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10. Drive Belt Adjustment & Speed Change
CAUTION!
Before carrying out any adjustments or
maintenance ensure that the machine is isolated and
disconnected from the electricity supply.
Adjusting the Drive Belt Tension
Use the belt tensioning handle (Fig. 10.1, A) to adjust the
tension of the drive belt. Rotate the handle anti-clockwise
to increase the tension and clockwise to decrease tension.
As a guide the belt is adequately tensioned when using
the index finger to impart reasonable pressure on the
belt - the belt should not deflect more than 1/4”. But like
tensioning a bandsaw blade this is very subjective and the
best test is in operation, if the belt isn’t slipping or wearing
excessively and there is adequate power being applied to
the bandwheels then the drive belt is tensioned correctly.
Fig. 10.1
A
Changing the Blade Speed
The BS12 has two blade speeds 820 m/min for wood and
380 m/min for some plastics and acrylics. This machine is
not suitable for cutting metals.
The lower bandwheel has two, integral, multi vee form
pulleys and the motor shaft has a twin multi vee
form pulley.
The vee belt (Fig. 10.2, A) passes around the bandwheel
pulley, the motor pulley (Fig. 10.2, B) and the plain tension
roller (Fig. 10.2, C). The belt tension is released and applied
by using the crank handle, this moves the tension roller
and allows the speed to be changed.
High Speed 802 m/min
For high speed the belt should be fitted to the rear pulley
on both the motor and bandwheel.
Lower Speed 372 m/min
For low speed the belt should be fitted to the front pulley
on both the motor and bandwheel.
Fig. 10.2
A
B
C
