Fanuc Series 15i/150i-MA (Programming) Operators Manual

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19.9.2 Command Specification Compatible with Hobbing Machine
Synchronization can be specified in the same way as the operation of a
hobbing machine is specified.
When the canned cycle option is specified, this specification method
cannot be used.
If two sets of axes are specified for synchronization by this method, the
EGB axis subjected to synchronization is determined by parameter
G81 T_ ( L_ ) ( Q_ P_ ) ; Synchronization started
G80 ; Synchronization canceled
T : Number of teeth(Range of valid settings: 1 to 1000)
L : Number of hob threads
(Range of valid settings: -21 to +21 excluding 0
). Specify the direction of rotation about the C-axis
with the sign of L:
When the sign of L is positive, rotation about the C-
axis is in the forward (+) direction.
When the sign of L is negative, rotation about the C-
axis is in the reverse (-) direction.
Q : Module or diametral pitch
Specify a module for metric input.
(Unit: 0.00001 mm, Range of valid settings: 0.1 to
Specify a diametral pitch for inch input.
(Unit: 0.0001 inch-1, Range of valid settings: 0.1 to
P : Gear helix angle
(Unit: 0.0001 degree, Range of valid settings: -90.0
degrees to +90 degrees)
Note) Decimal places can be specified in the Q and P
- Start of synchronization
P and Q are specified when using helical gear compensation. If only P
or Q is specified, alarm PS0594 is output.
When G81 is specified to start synchronization mode, synchronization
control of the spindle and the workpiece rotation axis (C-axis) starts.
During synchronization, the ratio of the rotation about the C-axis to the
rotation of the spindle is made equal to the following ratio:
T (number of teeth) : L (hob threads)
If another G81 command is specified during synchronization without
canceling synchronization, the synchronization factor is updated by T
and L if specified. If only P and Q are specified and T and L are not,

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