Half-Nut Adjustment - Grizzly G0750GV Owner's Manual

The saddle gib is located on the bottom of the
back edge of the slide (see Figure 122). This gib
is designed differently than the cross or compound
slide gibs. Instead of being a wedge-shaped plate,
it is a flat bar. The gib pressure is applied by four
set screws. Jam nuts secure these set screws in
place, so they will not loosen during operation.
Jam Nuts
Set Screws
Figure 122. Saddle gib components.
Items Needed
Open-End Wrench 10mm .................................. 1
Hex Wrench 3mm .............................................. 1
Hex Wrench 6mm .............................................. 1
To adjust saddle slide gib:
1. DISCONNECT MACHINE FROM POWER!
2. Clean and lubricate lathe bedways (refer to
Page 63 for instructions).
3. If carriage lock (see Figure 121 on Page 71)
is tight, loosen it two turns.
4. Loosen jam nuts on four set screws shown
in Figure 122, and adjust set screws same
amount as follows:
— To tighten carriage gib, tighten set screws.
— To loosen gib, loosen set screws.
5. Move carriage back and forth and repeat
adjustments as necessary until gib pressure
is acceptable.
6.
Hold set screws in place and tighten jam
nuts.
7.
Move carriage again to double-check gib
adjustment.
-72-

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.
Items Needed
Hex Wrenches 2.5, 6mm .......................... 1 Each
Open-End Wrench 8mm.................................... 1
Gib
To adjust half nut:
1.
DISCONNECT MACHINE FROM POWER!
2.
Disengage half nut and remove thread dial.
3.
Loosen hex nuts on set screws shown in
Qty
Figure 123.
Set
Screws
Figure 123. Half-nut gib set screws.
4.
Tighten each set screw approximately
then retighten hex nuts without moving set
screws.
5.
Move carriage handwheel until half nut can
fully close, then open/close half nut several
times and notice how it feels. Half nut is cor-
rectly adjusted when you feel slight drag
while opening and closing it. It should not feel
stiff or loose.
6. Repeat Steps 3–5, if necessary, until you
are satisfied with half-nut adjustment, then
re-install thread dial.
Half Nut
Model G0750GV (Mfd. Since 03/18)
Qty
⁄ turn,
1
8