
PROGRAMMING
B–63534EN/02
20. AXIS CONTROL FUNCTIONS
551
In the same way as with the hobbing machine function, 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.
Some conditions must be satisfied for setting the workpiece axis and tool
axis. For details, refer to the relevant manual provided by the machine
tool builder.
G81 T _ L _ Q _ P _ ; Starts synchronization.
S_ M03 (or M04) ; Starts tool axis rotation.
M05 ; Stops tool axis rotation.
G80 ; Cancels synchronization.
T : Number of teeth (Specifiable range: 1 to 1000)
L : Number of hob threads
(Specifiable range: –21 to +21 with 0 excluded)
Q : Module or diametral pitch
Specify a module in the case of metric input.
(Unit: 0.00001 mm, Specifiable range: 0.01 to 25.0 mm)
Specify a diametral pitch in the case of inch input.
(Unit: 0.00001 inch
–1
, Specifiable range: 0.01 to 25.0 inch
–1
)
P : Gear helix angle
(Unit: 0.0001 deg, Specifiable range: –90.0 to 90.0 deg.)
* When specifying Q and P, the user can use a decimal point.
20.8
SIMPLE ELECTRIC
GEAR BOX
(G80, G81)
20.8.1
Simple Electric Gear
Box (G80, G81)
Format