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TOP-PLATE SHARPENING
ANGLES (FIG . 13)
CORRECT 30°- This optimal angle can be
obtained only when the specified files and
proper setting are used. File holders are
marked with guide marks to align the file
properly to produce the correct top plate angle.
LESS THAN 30°- The tooth is too dull for
cutting.
MORE THAN 30°- The edge of the cutting
tooth is feathered and dulls quickly.
SIDE-PLATE ANGLE (FIG . 14)
CORRECT 60° - The optimal angle can be
produced automatically if the correct diameter
file is used in the file holder.
HOOK - "Grabs" and dulls quickly. Increases
potential of KICKBACK. Results from using a
file with a diameter that is too small, or a file
held too low.
BACKWARD SLOPE - Requires too much feed
pressure, causes excessive wear to bar and
chain. Results from using a file with a diameter
too large, or a file held too high.
22
Fig . 13
Top Plate Sharpening Angles
Less
than 30°
30°
Correct
Incorrect
Fig . 14
Side Plate Angle
Hook
60°
Correct
Incorrect
More
than 30°
Incorrect
Backward
Slope
Incorrect
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