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The fence should be aligned with the table slots along
its length (see Figure 29).
Figure 29 - Fence Adjustment
ADJUSTING
THE RIP FENCE GUIDE SCALE
•
To adjust the rip fence scale loosen the four wing
screws below the table and move the scale and the
guide rail sideways to adjust. Re-tighten the wing
screws when the adjustment is correct (see Figure 30).
Figure 30 - Rip Fence Scale
The adjustment may be checked by setting the rip
fence to a thickness and cutting a test piece. When the
adjustment is correct the thickness of the test piece will
correspond with the rip fence scale setting.
CHANGING
THE BLADE SPEED
This band saw has two blade speeds; 1450 feet/min for
hardwoods, some plastics and certain nonferrous met-
als and 3000 feet/min, for all other timber.
The lower bandwheel has two, integral, multi-vee form
pulleys and the motor shaft has a twin multi-vee form
pulley.
The drive belt passes around the bandwheel pulley, the
motor pulley and the tension wheel. The belt tension is
released and applied by using the cranked handle. This
moves the tension wheel and allows the speed to be
changed (see Figure 31).
Bandwheel Pulley
Crank Handle
Motor Pulley
Figure 31 - Changing the Blade Speed
Before changing the speed always make sure the
machine has been unplugged from the electrical supply.
For the high speed 3000 ft/min, the belt should be fitted
to the rear pulley on both the motor and bandwheel
(see Figure 32).
Figure 32 - Changing the Blade Speed
For the low speed 1450 ft/min, the belt should be fitted
to the front pulley on both the motor and bandwheel
(see Figure 33).
Figure 33 - Changing the Blade Speed
BLADE
SELECTION
•
Blades vary depending on type of material, size of
workpiece and type of cut that is being performed.
•
Characteristics
which make blades different are
width, thickness and pitch.
BLADE WIDTH
•
Width of blade describes distance from tip of a tooth
to back of blade.
•
Width of blade affects rigidity of blade. A wider blade
wanders less and produces a straighter cut.
•
Width of blade also limits the smallest radius which can
be cut. A 1_,, wide blade can cut about a 1/_" radius.
BLADE THICKNESS
•
Blade thickness describes the distance between
sides of blade. A thicker blade has more rigidity and
stronger teeth.
•
A narrow thick blade is used to cut curves while a
wide thin blade is used to make long, straight cuts.
BLADE
PITCH
•
Pitch describes number of teeth per inch or tooth
size. A blade with more teeth per inch produces a
smoother cut.
11
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