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• A Low-kickback
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FILING
TOOLS FOR FILING
Saw chain sharpening procedure
Square-ground Filing
WHO SHOULD PERFORM SQUARE-GROUND FILING?
Most chain saw users will probably never need to use square
ground chain, nor learn to perform square ground filing. But in
areas where the timber is larger and the guide bars used are
longer, the performance advantages of square-ground chain can
outweigh the fact that square-ground filing is more difficult
and much less forgiving of filing errors.
FILE POSITIONING
The file will sharpen the top plate, and the side plate,
simultaneously. This creates a line, (A), where the top plate
cutting angle meets the side-plate angle. For best results, file so
that the line joins the cutting corner (B).
CORRECTLY INCORRECT INCORRECT
FILED CORNER TOO HIGH TOO LOW
To properly sharpen the cutter, use the correct filing position,
as shown here from three different points of view:
FILE DIRECTION
The chain manufacturer
recommends that square-ground
chain be filed from the outside in
(in a downward direction). This
leaves a better edge on the
chromed cutting surfaces and
makes it easier to keep the file’s
position, and the resulting cutting
edges, in correct alignment as
shown in the preceding “File positioning” section. Filing from
the outside in will wear out your file faster, however. Some
square-ground chain users may prefer to file from the inside
out (in an upward direction). You should be aware that inside-
out filing is much more difficult. But whichever direction you
choose, be sure your file and your cutting edges stay
positioned as shown in the preceding “File positioning”
section. File all cutters on one side of the chain, then reverse
the chain and repeat the process. Use the same file positions
for cutters on the opposite side of the chain.
TOOLS
Only use files specially designed for square-ground chisel
cutters, available from your chain saw dealer.
DOUBLE BEVEL HEXAGON “GOOFY”
SIDE VIEW END VIEW TOP VIEW
Description
4.5 mm Round file
4.5 mm Assembled file guide
.025 inch Drop-centre depth-gauge tool
Depth-gauge file (flat)