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3. While holding the beaver blade in a standing
(vertical) position, Place the round file into the tooth
at the same angle as the cutting edge of the tooth
(Figure 9). Lightly push the file across the cutting
edge and through the tooth, twisting the file a half
turn with each stroke (Figure 10).
4. Skip the next tooth (because it is facing the opposite
direction), and sharpen the following tooth and so
on. When you get back to your mark, you are finished
with ONE side of the BEAVER BLADE.
5. Turn the BEAVER BLADE around to sharpen the
other side. Change the angle of the round file to
follow the angle of the cutting edge for teeth on this
side (Figure 11). Start sharpening at your mark.
Sharpen the teeth that have not yet been touched.
Remember to pay attention to the angle of the file on
the tooth and use the same number of strokes per
tooth. Twist the file a half turn with each stroke into
the cutting edge of the tooth, and don’t bear down
on the file. Sharpen every other tooth until you get
back to your mark.
Note: A chain that is sharper on one side than it is on the
other will not cut in a straight line, but will tend to drift up
or down, consistent with the sharper side of the chain. If your
blade drifts up or down, check to see that the chain is equally
sharp on both sides.
Note: After the cutting edges are all sharp, the rakers need
to be filed down to give the teeth the proper cutting depth.
See the following procedure to complete the Beaver Blade
sharpening.
6. Hold the flat file horizontal and file down the rakers
to the suggested dimension (Figure 12).
Note: If not enough material is removed from the rakers, the
teeth will not cut efficiently. If too much material is removed
from the rakers, the teeth will cut too aggressively and cause
instability in the cutting action.
Tooth Angle
Tooth Rake
r
Figure 9
Round File
First Side
Figure 10
.025
Raker
Cutting
Edge
Figure 12
Round File
Second Side
Figure 11