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Gap Insert Removal
& Installation
this lathe is equipped with a removable gap
insert that will allow for turning large diameter
workpieces. the gap was seated, pre-loaded,
and then ground for precise mating and alignment
at the factory.
removing the gap can cause the lathe insert to
slightly spring out of shape. When re-installed,
there is no guarantee that original alignment and
flush mating will be the same. For this reason,
removing the gap is considered a permanent
alteration to the lathe, even if it is later re-installed.
Tools Needed
open End Wrench 14mm .................................. 1
hex Wrench 8mm .............................................. 1
heavy dead Blow hammer ............................... 1
Miscellaneous C-Clamps ................ As required
Wooden Blocks ............................... As required
To remove the gap:
1.
disConnECt LAthE FroM poWEr!
2.
remove the four cap screws that secure the
gap to the bed (see figure 134).
preload set screw
dowel
pin
Cap
screws
figure 134. gap retaining fasteners.
3.
tighten the dowel-pin jack nuts (see figure
134) to draw the pins from the gap.
-78-
4.
Loosen the preload set screw (see figure
134) a few turns until it no longer contacts the
headstock.
5.
tap the outside of the gap piece with a dead
blow hammer to loosen it, and, with the help
of another person, remove the gap piece.
To re-install the gap:
1.
Clean all mating surfaces completely with
mineral spirits and 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 the pores of the freshly
cleaned gap surfaces. next, place the gap in
position on the lathe bed.
Qty
3.
Back off the threaded dowel pin jam nuts until
they are flush with the end of the pins, and
drop the pins into the pin holes in the gap.
4.
Jostle the gap closer to its final alignment
until the pins seat naturally.
5.
install and lightly snug the four cap screws
in an order that will draw the gap 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 the 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 the appropri-
ate cap screws to draw-in and release certain
areas of the gap to achieve the required
alignment.
8.
When satisfied with the alignment, tap the
dowel pins the rest of the way into the gap
until they are in a fully seated position, and
thread the jack nuts down until they just con-
tact the gap.
9.
tighten the preload set screw inward until it
contacts the headstock and resistance can
be felt, then tighten it an additional
Model G0750G (Mfg. Since 11/12)
⁄
-turn.
3
4
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