17
Fig. 6.9
Fig. 6.10
Fig. 6.11
Crank handle
CAUTION!
Before carrying out any adjustments or maintenance ensure
that the machine is isolated and disconnected from the
electricity supply.
6.4 Adjusting the drive belt tension
Use the crank handle, Fig. 6.9 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 then the drive belt is tensioned correctly.
6.5 Changing the Blade Speed
The BS400 has two blade speeds 820 m/min for wood and 480 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. 6.9.
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, Fig. 6.10.
Lower Speed 480 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, Fig. 6.11.
After any adjustment of the belt ensure the poly vees are correctly
located in the vee slots as failure to do so could damaged the belt
in use.
6. Adjustment of Guides & Further Operations - cont.
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