization switch is opened. At this time, the synchronization
mode signal (SYNMOD) is turned off.
4 Cancellation of synchronization
The position of the workpiece axis after travel during synchronization
is reflected in the absolute coordinates when synchronization is
canceled; from this point, absolute command programming is enabled
for the workpiece axis. By setting bit 0 (HBR) of parameter No. 7700
to 0, synchronization can also be canceled upon reset.
* The synchronization mode is canceled by a servo alarm, PS000
alarm, or emergency stop.
Explanations
D Synchronization control