
B–63522EN/02
21. AXES CONTROL
NC FUNCTION
297
To machine (grind/cut) a gear, the rotation of the workpiece axis
connected to a servo motor is synchronized with the rotation of the tool
axis (grinding wheel/hob) connected to the spindle motor. To
synchronize the tool axis with the workpiece axis, an electric gear box
(EGB) function is used for direct control using a digital servo system.
With the EGB function, the workpiece axis can trace tool axis speed
variations without causing an error, thus machining gears with great
precision.
A dedicated servo axis is also used for the tool axis, connected to the
spindle motor and for which the rotational position must be read directly
by the digital servo system (this axis is called the EGB axis).
Position
control
Error counter
Synchronization
coefficient
DMR
Spindle amplifier
CNC
Tool axis rotation command
Servo amplifier C–axis Detector
PC
Spindle
motor
Tool axis
Position
detector
Position
coder
α pulses/rev
Feedback connector for workpiece axis
Feedback connector for EGB axis
Command connector for EGB axis
(dummy connector not required)
β pulses/rev
Synchroniza-
tion switch
+
–+
Work piece
axis
EGB axis
+
G81 T _ L _ Q _ P _ ; Starts synchronization.
T : Number of teeth
L : Number of hob threads
Q : Module or diametral pitch
Specify a module in the case of metric input.
Specify a diametral pitch in the case of inch input.
P : Gear helix angle
G80: Cancels synchronization
21.19
SIMPLE ELECTRIC
GEAR BOX (G80, G81)
(M series)
M series
Format