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(4)
(5)
(6)
(7)
English
39
• If blades become dull, the sharp cutting edge will become worn and
will be upset to form a wider rib.
(1)
• By grinding a little metal from the cutting edge, you can again
obtain a sharp cutting edge from this wide rib.
(2)
• Sharpening is performed by moving the grinding disc along the
angled cutting edge.
• Remark: By regularly grinding, you will only have to grind away a
thin layer of the metal each time to again obtain a sharp cutting
edge. This will ensure very short grinding times and you will always
have the best possible cutting edge.
• Avoid grinding at the same location for a long period of time. In this
way you avoid local discolouration of the blades indicates heating,
resulting in a change of the material structure and decreased hard-
ness.
• It is extremely important to respect the existing cutting angle when
grinding.
(3: blade sharpened wrongly)
• When the correct cutting angle is not observed, due to grinding a
blunt angle
(4)
or an interrupted cutting angle
(5)
, the blades will
be slowed by the wood, resulting in a loss of capacity. Too sharp a
cutting angle
(6, 7)
will lead to a weakened cutting edge and conse-
quently, to a considerably shorter blade life.
• Never grind the rear side of a blade. On RESIST/6
TM
blades, the profiling
is on the rear. If you grind away the teeth, the blade will lose a great
deal of its cutting force.
• The top of the blade suffers the most during chipping. Therefore it is
best to grind them as little as possible to avoid weakening.
• At each grinding service, the active cutting edge becomes a little bit
smaller due to the removal of a small bit of the material. Blades may
be ground until half-way through the width of the blade tip. Exceeding
this limit compromises the service life of the unused cutting edge. We
recommend reversing the blades at this point (see § 11.4.3 Reversing and
replacing chipper blades).
• Rounded-off blades offer reduced chipping efficiency. In this event,
further grinding of the blade serves no purpose. This is the time to
reverse or replace the blades.
11.4.5 Checking the belt tension
Содержание Minor 4S
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