Synchronized spline rolling heads are used to roll precision parts
which must fit with a mating part. They are also used where the
length of the part would cause excessive deflection when rolling
from one side. A synchronizing mechanism is needed when more than
one straight die is used to prevent mis-tracking and minimize spacing
error. Mis-tracking is when rolling dies produce the wrong number
of teeth (often twice as many as desired). Spacing error is when
the distance from tooth to tooth varies, causing mating parts not
to fit together.
The synchronizing gear aligns the teeth on each
rolling die in relation to the others. When rolling the synchronizing
gear is pushed back into the head. When the part is retracted,
a spring returns the synchronizing gear to its original position.
The cam adjustable type allows the three dies
to be adjusted with a single adjustment, making setup easier
than heads with independent adjustment.