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SHARPENING
AND
JOINTING
Sharpening
Tighten
chain firmly
on
the
cutter bar to hold
secure.
When
sharpening
take
a firm
grip on the
file
and
use
it
with
a steady thrust.
Don't swing
the file
during
the stroke.
Keep
consistent
cutting angles (minimum
35°) on all teeth
(figure
15).
Make
certain
the
file is also bearing against
the
top
cutting face.
Keeping one
fifth
of
the
diameter of the
file above
the
top
cutting
edge
of the tooth
will
give a nice hollow
ground
cutting edge
which
will
cut fast and
dull
slowly. Don't
file off
any more
metal
than
necessary to give
a sharp
cutting
edge.
Make sure
your
file
is
really
sharp
because
the
chain teeth
'are made
of a
heat
treated
steel
alloy.
Also, a
dull
file
can
surface
harden
the
cutter
edges
and
make
them
extremely-
hard
to
sharpen.
Use only a
sharp
14
inch full round
file.
Be
careful
to keep
the cutting
teeth
the same
length.
If
the
teeth
are
not uniform, the
longer
ones
will
take
a
deeper bite
and
cause the saw to
cut in an
arc.
When you
have
finished
sharpening
the chain,
slack off
the
chain
slightly
and
run it
free while
oiling it
heavily to
make sure that
all
filings are
flushed
from the
cutter
bar
groove.
Be sure to
re-tension
chain
correctly.
Chain Tension
The
importance
of
correct
chain
tension
cannot be
overstressed,
Check
the
instruc-
tions given
under
General
Instructions
carefully.
P
ARTICULAR
CARE
must be
used
to properly
break
in
a new
Chain.
Correct
chain
tension
is
especially
important
on bar
lengths
of
32 inches
and
over,
to
prevent"
the
chain jumping
the
bar and
causing
damage
to
the
equipment
and
loss
of
time
to
the
operator.
When
the
chain
is
correctly
filed,
properly
lubricated,
correctly
jointed and
proper
chain tension
maintained,
it
will
cut
smoothly
and
be
easier on
the motor,
bar,
chain
and the
operator.
Wrong-
Hooked
9
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