W1770 21" Bandsaw w/Foot Brake
—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.
A
Coplanar
Gauge |
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Gauge | |||
Coplanarity | |||
Contacts Top | |||
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| And Bottom of | ||
| Both Wheels | ||
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C
Not Parallel
Not Coplanar
Gauge Contacts
Wheels Unvenly
Solution:
Adjust
Lower
Wheel
Hub
B
Not Coplanar
Solution:
Adjust
Tracking
Knob
Gauge Only Contacts Bottom Wheel. Top Wheel Needs to Be Tilted.
D
Parallel, Not
Coplanar
Solution:
Shim Upper
Wheel Out
Gauge Only
Contacts Bottom
Wheel
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.
Figure 75. Coplanar diagram.
Difference | SERVICE |
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Between Wheels |
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Wheel Out of |
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Adjustment |
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