The FRB live center with axial load distribution has two thurst bearings
6 and 7 between which a specially designed belleville spring washer
% is inserted to distribute the load between the two bearings. When a
thrust acts on the center @ it will retract up to 0.25 mm (inch. 0.0098)
which corresponds to 500 Kg (1102.3 lb) of axial load for the FRB live
center morse taper 4 that is absorbed by the back bearing 7.
As the center shaft # has now moved inside by 0.25 mm (inch.
0.0098) it comes to rest on the inner ring of the cylindrical roller
bearing 4, thereby transmitting the remaining force to the front
bearing 6. This patented center allows the center to apply a very high
rate of live center thrust to the process.
When turning shafts held by face driver, machining can be carried out
with an accordingly high feed rate and cutting depth.
The two roller cages 8 support heavy radial loads, and a vibrationsdamping bush & kept stiff by a spring * which prevents vibration.
The nut $ at the front of the live center can be adjusted to eliminate
the play caused by worn bearings by means of a caliper wrench.
A chip guard ring ) guarantees complete insulation of the sealing
ring 2 from chips. The back extraction nut 0 prevents deflection
The extraction nut is fitted on the basic body to give the live center maximum stiffness and
check deflection or vibrations caused by deformation of the basic body.
To fix, follow this procedure:
(a) fix the live center in the tailstock sleeve;
(b) unscrew the nut until it comes to rest on the live center sleeve;
(c) when it is in position tighten firmly with both hands.