
20.AXIS CONTROL FUNCTIONS NC FUNCTIONS B-63322EN/03
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20.12 ELECTRONIC GEAR BOX (G80, G81, G80.5, G81.5)
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 specification method differs depending on the configuration of the
machine. The Electronic Gear Box is hereafter referred to as the EGB
function.
- Example of Controlled Axis (Gear grinder)
Spindle :EGB master axis: Tool axis
First axis :X
Second axis :Y
Third axis :C-axis (EGB slave axis: Workpiece axis)
Fourth axis :C-axis (EGB dummy axis: Not usable as an
ordinary controlled axis)
Fifth axis :V-axis (EGB slave axis: Dressing axis)
Sixth axis :V-axis (EGB dummy axis: Not usable as
an ordinary controlled axis)
+
-
CNC
Motor Spindle Detector
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
Fifth axis
Slave axis
Sixth axis
Dummy axis
Follow-up
EGB
V
-
+
+
Dressing axis
K
1
Error counter
Synchronization switch
Motor
Detector
Servo amplifier
K
2
Error counter
Synchronization switch
Motor
Detector
V-axis
Workpiece axis
C-axis
Spindle amplifier
Position control Speed/current control
Position control Speed/current control Servo amplifier