Grizzly G9249 - Manual (Page 64)

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g9249 12" x 37" Belt drive gap Bed lathe
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 Qty
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.
3. loosen the two set screws shown in figure
108 one full turn.
figure 108. half-nut guide bar set screws.
half-nut
set
screws
4. 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.
5. evenly tighten the set screws until a slight
resistance is felt.
6. repeat Steps 4–5 until the set screws are
just snug—do not overtighten them.
7. re-install the thread dial.
figure 107. thread dial and cap screw.
thread dial
Assembly
Cap screw
half-nut lever