Grizzly G4000 Owner's Manual: Compound Slide Backlash; Adjusting Half-nut

9" x 19" bench lathe.
Hide thumbs
3.
Loosen the set screws and move the device
back-and-forth to make sure the gibs are
loose, then tighten the set screws just until
you feel resistance.
4.
Move the device back-and-forth and loosen
or tighten the set screws equally until you are
satisfied with the gib adjustment, then, with-
out moving the set screws, re-tighten the hex
nuts to secure the setting.
Compound Slide
Backlash
Backlash is the amount the handwheel turns in
one direction before the slide begins to move.
Note: When adjusting backlash, keep in mind the
goal is to remove excess backlash without bind-
ing the movement of the slide. Overtightening will
cause excessive wear to the cross slide leadscrew
and nut.
Tools Needed
Wrench 10mm ................................................... 1
phillips screwdriver #2 ...................................... 1
To adjust the cross slide backlash:
1.
disConnECt LAthE FroM poWEr!
2.
remove the compound slide from the cross
slide, then loosen or tighten the adjustment
screw shown in figure 85 until you are satis-
fied with the amount of backlash.
Adjustment screw
figure 85. Cross slide backlash adjustment
screw.
Model G4000 (Mfg. Since 8/09)
Adjusting Half-Nut
the leadscrew half-nut should engage the
leadscrew firmly without tilting from side-to-side
during operation. With normal wear over an
extended period of use, adjustment of the half-nut
guide bar may be necessary. the goal of adjust-
ing the half-nut guide bar is to remove excessive
play so that the half-nut easily and firmly engages
the leadscrew, but will not tilt from side-to-side
when engaged with the leadscrew for threading
operations.
Tools Needed
hex Wrench 5mm .............................................. 1
Wrench 7mm ..................................................... 1
standard screwdriver #1 ................................... 1
Qty
figure 86. half-nut adjustment components.
To adjust the half-nut guide bar:
1.
disConnECt LAthE FroM poWEr!
2.
remove the thread dial assembly.
3.
Loosen the two adjustment hex nuts shown in
figure 86, then adjust the set screws in small
increments.
4.
Engage the half-nut with the leadscrew and
rock the carriage back-and-forth with the
handwheel.
5.
repeat Steps 3–4 until you are satisfied with
the adjustment, then without moving the set
screws, re-tighten the hex nuts and re-install
the thread dial assembly.
Qty
half-nut
Adjustment
hex nuts
& set
screws
-53-

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