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NOTE: If a knife is blued or
burned, it is useless.
NOTE: If the knife edge is
blued or burned, the knife is
useless.
7 - 1 8
l S e r v i c e
7 . 2 G r i n d i n g o f k n i v e s
First grind the relief angle
Grind the relief angle first. Grind the relief angle until there are no uneven spots on
the knife edge.
Cool the knives when you grind them, grind slowly and make sure that
no heat is generated.
Then grind the cutting angle on the knife edge
When the relief angle has been ground and there are no uneven spots on the knife
edge, you can grind the cutting angle on the knife edge. The knife is "sharpened"
and is given a knife edge in new, fresh steel.
Cool the knives when you grind them, grind slowly and make sure that no heat is
generated.
Grinding of rotating knives
The rotating knives consist of a set of several knife pairs. Keep the complete set of
knives together, as one unit.
Balancing
The cutter in the granulator is balanced during manufacture. To retain balance in
the cutter, all the rotating knives must have exactly the same weight.
All rotating knives in a set of knives must therefore be ground exactly the same.
After grinding, the knives must all have the same weight, to within a gram.
Follow the instruction and use the grinding fixture and surface grinder with mag-
netic table, to make all the rotating knives exactly the same weight, cutting and
relief angle.
Grinding
Grind the worst knife first. The adjusting screws on the knives do not need to be
removed. The grinding fixture has cutouts for the adjusting screws.
Grind the relief angle on the worst knife first
Relief angle 55°.
• Install the knife in the fixture as shown in the
illustration, with the knive s rear lower edge in the
outer groove on the grinding fixture.
• Fix the knife, use the screws and the spherical
washers which belong to the grinding fixture.
( c o n t i n u e d )
Grind the relief angle
(continued)
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