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Tensioning Blade
Proper blade tension is essential to avoid blade
vibration, twist, or slippage on the wheels. A cor-
rectly tensioned blade provides long blade life,
straight cuts, and efficient cutting. The Model
G9743 features a blade tension indicator to assist
you with blade tensioning.
Two major signs that you do not have proper blade
tension are: 1) the blade stalls in the cut and slips
on the wheels, and 2) the blade frequently breaks.
Loosen blade tension at end of each day to
prolong blade life.
Tool Needed
Wrench or Socket 14mm ................................... 1
To tension blade:
1.
DISCONNECT MACHINE FROM POWER!
2.
Adjust upper blade guide as far left as it will
go, and move lower blade guide as far right
as it will go (see Adjusting Blade Guide
Positions on Page 37).
3.
Turn blade tension handle clockwise to ten-
sion blade or counterclockwise to loosen
blade until tension indicator is in green zone
(see Figure 45).
Blade Tension Handle
Figure 45. Blade tension components.
-32-
Qty
Blade Tension
Indicator
Note: To fine-tune blade tension, use
blade tensioning gauge like the one found
in Accessories on Page 39. Follow
instructions included with gauge and
blade manufacturer's recommendations
for blade tension.
4.
Adjust upper and lower blade guides as close
to workpiece as possible before performing
operation.
Blade Breakage
Many conditions may cause a bandsaw blade to
break. Some of these conditions are unavoidable
and are the natural result of the stresses placed
on the bandsaw; other causes of blade breakage
are avoidable.
The most common causes of avoidable blade
breakage are:
•
Faulty alignment or adjustment of the blade
guides.
•
Feeding blade through the workpiece too
fast.
•
Dull or damaged teeth.
•
Improperly tensioned blade.
•
Upper blade guide assembly set too far from
the workpiece. Adjust upper blade guide
assembly as close to workpiece as possible.
•
Using a blade with a lumpy or improperly fin-
ished braze or weld.
•
Leaving the blade tensioned when not in use.
•
Using the wrong blade pitch (TPI) for the
workpiece thickness. The general rule of
thumb is to have no fewer than three teeth
in contact with the workpiece when starting a
cut and at all times during cutting.
Model G9743 (Mfd. Since 10/23)
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