Maintenance; Sharpening The Saw Chain - Makita DES 350 Instruction Manual

MAINTENANCE

Sharpening the saw chain

When working on the saw chain you must always pull
out the power supply plug and wear protective gloves.
A
The chain needs sharpening when:
- the sawdust from sawing humid wood looks like wood flour.
- the saw chain penetrates the wood only under great
pressure.
- the cutting edge is visibly damaged.
- the sawing device is pulled to the left or the right during the
sawing operation. The cause is an unequal sharpening of
the saw chain.
Important: Sharpen frequently, but without removing
too much metal!
Generally, 2-3 strokes of the file will be enough.
Have the chain resharpened in a service center when you
have sharpened it yourself several times.
C
- All cutters must be sharpened to the same angle, 30°.
Different angles result in a roughly, irregularly running
chain, increase wear and tear and cause chain beakage.
- The 85° front rake of the cutter results from the cut depth of
the round file. If the proper file is used in the right manner,
the correct front rake will be obtained automatically.
0.65 mm
(.025")
min.
3 mm (0.11")
B
Proper sharpening:
CAUTION:
Use only chains and guide bars designed for this saw
(see the Extract from the spare-parts list)!
- All cutters must be of the same length (dimension a).
Cutters with different lengths result in rough running of the
chain and can cause cracks in the chain.
- Minimum cutter length is 3 mm. Do not resharpen the chain
when the minimum cutter length has been reached; at this
point, the chain must be replaced (see the Extract from the
spare-parts list and "Replacing the chain").
- The depth of the cut is determined by the difference in
height between the depth limiter (round nose) and the
cutting edge.
- The best results are obtained with a depth-limiter depth of
0.65 mm (.025").
CAUTION:
Excessive depth increases the
risk of kickback!
Files and how to work with them
3/8"
D
DES 300, 350, 400
- Use a special round file for chains for sharpening the chain.
3/8"= dia. 4.0 mm, .325"= dia. 4.8 / 4.5 mm. File the first
cutter half with a 4.8 mm dia. round file, the switch to a 4.5
mm dia. file. Normal round files are not appropriate for
this work. See "Accessories" for the order number.
- The file should cut only when pushed forwards (arrow).
Lift the file when leading it backwards.
- First sharpen the shortest cutter. The length of this cutter is
then the standerd for all other cutters of the chain.
- Always guide the file as in fig. „D" shown (chain 3/8"= 90
0
and chain .325"=10 ).
0.65 mm
(.025")
.325"
DES 380
0
15