Spindle Bearing Preload - Grizzly G4003G Owner's Manual

4. Loosen preload cap screw (see Figure 118)
a few turns until it no longer contacts head-
stock.
5. Tap outside of gap piece with dead blow
hammer to loosen it, and, with help of another
person, remove gap piece.
To re-install the gap:
1.
Clean all mating surfaces completely with
mineral spirits. Inspect and remove any burrs.
2.
Lightly oil a lint-free cloth with way oil, and
rub a thin film into pores of freshly cleaned
gap surfaces. Next, place gap in position on
lathe bed.
3.
Back off threaded alignment pin hex nuts until
they are flush with end of pins, and drop pins
into pin holes in gap.
4.
Jostle gap closer to its final alignment until
pins seat naturally.
5.
Install and lightly snug four cap screws in an
order that will draw gap closer into alignment.
Using blocks of wood and clamps to get mat-
ing surfaces into alignment can also be help-
ful.
6. When alignment and flush mating is accept-
able, tighten four cap screws in a pattern that
will maintain or improve the alignment.
7. Wait 24 hours, and check for quality of mat-
ing. If unacceptable, use clamps and blocks
of wood, and loosen and tighten appropriate
cap screws to draw-in and release certain
areas of the gap to achieve required align-
ment.
8. When satisfied with alignment, tap alignment
pins rest of way into gap until they are in a
fully seated position, and thread hex nuts
down until they just contact gap.
9.
Tighten preload cap screw inward until it con-
tacts headstock and resistance can be felt,
then tighten it an additional
Model G4003G (Mfd. Since 1/15)
⁄ -turn.
3
4
Spindle Bearing
Preload
This lathe is shipped from the factory with the
spindle bearing preload properly adjusted. If the
spindle ever develops a bit of end-play and the
workpiece finish suffers, you can adjust the bear-
ing preload to remove the end-play and improve
the workpiece finish.
Adjusting the bearing preload requires using a
spanner wrench or a punch and hammer. You
can either purchase the spanner wrench at a tool
store or fabricate one, using the diagram shown
in Figure 119.
Fabricate pin to ⁄ " D x
7
32
Figure 119. Spanner wrench diagram.
Tools Needed
Spanner Wrench................................................ 1
Chuck Key ......................................................... 1
Dead Blow Hammer .......................................... 1
Piece of Scrap Wood......................................... 1
Dial Indicator ..................................................... 1
Hex Wrench 6mm .............................................. 1
To adjust preload:
1. Run lathe for 20 minutes on high speed to
bring lathe to a normal temperature.
2. DISCONNECT MACHINE FROM POWER!
Fabricate from CRS
or HRS bar stock
⁄ " L and weld.
1
4
Qty
-75-