I. Bearing Assembly
The Teres bearing was designed to
have a lot of viscous damping. This
damping helps swamp the effects of
stylus drag, resulting in better speed
stability. For this reason heavy oil (30
weight) is provided. With heavy oil
the bearing will turn smoothly but
there will be a lot of resistance. This
is by design.
lease read this information carefully
before assembling your bearing. The
Teres bearing has been machined with
very close tolerances. The radial
clearance in the bearing is only 4 to 5
ten-thousandths. This tight tolerance
results in superb stability reducing
rocking to microscopic levels.
However, with these tolerances it is
imperative that the bearing is clean
and that proper procedure is used for
assembly. The objective is to have the
bearing completely full of clean oil,
including the recess in the top of the
bearing housing. If air becomes
trapped in the bearing it will not seat
properly. The bearing must be
assembled dry to avoid trapping air.
Note: Your bearing assembly may
come partially assembled. If any
components are already installed they
do not need to be removed and the
step may be skipped. The procedure:
1. Using the included 6-32 screw
attach the bearing ground wire
(bare wire extending from the
sensor cable) to the bottom of the
brass bearing housing. ointing the
crimp connector toward the center
of the bearing will make it easier to
install the bearing into the base.
2. Attach the brass bearing housing to
the base using the supplied 1-1/8"
nut. Hold the bearing housing
tightly in one hand and tighten the
bearing nut with a large wrench or
pliers. The bearing nut should be
snug but not excessively tight.
3. Clean the bearing housing and
spindle thoroughly. Wiping down
the bearing surfaces with rubbing
alcohol on lint free cloth works well.
4. Fill the recess in the bottom of the
spindle with oil and press in the ball
bearing. This displaces air in the
recess and will hold the ball bearing
in place. Be sure to completely wipe
away any excess oil.
5. If not already installed place the
brass thrust plate in the bottom of
the bearing housing with the white
Delrin button facing upward. The
thrust plate needs to be held flat as
it is lowered into the bearing. A
simple method is to attach a small
loop of tape to the end of a pencil.
Then stick the thrust plate to the
pencil and lower it in place. Be
sure that the Delrin button is facing
up!
6. Carefully pour 3.8ml of oil into the
bearing housing without getting any
oil on the sides of the bearing. The
oil level should be just slightly
below the top edge of the lower
journal as shown in the illustration.
