Oregon 760 Mode D'emploi page 11

Sharpening
MOWER BLADES
Free the blade of any grease,
dirt, or clippings prior to
sharpening. Check the blades to make sure they are not
bent or cracked. Using a blade balancer, check the blade for
its balance. When sharpening start by grinding the light end
of the blade and then follow with the heavy end.
Move the blade in one direction only. Assuming that
you have a standard mower blade, your direction
would be from left to right. Rest blade on table, gently
move blade into rotating wheel and draw the blade to
the right. Multiple passes are required to achieve the
edge desired. Minimal pressure to the contact wheel is
recommended. The idea is to have the belt do the cutting,
not by using force against the contact wheel. Make rapid
passes, each pass should only take seconds in total
time. If you are not moving the blade across the wheel
in a rapid fashion, you will create hot spots in the blade,
and the blade will not move easily across the wheel.
After sharpening the first edge, use the slack area
of the belt to remove any burrs that may have been
created in the sharpening procedure. Next, move to
the second edge and repeat the procedure. Check the
balance of the blade to ensure proper stock removal.
WARNING:
If a belt is damaged or
shows excessive wear, immediately
stop use of the belt and discard it.
MULCHING BLADE
SHARPENING
Remove the vertical platen by
removing the two Allen bolts that attach it to the contact
wheel guard. It is important to readjust the contact wheel
guard to remove the pinch point created by removing the
platen. By removing the platen you create a large "slack"
free belt area. By using a flexible back belt (J weight) or a
narrow stiff back belt you will be able to use the slack area
to sharpen the blade. The operator will freehand the desired
angle. After sharpening the first edge, use the slack area of
the belt to remove any burrs that may have been created in
the sharpening procedure. Next, move to the second edge
and repeat the procedure. Check the balance of the blade to
ensure proper stock removal.
ROTARY-STYLE
OFFSET FLAIL BLADE
SHARPENING
Free the blade of any foreign
substances. Depending on style of the blade, balancing the
blade maybe different than described in this manual. Most
rotary blades can be balanced using a simple balance-style
scale. Since there is no other way to check for balance due
to the offset hole style of the blades, use of a scale is to
make sure that the blades are all equal in mass. Using a
scale allows you to make sure each blade weighs the same
amount, keeping the blades in balance.
You may also choose to check the blades using a standard
scale. Once again, start with the lightest blade and then
sharpen the heavier blade, checking the blades for balance.
Attach the galvanized tubing (Item 6, page 12) to the
worktable, using two button head black oxide screws
(Item 14, page 12) and two kep nuts (Item 8, page 12).
This changes the angle for the rotary-style blade to a
Lawn Mower Blade Sharpening
factory recommended angle. As with mower blades, it is
recommended to move the blade in one direction only.
If the blade has deep chips, use the contact wheel to
"face the blade." Move up on the contact wheel a couple
of inches to the centerline and run the blade back and
forth several times to even the edge of the blade. Next
you will rest the blade against the tubing and start the
sharpening process. Again, use only light inward pressure.
The belt and speed of the belt will do all the work for you.
CHIPPER BLADE
SHARPENING
Free the blade of any foreign
substances. Depending on
style of the blade, balancing the blade maybe different than
described in this manual. Most chippers require all blades to
be the same height. Start with the shortest blade and use it
for a reference, then move on to the others in the set.
Only sharpen blades that are long and wide
enough to safely hold on to. As with any
sharpening process on the grinder move only in
one direction and apply minimal inward force.
Grinding Belts
Oregon® recommends using only a 3M or Norton
24 or 36 grit ceramic belts to sharpen blades using
the blade attachment (Norton Blaze R980). These
belts contain cooling aids and are constructed
for heavy stock removal. Replacement belts can
be ordered from your Oregon distributor.
Remove any burrs on the back of the blade by
making a couple of passes on the slack portion
of the belt. This will reduce the effort required
when moving the blade across the table.
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