Adjusting Half-Nut - Grizzly G9249 Owner's Manual

Adjusting Half-Nut

the half-nut should engage the leadscrew firmly
without tilting from side-to-side during operation.
With normal wear over an extended period of use
of the half-nut, adjustment of the half-nut guide
bar may be necessary.
the goal of adjusting the half-nut guide bar is
remove excessive play so that the half-nut eas-
ily and firmly engages the leadscrew, but will not
tilt from side-to-side when the carriage is moved
back and forth.
Tools Needed
hex Wrench 3mm .............................................. 1
hex Wrench 5mm .............................................. 1
To adjust the half-nut guide bar:
1. disConneCt lAthe FroM poWer!
2. unscrew the cap screw shown in figure 107
and remove the thread dial assembly.
half-nut lever
thread dial
Assembly
figure 107. thread dial and cap screw.
-62-
3.
Qty
4.
5.
6.
7.
Cap screw
loosen the two set screws shown in figure
108 one full turn.
set
screws
figure 108. half-nut guide bar set screws.
use the half-nut lever to engage the half-nut
with the leadscrew, then rotate the carriage
handwheel back and forth.
Note: During this step, observe how the half-
nut tilts from side-to-side on the leadscrew.
evenly tighten the set screws until a slight
resistance is felt.
repeat Steps 4–5 until the set screws are
just snug—do not overtighten them.
re-install the thread dial.
g9249 12" x 37" Belt drive gap Bed lathe
half-nut