90°
IT.
cutter
heights
will be
uneven
if the
cutter
lengths
are
diffe-
rent.
If the cutters
are not all the
same
height the chain will
run roughly and eventually break.
As
it is very important to achieve uniform
cutter lengths, it
is
best to measure them with a slide caliper.
Find and shar-
pen
the
shortest cutter
first and then
use
it
as a master
for
all
the others, i.e. all
cutters must
be
filed back
to
the
same length as the master cutter.
Sharpen all the cutters
on
one side of the chain first
and then repeat the proce-
dure on
the other side.
The file must be held level for Rapid-Standard, Rapid-
Micro and Topic-Micro chain
so
that
it is
at
900
to
the
perpendicular faces of the chain links
or
the guide bar.
On
Rapid-Super and Topic-Super chains, hold the file so
that it slopes upwards
toward the
top
plate
at
10°, i.e.
the
file handle should be 10° lower than the tip of the file. If you
use your saw for cutting softwood
in mild weather condi-
tions (no frost),
you can
hold the
file horizontal (at right
angle to chain) for
resharpening. Note that a filing aid (file
holder,
filing
tool)
or electric grinder
must be used for
resharpening Super chains.
File
evenly and steadily and note that the file only shar-
pens on the forward stroke. Lift the file
off the cutter on
the backstroke. Make
sure you
do
not
touch the tie
straps
and drive links with the file.
Use
a
piece of hardwood
to
re-
move burrs from the
cutting edge.
Important: Sharpen the chain frequently and take
away
as
little
material
as
possible. Two
or
three
strokes of the file
are
usually
sufficient
to
the keep the chain sharp. Varia-
tions in angles and
the lengths of the cutters cannot be
completely avoided
during manual sharpening. For this
reason the chain should be restored to its
original condition
with
a
workshop chain sharpener (STIHL USG, STIHL FG 2)
after it
has been resharpened about five times by
hand.
51
Top: File position for
Rapid-Standard,
Rapid-Micro and
Topic-Micro
Bottom: Sharpening with file holder
File position
for
Rapid-Super
and
Topic-Super
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