
B–63002EN/01
21. AXES CONTROL
NC FUNCTION
251
Gears can be cut by turning the workpiece (C–axis) in sync with the
rotation of the spindle (hob axis) connected to a hob.
Also, a helical gear can be cut by turning the workpiece (C–axis) in sync
with the motion of the Z–axis (axial feed axis).
Spindle
C–axis
Gear material
Helical gear
Hob
G81T_L_Q_P_;
T : Number of teeth (Specifiable range: 1 to 5000)
L : Number of hob threads (Specifiable range: 1 to 20 with a sign)
⋅ The sign of L specifies the direction of rotation of the C–axis.
⋅ If L is positive, the C–axis rotates in the positive direction (+).
⋅ If L is negative, the C–axis rotates in the negative direction (–).
Q : Module or diametral pitch
For metric input, specify a module.
(Units: 0.00001 mm, Specifiable range: 0.01 to 25.0 mm)
For inch input, specify a diametral pitch.
(Units: 0.00001 inch
–1
, Specifiable range: 0.01 to 250.0 inch
–1
)
P : Gear helix angle
(Units: 0.0001 deg, Specifiable range: –90.0 to +90.0 deg)
P and Q must be specified when a helical gear is to be cut.
G80 ; Cancels synchronization between the hob axis and C–axis.
21.18
HOBBING MACHINE
FUNCTION (G80, G81)
(M series)
M series
Format