Grizzly G0740 Half Nut Adjustment, Belts, To adjust the half nut, To adjust the V-belts

Half Nut Adjustment

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.

Set

Screws

Figure 121. Half nut gib 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.

Model G0740 (Mfg. Since 11/12)

V-Belts

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).

End Gear Cover

Motor Access

Panel

Rear Access

Panel

Figure 122. End gear cover and access panels.

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