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-53-
W1770 21" Bandsaw w/Foot Brake
SERVICE
— If the wheels are coplanar (Figure 75, A), the
straightedge will evenly touch the top and bottom
of both wheels.
— If the wheels are not coplanar (Figure 75, B),
place the straightedge on the lower wheel first
(ensuring that it touches both the top and bottom
rim), then adjust the upper wheel tracking knob to
make the upper wheel coplanar and parallel with
the lower wheel.
— If the straightedge does not touch both wheels
evenly, the lower wheel needs to be adjusted
(Figure 75, C) or the upper wheel needs to be
shimmed (Figure 75, D).
Shimming Upper Wheel
1. DISCONNECT BANDSAW FROM POWER!
2. Make sure the top wheel is adjusted parallel with
the bottom wheel.
3. With a straightedge touching both points of the
wheel that does not need to be adjusted, measure
the distance away from the wheel that is out of
adjustment (see Figure 76).
4. Remove the blade from the saw, then remove the
wheel that needs to be shimmed.
5. Determine how many shim washers you need to com-
pensate for the distance measured in Step 3 and
place them on the wheel shaft.
6. Replace the wheel, the original washers, the secur-
ing screw, and the blade.
7. Tighten the blade, then check the wheels with the
coplanarity gauge. (Wheel coplanarity changes as the
blade is tightened, so it is best to check the wheel
alignment when the blade is tensioned as it would
be for normal operations.)
8. When the wheels are coplanar, place a mark on each
wheel where you held the straightedge. This assures
repeated accuracy every time you adjust your
wheels.
Note: When wheels are properly coplanar, the blade
may not be centered on the crown of the wheel, but
it will be balanced.
Coplanar
Parallel, Not
Coplanar
Not Coplanar
Gauge
Contacts Top
And Bottom of
Both Wheels
Gauge Only
Contacts Bottom
Wheel
Gauge Only
Contacts Bottom
Wheel. Top Wheel
Needs to Be Tilted.
Gauge Contacts
Wheels Unvenly
Coplanarity Gauge
Solution:
Shim Upper
Wheel Out
Not Parallel
Not Coplanar
Solution:
Adjust
Lower
Wheel
Hub
Solution:
Adjust
Tracking
Knob
A
D
C
B
Figure 75. Coplanar diagram.
Figure 76. Determining distance needed to
shim upper wheel.
Difference
Between Wheels
Wheel Out of
Adjustment