23
0.177” (4.5mm)
Round File
Filing Direction
Sharpening
Angle:30°
Left Hand
Cutters
Right Hand
Cutters
LESS THAN 30° MORE THAN 30°
CORRECT INCORRECT INCORRECT
TOP PLATE SHARPENING ANGLES
Cutter tooth
WARNING:A dull or improperly sharp-
ened chain can cause excessive motor
speed during cutting, which may result
in severe motor damage.
WARNING: Improper chain sharpening
increases the potential of kickback.
WARNING: Failure to replace or repair
a damaged chain can cause serious injury.
6. Keep a correct sharpening angle of 30° between
-
ening saw chains by hand. File holders have mark-
ings for the sharpening angle.
steel on each return stroke.
left hand cutters in one direction. Then move to the
-
(Fig. 31).
Top Plate Sharpening Angles
Side Plate Angle (Fig. 33)
CORRECT 30°- This optimal angle can be
setting are used. File holders are marked with
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.
CORRECT 55°- The optimal angle can be pro-
HOOK- “Grabs” and dulls quickly. Increases
potential of KICKBACK. Results from using a
held too low.
BACKWARD SLOPE- Needs too much feed
pressure, causes excessive wear to bar and
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