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-80-
For Machines Mfg. Since 7/09
Model SB1016/SB1036
SERVICE
Half Nut Adjustment
The half nut mechanism can be tightened if it
becomes loose from wear. The pressure exerted
by the half nut is controlled by a gib. The half
nut gib is adjusted with two set screws.
Tool Needed: Qty
Hex Wrench 3mm .................................................1
To adjust the half nut gib:
1. Disengage the half nut.
2. Remove the thread dial.
3. Turn the half-nut adjustment set
screws, shown in Figure 144, clockwise
approximately an
1
⁄8-turn.
Figure 144. Half nut gib adjustment.
Leadscrew
Half Nut
Half Nut
Adjustment
Screws
4. Engage/disengage the half nut several times
and notice how it feels (you may need to
move the carriage handwheel slightly to get
the half nut to close).
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.
5. Repeat Steps 3–4, if necessary, until you are
satisfied with the half nut adjustment. (If
the half nut becomes too stiff, turn the set
screws counterclockwise to loosen it.)
6. Re-install the thread dial.
Tailstock Gib
When the tailstock is offset, it slides along
a dovetailed way that has a gib installed
between the upper and lower tailstock halves.
To maintain alignment and prevent the upper
portion of the tailstock from tilting off-center
when the tailstock is clamped to the ways, the
gib must be fairly snug.
Tools Needed: Qty
Standard Screwdriver #3 ......................................1
Wrench 28mm .......................................................1
To adjust the tailstock gib:
1. Loosen the front and rear lock bolts (see
Figure 143), and unlock the tailstock from
the bed.
Front Gib Screw
Figure 143. One of two tailstock gib screws.
Front
Lock
Bolt
Rear
Lock
Bolt
2. To tighten the tailstock gib and move it
toward the splash guard, loosen the splash
guard-facing gib screw
1
⁄4-turn, and tighten
the front gib screw shown in Figure 143
1
⁄4-
turn.
3. When finished, retighten the lock bolts.