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Model G0740 (Mfg. Since 11/12)
-79-
The clamping pressure of the half nut is fully
adjustable with a gib that can be loosened or tight-
ened by two set screws. Use this procedure to
adjust the half nut if it becomes loose from wear,
or it is too tight for your preferences. A half nut that
is too loose will make it difficult to produce accu-
rate work. A half nut that is too tight will increase
the rate of wear on itself and the leadscrew.
Tool Needed: Qty
Hex Wrench 3mm .............................................. 1
To adjust the half nut:
1. DISCONNECT LATHE FROM POWER!
2. Disengage the half nut, then remove the
thread dial.
3. Turn the two set screws (see Figure 121)
clockwise to tighten the half nut and counter-
clockwise to loosen it. Make sure to turn the
set screws in even amounts so that one end
of the gib does not become tighter than the
other.
V-belts stretch and wear with use, so check the
tension on a monthly basis to ensure optimal
power transmission. Replace all of the V-belts as
a matched set if any of them show signs of glaz-
ing, fraying, or cracking.
Tools Needed: Qty
Phillips Screwdriver #2 ...................................... 1
Open End Wrench 24mm .................................. 1
To adjust the V-belts:
1. DISCONNECT LATHE FROM POWER!
2. Remove the end gear cover, the motor
access panel, and the rear access panel to
expose the V-belts, pulleys, and motor (see
Figure 122).
V-BeltsHalf Nut Adjustment
4. Engage/disengage the half nut several times
and notice how it feels. The half nut is cor-
rectly adjusted when it has a slight drag while
opening and closing. The movement should
not be too stiff or too sloppy.
5. Repeat Steps 3–4, if necessary, until you are
satisfied with the half nut pressure.
6. Re-install the thread dial.
Figure 121. Half nut gib adjustment.
Set
Screws
Figure 122. End gear cover and access panels.
Motor Access
Panel
Rear Access
Panel
End Gear Cover