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The risk of incorrect angles and
different cutter lengths cannot be
excluded when a chain is
sharpened with a file and file holder.
Less experienced users are
therefore advised to have the chain
resharpened accurately on an
electric sharpener after it has been
filed about five times.
3.18.3 Checking Depth Gauge
It is necessary to check the depth
gauge setting every time the cutters
are resharpened. A special filing
gauge is available for each chain
pitch which enables all important
angles and settings to be checked.
The depth gauge setting (a)
determines the height at which the
cutter enters the wood and thus the
thickness of the chip removed.
Depth gauge settings ("a") vary
according to chain pitch:
Chain pitch
Depth gauge
setting "a"
inch
(mm)
mm
(inch)
1/4 P (6.35)
0.45
(0.018)
1/4
(6.35)
0.65
(0.026)
3/8 P (9.32)
0.65
(0.026)
.325
(8.25)
0.65
(0.026)
3/8
(9.32)
0.65
(0.026)
.404
(10.26) 0.80
(0.031)
Chain and Bar Manual
1
Use a filing gauge (1) that matches
the chain pitch and place it on the
chain. If the depth gauge projects
from the filing gauge (arrow), the
depth gauge has to be lowered.
Lowering depth gauges
a
Use a flat or triangular file to file
down the depth gauge until it is level
with filing gauge.
The depth gauge setting may be
increased by up to 0.2 mm for
cutting soft wood in mild weather
conditions – no frost. To do this,
take one to two additional file
strokes off the prescribed
dimension – use filing gauge of the
next size up, e.g. 0.80 mm instead
of 0.65 mm
When all depth gauges are level, file
the top of the depth gauge parallel
to the stamped service marking
(see arrow), but do not lower the
highest point of the depth gauge in
this process.
The kickback tendency of the
chainsaw is increased if the depth
gauges are too low.
Place the filing gauge on the chain –
the highest point of the depth gauge
must be level with the filing gauge.
On chains with humped drive links,
lower the upper part of the humped
drive link (with service marking)
along with the depth gauge. The
other parts of the humped drive link
must not be filed since this may
increase the kickback tendency of
the chainsaw.
33
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