S E R V I C E | For Machines Mfg. Since 3/11 |
Half Nut Adjustment
The clamping pressure of the half nut is fully adjustable with a gib that can be loosened or tightened 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 accurate work. A half nut that is too tight will increase the rate of wear on itself and the leadscrew.
V-Belts
Tools Needed: | Qty |
Phillips Screwdriver #2 | 1 |
Open End Wrench 24mm | 1 |
Tool Needed: | Qty |
Hex Wrench 3mm | .................................................. 1 |
To adjust the half nut:
1.Disengage the half nut, then remove the thread dial.
2.Turn the two set screws (see Figure 119) clockwise to tighten the half nut and counterclockwise 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
To adjust the V-belts:
1.DISCONNECT LATHE FROM POWER!
2.Remove the motor access covers shown in Figure 120.
Headstock
End
Access
Covers
Figure 120. Locations of motor access covers.
3.Adjust the hex nuts on the motor mount bolts shown in Figure 121 to move the motor mount plate up or down and adjust the
Figure 119. Half nut gib adjustment.
3. Engage/disengage the half nut several times |
and notice how it feels. The half nut is |
correctly adjusted when it has a slight drag |
while opening and closing. The movement |
should not be too stiff or too sloppy. |
Motor Mount Bolts
Pulley
Deflection
Pulley 
4. | Repeat Steps |
| satisfied with the half nut pressure. |
5. |
Figure 121. V-belt adjustment.
4.Tighten the hex nuts against both sides of the motor mount plate to prevent it from moving out of adjustment during operation, then
