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Grizzly G0709 Owner's Manual: Half Nut Adjustment; Leadscrew Endplay Adjustment

14" x 40" gunsmithing lathe.
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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 sad-
dle 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 shown
in figure 103.
set
screws
figure 103. half nut gib set screws.
4.
tighten each set screw approximately
turn, then retighten the hex nuts without mov-
ing the 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. it
should not feel too stiff or too loose.
6.
repeat Steps 3–5, if necessary, until you are
satisfied with the half nut adjustment, then re-
install the thread dial.
-64-
After a long period of time, you may find that the
leadscrew develops a bit of end play. this lathe
is designed so that play can be removed with a
simple adjustment.
Tools Needed
Qty
hex Wrench 3mm .............................................. 1
Wrench 24mm ................................................... 1
To remove leadscrew end play:
1.
2.
half nut
3.
of a
1
4.
8
5.
6.
Leadscrew Endplay
Adjustment
disConneCt lAthe FroM poWer.
Back out the leadscrew set screw approxi-
mately five turns (see figure 104).
leadscrew
leadscrew
Flange
Bearing
Cover
figure 104. leadscrew end play bearings.
un-thread the leadscrew flange bolt (figure
104), and slide the bearing cover off the end
of the leadscrew.
Clean the bearings with minerals spirits, then
dry and repack them with grade gl2 bearing
grease. re-install the bearing cover.
With your left hand, pull the leadscrew toward
the tailstock, and thread the leadscrew flange
bolt back on until it is finger tight and no
leadscrew end play exists.
hold the leadscrew flange bolt with the 24mm
wrench, and tighten the set screw until it is
snug at the bottom of its bore.
Model G0709 (Mfg. Since 5/11)
Qty
Bolt
set screw

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