64
English
• Avoid grinding at the same location for a long period of time. This will
prevent local discolouration of the blades, which indicates overhea-
ting and a modification to the actual structure of the material (and its
hardness) at that point.
• It is essential that you do not change the cutting angle of the blade as
you are sharpening it.
(3: badly-sharpened blade)
• Failure to maintain the cutting angle by blunting the angle
(4)
or changing it in any other way
(5)
will cause the blades to become stuck while cutting wood, leading to a less powerful
machine. A cutting angle that is too sharp
(6, 7)
will lead to weaker cutting edges, which will
considerably reduce the duration of the blades
(see figures 4, 5, 6 and 7)
.
• Never grind the backside of a blade.
• The tip of a blade is subjected to the heaviest use during shred-
ding. As such, sharpening the tip should only be done when strictly
necessary to avoid weakening it.
• Each time a blade is sharpened, a bit of material is lost, reducing the
active cutting edge. You can grind the cutting edge until you have
reached halfway through the width of the tip of the blade. If you go
beyond this limit, you could compromise the duration of the cutting
edge that has not been used yet. If this happens, you should turn
the blade. (see Section 11.5.3, page 64)
• If the tip of a blade is rounded, shredding efficiency will be reduced.
In that case, continued sharpening serves no purpose. This would
mean that you need to either turn or replace the blade. (see Section
11.5.3, page 64)
• After you have finished sharpening the blades, carefully close the
shredding chamber. (see Section 11.3.4, page 53)
11.5.3. Turning or replacing the blades
If blades are sharpened at regular intervals, a duration in excess of 100 hours for each cutting
edge can be obtained. Once one cutting edge has been worn down, a blade can be turned. This
new cutting edge can also be used for 100 hours. Once both blade edges have been worn down,
the blade itself will have to be replaced.
3
(4)
(5)
(6)
(7)
Summary of Contents for Prof 6
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Page 91: ...91 English ...
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