Operating Principal
Eight oblong circuits of balls (two
in each of four gibs) are provided within the Bearing Housing,
each of which has the balls in one of its straight sides in bearing
contact between the inner surface of the Ball Bushing Gib and
the Shaft. The load is actually rolled freely along on the balls
in this portion of the circuit. Balls in the remainder of the
circuit are free to roll in clearance, ground out in the hardened
base of the Gib.
A retainer closure, machined in
upper part of the Gib, guides the balls in their track and prevents
them from falling out when the Bearing Assembly is removed from
the sliding shaft or ram.
The four Gibs, nested within the
Housing, form fixed (wrap-around) eight-point ball bearing contact
on eight edges and four corners of the shaft. Adjustment for
no play is made on two Gibs- one on top, one on side of the housing
with two self-locking set screws. Two other Ball Bearing Gibs
are in fixed position on opposite side walls of the Housing.
