16
8.12 Overview: Bearing adjustments
Thrust (back support) bearings are located behind
the saw blade and provide support to the back of
the blade when the saw is in operation.
Guide bearings are located on either side of the
saw blade and provide stability for the blade when
the saw is in operation. These bearings rotate on
an eccentric shaft so the distance from the blade
can be adjusted for optimal performance.
8.13 Upper blade guides
The bearing guides should be set so that contact
between blade and guides will occur only when
blade is under pressure from a workpiece. To
adjust upper bearing guides for proper blade
control, proceed as follows.
Refer to Figures 23 through 25.
1. Disconnect machine from power source.
2. Blade must already be tensioned and tracking
correctly. Place tension handle in “Full
Tension” position.
3. Lower guide post until upper guide bearings
are a few inches off table. (The reason for this
will be evident later in section 8.17)
4. Loosen lock knob (A, Figure 23).
Figure 23
Figure 24
5. Slide entire guide bracket until front of guide
bearings are about 0.015” (1/64”) behind the
blade’s gullet (curved area at base of tooth).
See Figure 24.
Figure 25
6. Tighten lock knob (A) to secure this position.
7. Loosen lock knob (B) for either of the front
guide bearings.
8. The guide bearing rotates on an eccentric
shaft. Adjust guide bearing by rotating the
knurled knob (C) until guide bearing is
approximately 0.004” from blade. A quick way
to achieve this spacing is by placing a single
thickness of a crisp dollar bill (a dollar bill is
approximately 0.004” thick) between blade and
guide bearing. Adjust guide bearing until it just
lightly grips the dollar bill.
NOTE: Do not force guide bearing against side
of blade. It should generally only make contact
with blade when there is pressure from the
cutting operation.
9. Tighten lock knob (B).
10. Repeat process for opposite guide bearing.
8.14 Upper thrust bearing
Refer to Figure 24.
The thrust bearing prevents backward deflection of
blade during cutting. A groove in the bearing
surface helps stabilize the moving blade.
1. Loosen lock knob (D) and rotate knob (E) to
move thrust bearing (F) up to back of blade.
2. Adjust thrust bearing until space between
groove bottom and back edge of blade is
approximately 0.015” (1/64”). Tighten lock
knob (D).
3. If lateral adjustment of bearing is needed to
align groove with blade, loosen set screw (G)
at front of bearing assembly, and shift bearing
as needed. Retighten set screw.
4. Make sure all lock knobs on upper guide
bearing assembly are tightened when
adjustments are finished.
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