20
PROTRACTOR. Without it, you are blind and will never be able to
articulate a band saw blade. Without a protractor, you are assuming
the hook angles are right. I have analyzed over 4,000 band saw
blades since 1992. Over half of the problems, were due to
assuming the hook angle was right on. We have in stock precision
Starrett
®
band saw blade protractors,
at our cost. You must have
one.
It's mandatory!
GULLET PROCEDURE SHARPENING
THERE IS ONLY ONE WAY TO SHARPEN A BAND SAW
BLADE. A stone must come down the face of the tooth, around
the bottom of the gullet and up the back side of the tooth in ONE
SWEEPING ACTION. You
MUST
maintain gullet integrity.
The gullet is NOT a trash can or dumpster for the saw dust. In
fact, it is the second hardest working part of the band. A well
defined gullet is like the inverted wing of an aircraft. It is
responsible for the forced air flow, cooling the steel and removal
of the saw dust.
If you are running appropriate set, the air is driven through the
log by the gullet at the speed of the band. This causes the saw
dust to be sucked out of the cut. The saw dust effectively cools
the gullet by spinning around the inside and spilling over the
back side of the next tooth. You
MUST
maintain a 40% gullet fill
for proper cooling and extended cutting time.
If you sharpen just the face and the back side of the tooth, you
ruin the gullet integrity and destroy the performance of the band.
THERE ARE 4 PARTS TO A BAND SAW BLADE
AND THE IMPORTANCE OF EACH PART IS:
THE STEEL--The steel is the hardest working part. Less expensive
brittle steel not only welds harder but must be highly tensioned,
thus decreasing overall run time no matter what you do.
THE GULLET--The gullet is the second hardest working part of the
band. It is the highway for proper air flow, causing the cooling of the
band and chip removal.
THE TIP OF THE TOOTH--The tip of the tooth is the third most
important, and we all know what that does. By the way, always
keep a 10 degree hook angle. NO more, NO less for good general
sawing. Very hard, frozen or knotty wood uses an 8 degree hook
angle. These values bring the whole science of band saw blade
physics and the ART of sawing together. On our videotape, there is
a 40 minute segment dedicated on how to correctly sharpen a
Summary of Contents for MM 16
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