18
ENGLISH
Sharpening criteria:
WARNING:
An excessive distance
between the cutting edge and depth gauge
increases the risk of kickback.
2
2
1
1
3
1
►
1.
Cutter length
2.
Distance between cutting
edge and depth gauge
3.
Minimum cutter
length (3 mm (1/8"))
— All cutter length must be equal. Different
cutter lengths prevent the saw chain from
running smoothly and may cause the saw
chain to break.
— Do not sharpen the chain when the cutter
length has reached 3 mm (1/8") or shorter.
The chain must be replaced with new one.
— The chip thickness is determined by the
distance between the depth gauge (round
nose) and the cutting edge.
— The best cutting results are obtained with
following distance between cutting edge
and depth gauge.
•
Chain blade 90PX : 0.65 mm (0.025″)
30
30
55
55
— The sharpening angle of 30° must be
the same on all cutters. Different cutter
angles cause the chain to run roughly and
unevenly, accelerate wear, and lead to
chain breaks.
— Use a suitable round file so that the proper
sharpening angle is kept against the teeth.
•
Chain blade 90PX : 55°
File and file guiding
— Use a special round file (optional accessory)
for saw chains to sharpen the chain. Normal
round files are not suitable.
— Diameter of the round file for each saw
chain is as follows:
•
Chain blade 90PX : 4.5 mm (3/16″)
— The file should only engage the cutter on
the forward stroke. Lift the file off the cutter
on the return stroke.
— Sharpen the shortest cutter first. Then the
length of this shortest cutter becomes the
standard for all other cutters on the saw
chain.
— Guide the file as shown in the figure.
1
2
►
1.
File
2.
Saw chain
— The file can be guided more easily if a file
holder (optional accessory) is employed.
The file holder has markings for the correct
sharpening angle of 30° (align the mark
-
ings parallel to the saw chain) and limits
the depth of penetration (to 4/5 of the file
diameter).
30
1/5
1
►
1.
File holder
