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The check is performed by
positioning the filing gauge on the
chain so that one side locates
against the chain. The filing gauge
is then moved along the chain until
the cutter is in line with one edge of
the sighting window (side plate
angle or filing angle). If the cutting
edge and window edge are parallel,
the angle is correct.
3.18.7 Sharpening Errors
The specified side plate angle and
filing angle can only be obtained if
the correct tools are used (file
holder and file for manual
sharpening, or specially shaped
grinding wheels) and the correct
adjustments are made.
Every deviation affects at least one
of the fixed factors. For example, if
the file is too thin or the file holder
used sets the file too low, the side
plate and top plate cutting angles
obtained will be too narrow (too
acute). On the other hand, if the file
diameter is too large or the file is set
too high, the resultant side plate and
top plate cutting angles will be too
wide (obtuse).
Chain and Bar Manual
Incorrectly dressed grinding wheels
have a similar effect on the side
plate and top plate cutting angles.
If the file is held incorrectly or the
filing tool or sharpener are not
properly adjusted, the side plate
and top plate cutting angles and the
filing angle will vary. The top plate
cutting edge is the main cutting
edge on the cutter. Although this
angle is difficult to measure, it will
automatically be correct if the other
specified angles are maintained.
Uneven cutter lengths make the
chain run roughly, cause the
bottoms of the cutters to wear at a
high rate, cause wandering in the
cut and can result in the chain
breaking.
If the depth gauges are too low,
cutting behavior will be rough and
increase the kickback tendency of
the saw.
For effects of incorrect depth gauge
setting and filing angle see 6.1.3
and 6.1.4.
Different side plate angles
Different filing angles
Different cutter lengths
Different depth gauge settings
35
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