7:16
UGG050-0517
S Series
(A)
Ø 6 mm
(B)
(C)
6°
SER
VICE
(A) = Rotating knife segment
(B) = Length,
Cutting head, New rotating knife: 9.5 mm
(C) = Minimum length,
Cutting head, Grinded rotating knife: 4.5 mm
Knives
7. SERVICE
General rules, Grind the knives
1. Read page 7:12 “General rules, Knives”.
2. Always begin grinding the worst and most blunt
knife.
3. Grind the knives with accurate precision. Respect
specified measures.
4. Always cool the knives during grinding. Grind slowly.
Make sure that no heat is developed. Knives that are
overheated when grinded, loose their hardness,
strength and durability. Knives that have been burned
or quenched blue, are irreparable and must be
discarded.
5. A surface grinder with magnetic table and a grinding
fixture ensures that the cutting angles and the relief
angles becomes correct.
Grind the rotating knife segments
1. Read page 7:16 “General rules, Grind the knives”.
2. Grind the rotating knife. Refer to figure on the right.
Grind until all irregularities have disappeared.
3. Measure the rotating knife’s cutting head after
grinding.
Note! If the rotating knife’s cutting head is less than
4.5 mm, the rotating knife must be discarded and
replaced by a new rotating knife. (The cutting head on
a new rotating knife is 9.5 mm).
5. Repeat point 2–5 until all rotating knife segments
have been grinded.
Note! All rotating knife segments must be grinded
equally to maintain the rotor balance. All rotating
knife segments must have the same measure and
weight (within a gramme).