Makita DUC305 Instruction Manual page 16

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► 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 25AP : 0.65 mm (0.025")
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— The sharpening angle of 30° must be the same on all cut-
ters. 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 sharp-
ening angle is kept against the teeth.
• Chain blade 90PX : 55°
• Chain blade 91PX : 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 25AP : 4.0 mm (5/32")
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16 ENGLISH
— 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.
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► 1. File 2. Saw chain
— The file can be guided more easily if a file holder
(optional accessory) is employed. The file holder has
markings for the correct sharpening angle of 30° (align
the markings parallel to the saw chain) and limits the
depth of penetration (to 4/5 of the file diameter).
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► 1. File holder
— After sharpening the chain, check the height of the depth
gauge using the chain gauge tool (optional accessory).
— Remove any projecting material, however small,
with a special flat file (optional accessory).
— Round off the front of the depth gauge again.
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