PROGRAMMING20. AXIS CONTROL FUNCTIONS
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The Electronic Gear Box is a function for rotating a workpiece in sync with
a rotating tool, or to move a tool in sync with a rotating workpiece. With this
function, the high–precision machining of gears, threads, and the like can be
implemented. A desired synchronization ratio can be programmed.
Up to two sets of axes can be synchronized. A gear grinding machine can
be controlled, for instance, by using one axis for rotating the workpiece in
sync with the tool and another axis for performing dressing in sync with the
tool.
The electronic gear box is hereinafter called an EGB function.
Spindle : EGB master axis serving as a tool axis
First axis : X
Second axis : Y
Third axis : C axis (EGB slave axis serving as a workpiece axis)
Fourth axis : C axis (EGB dummy axis, which cannot be used as a usual
controlled axis)
Fifth axis : V axis (EGB slave axis serving as a dressing axis)
Sixth axis : V axis (EGB dummy axis, which cannot be used as a usual
controlled axis)
+
–
CNC
Spindle
amplifier
Motor
Spindle (master axis)
First axis X (omitted)
Second axis Y (omitted)
Tool axis
Third axis
Slave axis
Fourth axis
Dummy axis
Follow–up
EGB
C
–
+
+
–
+
K
1
: Synchronization factor
K
2
: Synchronization factor
Slave axis
EGB
V
–
+
+
Dressing axis
K
1
Error counter
Synchronization
switch
Detector
Speed/current
control
Servo
amplifier
Position
control
K
2
Detector
V–axis
Workpiece axis
C–axis
Fifth axis
Spindle
Sixth axis
Dummy axis
Follow–up
Speed/current
control
Position
control
Error counter
Synchronization
switch
Servo
amplifier
Motor
Motor
Detector
Fig.20.8.5
20.8.5
Electronic Gear Box 2
Pair
General
D Configuration examples
of controlled axes