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14
7.12 Blade replacement
Use caution and proceed slowly
when working with or around a band saw blade.
Use work gloves when handling it.
1. Disconnect band saw from power source.
2. Remove back blade cover, and red blade
guards.
It is essential these red
guards be installed after new blade has been
fitted. Failure to comply may cause serious
injury.
3. Release tension on blade using handle (K,
Figure 7-6).
4. Remove old blade. Place new blade between
blade guide assemblies and around each
wheel. Make sure blade teeth are pointing in
proper direction (see Figure 7-8).
Figure 7-8
5. If teeth do not orient properly regardless of how
blade is positioned, turn blade inside-out.
Tension blade enough to hold in place.
6. An arrow on the bow indicates blade direction.
7. Tension blade fully (see sect. 7.9).
8. Place 2 to 3 drops of lightweight oil on blade.
9. Connect machine to power source.
10. Operate saw and make sure blade is tracking
properly (sect. 7.10.)
11. Follow blade break-in procedures, sect. 8.2.
7.13 Feed pressure adjustment
The spring (Figure 7-9) moderates downfeed
pressure of bow. Turn screw with 12mm wrench,
clockwise to decrease pressure, counterclockwise
to increase pressure.
Figure 7-9
7.14 Test cut to verify adjustment
Test cuts can be used to determine whether or not
the blade is accurately adjusted. Use 2-inch round
bar stock to perform these test cuts, as follows:
1. With bar stock securely clamped in vise, make
a cut through the bar stock. (See Figure 7-10.)
2. Mark the top of bar stock.
3. Move the bar stock about 1/4-inch past the
blade so that you can begin a second cut.
4. Rotate the bar stock 180 degrees so the mark
you made is now at bottom of cut.
5. Make a cut through the bar stock.
6. Use a micrometer to measure the thickness
variation of the disk you have cut from the bar
stock. Measure at top and bottom of disk.
The saw blade can be considered correctly adjusted
when the variation measure is no more than 0.012
inch across the face of the disk.
If you do not have a piece of 2-inch bar stock
available for a test cut, use a larger diameter test
piece rather than a smaller one. [Note: Do not
exceed material capacity of the machine – refer to
specifications.] The maximum thickness variation on
any test piece should be no more than 0.003 inch,
per side, per inch of stock diameter.
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