
PROGRAMMING20. AXIS CONTROL FUNCTIONS
B–63534EN/02
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Synchronization between the hob axis and C–axis can also be canceled
when:
⋅ The power is turned off.
⋅ An emergency stop or servo alarm occurs.
⋅ A reset (external reset signal, reset & rewind signal, or reset key on the
MDI panel) is issued.
By setting bit 0 (HBR) of parameter No. 7700, the release of the
synchronization status by a reset can be suppressed.
When a helical gear is to be cut, compensation for the C–axis is needed
according to the amount of travel along the Z–axis (third axis) (axial feed)
and gear helix angle.
Helical gear compensation is performed by adding compensation pulses,
calculated using the formula below, to the C–axis which is synchronized
with the hob axis:
Compensation angle =
π T Q
Z sin (P)
360 (For metric input)
or
Compensation angle =
π T
Z Q sin (P)
360 (For inch input)
where
Compensation angle : Signed absolute value (deg)
Z : Amount of travel along the Z–axis after the
specification of G81 (mm or inches)
Total amount of travel along the Z–axis in both
automatic and manual modes
P : Signed gear helix angle (deg)
T : Number of teeth
Q : Module (mm) or diametral pitch (inch
–1
)
The values of P, T, and Q must be programmed.
D Releasing the
synchronization status
D Helical gear
compensation