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Sharpening the saw chain
An incorrectly sharpened saw
chain increases the danger of
spring-back!
Use cut-protection gloves when
you are handling the chain or the
chain bar.
A sharp chain guarantees an op-
timal cutting performance. It eats
effortlessly through the wood and
leaves large, long wooden chips.
A saw chain is blunt if you have to
press the cutting equipment through
the wood and the wooden chips
are very small. In the case of a very
blunt saw chain, no chip cuttings
result at all, only sawdust.
•
The sawing parts of the chain are
the cutting elements, which consist
of a cutting tooth and a depth limiting
projection. The vertical separation dis-
tance between these two determines
the sharpness depth.
•
The following values must be noted in
sharpening the cutting teeth:
- Sharp edge angle (30°)
T
- Breast angle (85°)
- Sharpness depth (0.65 mm)
- Round file diameter (4.0 mm)
Deviations from the measure-
ment data of the cutting geom-
etry can lead to an increase of
the spring-back slope of the
machine. Increased danger of
accident!
Special tools are necessary for sharpening
the chain, which guarantee that the cutting
edges are sharpened at the correct angle
and to the correct depth. For the inexperi-
90
enced user of chainsaws, we recommend
to have the saw chain sharpened by a
specialist or a specialist workshop. If you
think yourself capable of sharpening the
chain, you can acquire the special tools in
the specialist trade.
1. Remove the saw chain (refer
U
to the section on operating
the saw). The chain should be
well-tensioned to ensure proper
sharpening.
2. For the sharpening, a round file
with 4.0 mm diameter is neces-
sary.
Other diameters damage the
chain and can lead to danger
during work!
3. Sharpen only from the inside to
the outside. Guide the file from
the inner side of the cutting teeth
to the outer side. Lift the file
when you are withdrawing it.
4. Sharpen first the teeth on one
side. Turn the saw around and
sharpen the teeth of the other side.
5. The chain is worn and must be
replaced by a new saw chain if
only approx. 4 mm of the cutting
teeth is remaining.
6. After the sharpening, all cutting
elements must now be equal in
length and width.
7. After every third sharpening, the
sharpness depth (depth limita-
tion) must be checked and the
height filed with the aid of a flat
file. The depth limitation should be
set back about 0.65 mm from the
cutting tooth. After the setting
back of depth limitation, round it
off a little at the front.
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