20
Fig.7.1
Fig.7.2
Fig.7.3
7. Drive Belt Adjustment & Speed Change
CRANK HANDLE
7.1 Adjusting the drive belt tension
Use the crank handle
(See Fig.7.1)
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.
7.2 Changing the Blade Speed
The BS350 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 passes around the bandwheel pulley, the motor pulley and
the plain tension roller. The belt tension is released and applied by using
the crank handle, this moves the tension roller and allows the speed to be
changed
(See Fig.7.1)
.
High Speed 820 m/min
Before changing the speed always make sure the machine has been
isolated from the mains supply. For the high speed the belt should be fitted
to the rear pulley on both the motor and bandwheel.
(See Fig.7.2).
Lower Speed 380 m/min
Before changing the speed always make sure the machine has been
isolated from the mains supply. For the low speed the belt should be fitted
to the front pulley on both the motor and bandwheel
(See Fig.7.3).
Note:
After any adjustment of the belt, ensure the poly vees are
correctly located in the vee slots, as failure to do so could damage the
belt in use.
CAUTION!
Before carrying out any adjustments or maintenance ensure
that the machine is isolated and disconnected from the
electricity supply.
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Summary of Contents for BS350S
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