Makita DUC256 Manual De Instrucciones página 19

Sharpening the saw chain
Sharpen the saw chain when:
• Mealy sawdust is produced when damp
wood is cut;
• The chain penetrates the wood with diffi-
culty, even when heavy pressure is applied;
• The cutting edge is obviously damaged;
• The saw pulls to the left or right in the wood.
(caused by uneven sharpening of the saw
chain or damage to one side only)
Sharpen the saw chain frequently but a little
each time. Two or three strokes with a file are
usually sufficient for routine resharpening. When
the saw chain has been resharpened several
times, have it sharpened in our authorized ser-
vice center.
Sharpening criteria:
WARNING: An excessive distance
between the cutting edge and depth gauge
increases the risk of kickback.
2
1
3
1
Fig.25
► 1. Cutter length 2. Distance between cutting
edge and depth gauge 3. Minimum cutter
length (3 mm (1/8"))
— All cutter length must be equal. Different
cutter lengths prevent the saw chain from
running smoothly and may cause the saw
chain to break.
— Do not sharpen the chain when the cutter
length has reached 3 mm (1/8") or shorter.
The chain must be replaced with new one.
— The chip thickness is determined by the
distance between the depth gauge (round
nose) and the cutting edge.
— The best cutting results are obtained with
following distance between cutting edge
and depth gauge.
• Chain blade 90PX : 0.65 mm (0.025")
• Chain blade 91PX : 0.65 mm (0.025")
• Chain blade 80TXL : 0.65 mm (0.025")
• Chain blade 25AP : 0.65 mm (0.025")
2
1
19
30
Fig.26
— The sharpening angle of 30° must be the
same on all cutters. Different cutter angles
cause the chain to run roughly and unevenly,
accelerate wear, and lead to chain breaks.
— Use a suitable round file so that the proper
sharpening angle is kept against the teeth.
• Chain blade 90PX : 55°
• Chain blade 91PX : 55°
• Chain blade 80TXL : 55°
• Chain blade 25AP : 55°
File and file guiding
— Use a special round file (optional accessory)
for saw chains to sharpen the chain. Normal
round files are not suitable.
— Diameter of the round file for each saw
chain is as follows:
• Chain blade 90PX : 4.5 mm (3/16")
• Chain blade 91PX : 4.0 mm (5/32")
• Chain blade 80TXL : 4.0 mm (5/32")
• Chain blade 25AP : 4.0 mm (5/32")
— The file should only engage the cutter on
the forward stroke. Lift the file off the cutter
on the return stroke.
— Sharpen the shortest cutter first. Then the
length of this shortest cutter becomes the
standard for all other cutters on the saw chain.
— Guide the file as shown in the figure.
1
2
Fig.27
► 1. File 2. Saw chain
ENGLISH
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