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Blade Breakage
Many conditions may cause a bandsaw blade to
break. Blade breakage is unavoidable, in some
cases, since it is the natural result of the peculiar
stresses that bandsaw blades must endure. Blade
breakage is also due to avoidable circumstances.
Avoidable blade breakage is most often the result
of poor care or judgement on the part of the
operator when mounting or adjusting the blade or
support guides.
The most common causes of blade breakage
are:
•
Faulty alignment or adjustment of the blade
guides.
•
Forcing or twisting a wide blade around a
short radius.
•
Feeding the workpiece too fast.
•
Dull or damaged teeth.
•
Over-tensioned blade.
•
Top blade guide assembly set too high above
the workpiece. Adjust the top blade guide
assembly so that there is approximately
between the bottom of the assembly and the
workpiece.
•
Using a blade with a lumpy or improperly fin-
ished braze or weld.
•
Continuously running the bandsaw when not
in use.
•
Leaving the blade tensioned when not in
use.
•
Using the wrong pitch (TPI) for the workpiece
thickness. The general rule of thumb is to
have at least three teeth in contact with the
workpiece at all times during cutting.
-22-
Blade Care &
Blade Care
A bandsaw blade is a delicate piece of steel that
is subjected to tremendous strain. A blade will last
longer if you give it fair treatment and always use
the appropriate feed rate for your operation.
Be sure to select blades with the proper width,
set, type, and pitch for each application. Using the
wrong blade often produces unnecessary heat
and shortens the life of the blade.
A clean blade performs much better than a dirty
blade. Dirty or gummed up blades pass through
the cutting material with much more resistance
than clean blades. This extra resistance also
causes unnecessary heat.
Blade Break-In
The sharp teeth tips and edges of a new blade are
extremely sharp, and cutting at too fast of a feed
rate may fracture the beveled edges of the teeth
and cause premature blade wear.
To properly break-in a new blade:
⁄
"
1
4
1.
Choose the correct speed for the blade and
material of the operation.
2.
Reduce the feed pressure by half for the first
50–100 in
3.
To avoid twisting the blade when cutting,
reduce the feed pressure when the total width
of the blade is in the cut.
4.
Use the Chip Inspection Chart on Page 23
to check the blade efficiency.
G0668 20" Vertical Metal-Cutting Bandsaw
Break-In
of material cut.
2
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