Use and maintenance manual
Chipping machine BF150
33
7.2
KNIFE AND COUNTER-KNIFE SHARPENING
These chipper models are referred to as 'gravity' chippers, i.e., they are chippers in which the material
to be chipped 'falls' by gravity into the chipper opening, and is drawn in mainly by the knives. Their
sharpening is therefore crucial.
A rotor with knives that are worn and no longer sharp will make the machine much less effective, and
the material will no longer be drawn into the chipper.
ATTENTION!
Logs and branches must not be 'pushed' towards the rotor. If dragging does not
occur, sharpen/change knives.
WARNING!
It is recommended to process green wood and branches; processing dry wood
implies a much faster consumption and thus a drastic reduction in the number
of hours the knife is used.
To sharpen the knife, proceed with a grinding wheel, removing material at the same angle as present
until the edge is restored. Pay close attention to what is shown below:
-
Absolutely do not sharpen on the opposite side of the sharpening already present.
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When they are sharpened, they absolutely must not be heated, so water or cooling fluid must be
used continuously to cool them down during the operation. This is because, at high
temperatures, internal cracks can form, which weaken the material and can create breaks.
Another fundamental aspect for maximum machine performance is the adjustment of the counter-knife
and lower support counter-blade. They must always be adjusted after each sharpening or knife change,
and must be set at a distance of approximately 0.5 - 1 mm from the knives.
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To adjust the vertical counter-knife, loosen the 3 M12 screws (1), loosen the tie rod nuts (2) and
turn the counter nuts (3) by unscrewing or screwing the tie rod, to move the counter-knife away
from or closer to the rotor.
-
To adjust the lower support counter-blade, the red safety paddle (4) must be removed to gain
access to the cutting area, loosen the 3 M12 screws (5) of the counter-blade, and adjust the
distance to the knives with the shims supplied with the machine.
After each adjustment, check that there is no interference by slowly turning the rotor.
