Half Nut Adjustment - Grizzly G9036 Owner's Manual

13" x 40" gear-head lathe
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saddle gib
the saddle is supplied with a lock bolt on the front
right-hand side of the slide (see figure 91). this
bolt locks the saddle in place for increased rigidity
when making face cuts. Before making adjust-
ments to the saddle gib, make sure that this bolt is
loose by turning it counterclockwise one full turn.
important: Do not loosen the saddle lock
bolt more than a couple turns or the components
inside will come apart. Replacing these compo-
nents is difficult and time consuming.
figure 91. location of saddle lock bolt.
the saddle gib is located on the bottom of the
back edge of the slide (figure 92). this gib is
designed differently than the cross or compound
slide gibs. instead of being a wedge-shaped plate,
it is just a flat bar. the gib tension is applied by
four set screws. hex nuts secure these set screws
in place, so they will not loosen during operation.
figure 92. saddle gib components.
to adjust the saddle gib, loosen the hex nuts and
adjust the four set screws in even increments until
an acceptable amount of resistance is felt when
turning the carriage handwheel. tighten the hex
nuts when done, but do not allow the set screws
to move when tightening.
-52-
saddle lock Bolt
gib
set screws

half nut adjustment

the half nut mechanism can be adjusted if it
becomes loose from wear. the half nut is mount-
ed in ways with a gib exerting pressure between
components to reduce sloppy movement. the half
nut gib is a flat bar-type gib, similar to the saddle
gib, and is tensioned with three set screws.
tools needed
hex Wrenches 2.5, 6mm .......................... 1 each
Wrench 8mm ..................................................... 1
to adjust the half nut:
1.
disConneCt lAthe FroM poWer!
2.
open the half nut and remove the thread
dial.
3.
loosen the hex nuts on the set screws.
4.
tighten each set screw (figure 93) in approx-
imately an
of a turn, then retighten the hex
1
8
nuts without moving the set screws.
set
screws
figure 93. half nut gib set screws.
5.
Move the carriage handwheel until the half
nut can fully close, then open/close the half
nut several times and notice how it feels.
the half nut is correctly adjusted when you
feel a slight drag while opening and closing it.
the movement should not be too stiff or too
sloppy.
6.
repeat steps 3–5, if necessary, until you are
satisfied with the half nut adjustment, then re-
install the thread dial.
Qty
half nut
Model g9036 Mfg. 7/08+

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