19
6.1 Tensioning the blade
The blade tensioning knob should be used to increase or decrease tension
(See Fig. 6.1)
. The only truly accurate way to check a blade is with a
tension meter. These are very expensive so most users may need another
method. The blade tension indicator, which is located on the back side of
the top housing of the bandsaw, should be used first as a guide to the
correct tension. We then suggest testing the tension by the amount the
blade will deflect sideways. First set the guides to 6 inches above the
table, making sure the saw is turned off push the blade sideways with a
reasonable amount of pressure using the push stick. A correctly tensioned
blade should not move more than a 1/4" sideways
(See Fig. 6.2A)
.
If the blade is over tightened, as in
Fig. 6.2B
, the blade could be damaged.
However perhaps the most tried and tested way of blade tensioning is
simply: If the bandsaw is cutting accurately then the blade is tensioned
correctly, if the blade tends to wander and an accurate cut cannot be
achieved then the blade tension needs adjusting.
If the machine is to stand idle for a period it is good practice to slacken
tension and re-tension when next using.
6.2 Tracking the Bandsaw blade
Isolate the machine from the supply by unplugging the mains plug. Set the
tracking of the blade before setting the blade guides. Once the blade is
tensioned, track the blade by turning the upper band wheel by hand and
adjusting the tracking knob
(See Fig.6.3)
. When viewed from the back
of the machine turning the tracking knob clockwise the blade will move
towards the back of the band wheel, by turning the tracking knob anti-
clockwise the blade will move to the front of the band wheel. The blade
should run as close to the centre of the band wheel as possible, as shown
(See Fig.6.4).
On narrow blades (e.g 1/4" and 3/8") it may be necessary
to run the blade to rear of the band wheel. After the blade is tracked in
the desired position on the band wheel, rotate the band wheel several
more times by hand without any further adjustment ensuring that the
blade remains in the same position. Once this has been achieved lock the
tracking knob with the winged nut
(See Fig.6.3)
.
It takes a few revolutions of the band wheel for the effect of adjustment on
the tracking knob to become apparent. To avoid over-adjusting, make small
gradual adjustments on the tracking knob and revolve the band wheel
a few times to check the alignment of the blade before making further
adjustments. The machine should then be run for a few seconds before any
adjustment of guides is carried out.
Fig.6.3
Fig.6.4
TRACKING KNOB
6. Bandsaw Blade Set Up
Fig.6.1
BLADE TENSIONING KNOB
CAUTION!
Before carrying out any adjustments or maintenance ensure
that the machine is isolated and disconnected from the
electricity supply.
BLADE TENSION INDICATOR
i
Kg
i
Kg
WINGED NUT
A
B
7
3
Fig.6.2
Summary of Contents for BS300E Premium
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