South Bend Tools Oil Country Series, Owner'S Manual

Page: 55 / 68

South Bend Tools South Bend Tools
For Machines Mfd. Since 7/19 Model SB1065F–SB1071F
-53-
S E R V I C E
Leadscrew & Feed
Rod End Play
Adjustment
The leadscrew and feed rod use lubricated and
sealed bearings, and should last many years.
If for any reason replacement is required,
the bearing block shown in Figure 82 can be
removed from the lathe and slid off of the ends of
the shafts. Then the old bearings can be pulled
from the shafts and new ones installed.
Tools Needed Qty
Hex Wrenches 6, 8, 10mm ............................. 1 Ea.
Wooden Mallet ......................................................1
Figure 82. Leadscrew feed rod bearing block. Figure 82. Leadscrew feed rod bearing block.
Bearing Block Bearing Block
Sealed Sealed
Bearings Bearings
Retaining Retaining
Cap Screw Cap Screw
Half Nut Clamping
The clamping pressure of the half nut is fully
adjustable with a gib that can be loosened or
tightened by a set screw. Use this procedure to
adjust the half nut when it becomes loose from
wear, or if 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.
Tools Needed Qty
Hex Wrench 3mm .................................................1
To adjust half nut:
1.
Disengage half nut using its lever.
2. Tighten half nut adjustment set screw (see
Figure 81) in small increments until it is
snug.
3. Engage/disengage half nut several times
and notice how it feels. If lever feels difficult
to fully engage, loosen adjustment screw
slightly until halfnut allows lever to fully
engage.
Note: The goal of adjustment is to tighten the
adjustment screw until the lever has a slight
drag at the end of its travel as it clamps
around the leadscrew. If tension is felt at the
beginning of lever travel, the adjustment is
too tight and must be loosened slightly.
Figure 81. Half nut gib adjustment. Figure 81. Half nut gib adjustment.
Lever Detent Ball Lever Detent Ball
Spring Adjustment Spring Adjustment
Half Nut Half Nut
Adjustment Adjustment
Half Nut Half Nut
Lever Lever