Stihl OILOMATIC Manual page 26

3.14.4 Top Plate Cutting Angle
The top plate cutting angle is the
forward slope of the top plate cutting
edge
relative to the bottom of the cutter.
Depending on the chain type, it is
50° to 60°.
The top plate cutting edge is the
main cutting edge on the cutter and
its angle is therefore the most
important of all. The top plate
cutting angle is obtained
automatically if the other specified
angles are observed.
3.14.5 Filing Angle
The filing angle is measured from a
line at right angles to the guide bar
to the top plate cutting edge.
Chain and Bar Manual
The filing angle differs on some
types of chain:
TM TM
RAPID Micro
TM
RAPID Super
TM
RAPID Duro
TM TM
PICCO Micro
TM
PICCO Super
TM
PICCO Duro
RCX, RMX, PMX (ripping
chains)
Different filing angles may be used
to suit specific applications.
Rule of thumb:
Wider filing angles increase cutting
performance in softwood at summer
temperatures.
Narrower filing angles ensure a
smoother running chain and less
vibrations in hardwood and frozen
timber.
Filing angles of more than 35° or
less than 25° must be avoided
(except on ripping chains). Such
angles would shorten service life,
cause the chain to run roughly and
reduce cutting capacity.
The side plate angle, filing angle
and top plate cutting angle can vary
during the resharpening process.
As these angles have a significant
influence on the chain's cutting
ability, it is essential to maintain the
specified values.
3.14.6 Depth Gauge Setting
30°
30°
25°
30°
30°
30°
10°
The depth gauge is the small
projection just in front of the gullet
and cutting edge.
The difference in height between
the top of the depth gauge and the
leading edge of the top plate is
known as the depth gauge setting.
It determines the height at which the
cutter enters the wood (chip
thickness) and therefore has an
influence on chain cutting capacity.
The chain version determines the
shape of the depth gauge. The
depth gauge setting depends on the
chain pitch and the chain version.
As the top plate slopes downwards
to the rear (clearance angle), the
depth gauge setting is reduced as
the cutter gets shorter. The depth
gauge then has to lowered to the
specified setting.
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