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Top plate cutting angle
The top plate cutting angle is 60°. It is also obtained auto-
matically when the chain is sharpened carefully with file
holder 56057504310 or another STIHL sharpening tool.
Sharpening
Only special 3.5 mm dia. saw chain files (part No. 0811 411
8068) may be used for sharpening. The shape and cut of
machinists' files makes them unsuitable for saw chain. The
file holder 5605 750 4310 or a STIHL filing tool will insure
that the file is positioned correctly on the cutter.
All cutters must be filed to the same length. As the top plate
slopes downward to the rear (clearance angle) the cutter
heights will be uneven if the cutter lengths are different. 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 sharpen
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 procedure on the other
side.
The file must be held level with the top plate so that it is at
90° to the perpendicular faces of the chain links. The
cutters must always be filed from the inside to the out-
side.
File evenly and steadily and note that the file only
36
sharpens on the forward stroke.
Top:
Top plate CUlling angle
Center: File position
Boltom: Sharpening with the file holder
60°
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