13
Figure 8-7: blade guide adjustment
8.5 Blade replacement
A general-use variable-tooth blade is provided with
this band saw.
Choice of blade pitch is governed by thickness of
workpiece: the thinner the workpiece, the more
teeth advised. A minimum of 3 teeth should engage
workpiece at all times. If blade teeth are so far apart
that they straddle the work, severe damage to
workpiece and blade can result.
1. Disconnect machine from power source.
2. Raise bow to vertical position.
3. Open rear guard by removing two knobs (see
Figure 8-10).
4. Remove red guard from upper blade guide by
removing two screws.
It is essential that red blade
guard be installed after new blade has been
fitted. Failure to comply may cause serious
injury.
5. Release tension on blade by turning tension
handle (P, Figure 8-7) counterclockwise.
Remove blade. (Use gloves when handling
sharp blades).
6. Install new blade between blade guide
assemblies and around each wheel. Make sure
blade teeth are pointing in proper direction. See
Figure 8-8.
7. Increase blade tension just enough to hold
blade on wheels. Make sure back of blade rests
lightly against shoulder of both wheels. Twist
blade slightly to allow it to slip into guides.
Figure 8-8
8. Install red blade guard with screws.
9. Tension blade fully (see sect. 8.8 Blade
tension.)
10. Place two to three drops of lightweight oil on
blade.
11. Adjust blade guide bearings (see sect. 8.6
Blade guide bearings).
12. Connect machine to power source.
13. Run saw and make sure blade is tracking
properly (sect 8.9. Blade tracking.)
14. Follow blade break-in procedures (sect. 9.1).
8.6 Blade guide bearings
1. Disconnect machine from power source.
2. Loosen bolt (Q, Figure 8-9) and adjust
assembly so that rear bearing (R
1
) is
approximately 0.002 to 0.003 inches from back
of blade. Also, inside bearing (R2) should very
lightly contact blade. Tighten bolt (Q).
3. Inside bearing (R
2
) is fixed. Outside bearing (R
3
)
rotates on an eccentric shaft. Rotate nut (S)
with 14mm wrench to adjust eccentric bearing
to a clearance of 0.001 inches from blade.
4. Repeat above steps for opposite blade guide
assembly.
Figure 8-9: blade guide setting
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