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4.
Loosen preload cap screw (see Figure 151)
a few turns until it no longer contacts head-
stock.
5.
Tap outside of gap insert with dead blow
hammer to loosen it, and, with help of another
person, remove gap insert.
Re-Installing Gap Insert
1.
Clean all mating surfaces completely with
mineral spirits. Inspect and remove any
burrs. ALL MATING SURFACES MUST BE
ABSOLUTELY CLEAN!
2.
Lightly oil a lint-free cloth with way oil, and
rub a thin film into pores of freshly cleaned
gap surfaces. Next, place insert in position on
lathe bed.
3.
Back off threaded dowel pin jack nuts until
they are flush with end of pins, then 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 closer into alignment.
Using blocks of wood and clamps to get
mating surfaces into alignment can also be
helpful.
6.
When alignment and flush mating is accept-
able, tighten four cap screws in a pattern that
will maintain or improve 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 gap to achieve required alignment.
8.
When satisfied with alignment, tap dowel pins
rest of way into gap until they are in a fully
seated position, and thread jack nuts down
until they just contact gap.
9.
Tighten preload cap screw until it contacts
headstock and resistance can be felt, then
tighten it an additional
Model G0791 (Mfd. Since 9/15)
⁄
-turn.
3
4
Adjusting 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 152.
Fabricate pin to
⁄
" D x
7
32
Figure 152. Spanner wrench diagram.
Tools Needed
Spanner Wrench 80–90mm Hook-Type ............ 1
Chuck Key ......................................................... 1
Dead Blow Hammer .......................................... 1
Piece of Scrap Wood......................................... 1
Dial Indicator ..................................................... 1
Hex Wrench 6mm .............................................. 1
Adjusting 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
-91-
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