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4. PROGRAM FORMAT
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Program format T series M series
G81 T_ L_ R1 ; Synchronization start
G80 R1 ; Synchronization end
T : Number of teeth (range of valid settings:
1–1000)
L : Number of hob threads (range of valid set-
tings: –21 to +21, excluding 0)
When L is positive, the direction of rotation
about the workpiece axis is positive (+ direc-
tion).
When L is negative, the direction of rotation
about the workpiece axis is negative (– direc-
tion).
G81 T_ L_ R2 ; Synchronization start
G80 R2; Synchronization end
T : Number of teeth (range of valid settings:
1–1000)
L : Number of hob threads (range of valid set-
tings: –21 to +21, excluding 0)
When L is positive, the direction of rotation
about the workpiece axis is positive (+ direc-
tion).
When L is negative, the direction of rotation
about the workpiece axis is negative (– direc-
tion).
D Acceleration/deceleration type
D Acceleration/deceleration plus
D automatic phase synchronization type
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G81.1 Z__ Q__ R__ F__ ;
G80; Cancels chopping
Z : Upper dead point
(For an axis other than the Z–axis, specify the
axis address.)
Q : Distance between the upper dead point and
lower dead point
(Specify the distance as an incremental val-
ue, relative to the upper dead point.)
R : Distance from the upper dead point to point R
(Specify the distance as an incremental val-
ue, relative to the upper dead point.)
F : Feedrate during chopping
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G81.4 R_ L_ Q_ P_ ;
G80.4 ; Cancels synchronization between the hob
axis and C–axis.
(Supplement) The hobbling machine function is
made available to the M series with
G81.
R : Number of teeth (specifiable range : 1 to 500)
L : Number of hob threads (specifiable range : 1
to 30 with a sign)
D The sign of L specifies the direction of
rotation of the C–axis.
D If L is positive, the C–axis rotates in the
positive direction (+).
D 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.
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