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English
11.5 Maintenance of the machine
11.5.1 Routine check of the blades
Sharp shred knives will give the machine optimum performance and provide maximum operating speed.
Enhance your own work comfort by taking some time to check the blades, and if necessary, sharpen them.
SHARP BLADES = OPTIMUM PERFORMANCE
Pay particular attention to the following:
Shredding garden waste with the ELIET shredding system
takes place in two steps. We fi rst have the contact of the
blades with the garden waste when chopping takes place
where the cutting block can be found. The wood and green
material is roughly cut into pieces until large irregular chip-
pings are obtained during this
primary shredding (1)
. These
large chippings end up in the shredding chamber where
they are fi nely chopped to produce small chippings. This
secondary shredding (2)
will continue until the chippings
are considered to be small enough to pass through the
openings in the sieve screen.
Each of these shredding actions set certain criteria that the
blades must meet for an optimal shredding effi ciency:
A)The top of the blade, in particular, is important with regard
to the primary shredding. Since the blades act as splitting
blades, the
cutting angle
is essential because this forms
the key that will cleave through the wood. The cutting angle
of the cutting edge of the blade is by preference 30°. The
sharper the blade edge, the less resistance when splitting
and the smaller the cutting impact on the structure. This will
produce signifi cantly fewer vibrations and noise. This will also
benefi t the load on the blade shaft and the bearings. You can
ensure that the cutting angle is the best possible at all times
by regularly grinding. (See 11.3.3, Sharpening the blades.)
On the other hand, the form of the top of the blade is of
essential importance for the performance and the speed of
this primary shredding. The angle of the
top of the blade
will determine the angle at which the wood is pulled inside
the shredding chamber. If this angle is rounded off due to
wear, turn the blades around or replace them. (See § 11.5.3.1
Reversing and replacing the blades.)