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CHECKING
BLADE
HEIGHT
Refer to Figure 9.
Once outfeed table is set, a straightedge
can be used
to check blade height.
•
Follow the procedure described above in "Adjusting
Outfeed Table".
•
This examination should be performed each time
before unit is used.
•
When blades do not contact the straightedge, blades
are dull.
•
Although the outfeed table may be lowered to
compensate for dull blades, the quality of cut will be
reduced (See Maintenance).
WARNING:
Using dull blades reduces life of blades
and creates greater wear on all machine parts.
snipe happens when the outfeed table is too low.
level cut indicates that the table is adjusted correctly.
L
curved taper cut occurs when the outfeed table is too high.
igure 9 -Table Height
CHECKING
FOR WORN BLADES
Refer to Figure 10.
Condition of blades will affect precision of cut. If blade
wear is not observed when checking the blade height,
the quality of cut will indicate the blade condition.
•
Dull blades will tear rather than sever the wood fiber.
•
A raised grain will occur when dull blades pound on
wood where there is difference in density.
•
A raised ridge will be produced where the blades
have been nicked.
3harp blades shave wood.
Dull blades tear wood while removing it.
=igure 10 - Blade Condition
AVOID DAMAGE
TO BLADES
Jointer is a precision woodworking machine and should
only be used on quality lumber. Jointing bad lumber
could result in a poor quality cut on subsequent pieces.
•
Do not plane dirty boards. Dirt and stones are
abrasive and will wear blades.
•
Remove nails and staples. Jointer should only cut
wood.
•
Avoid knots. Heavy cross-grain makes knots hard
and they can come loose and jam the jointer.
•
Assess value of badly warped boards; operator can
be tempted to use too deep of cut to square boards
quickly. When work is finished board is not useful size.
CUTTING
DEPTH
Refer to Figure 11.
The surface that a jointer will produce will be smoother
if shallower depth of cut is used. The positive stop for a
1/8" cut indicates the intended maximum depth of cut.
• Warped boards should not be cut in one pass. Use
several passes to maintain a level surface.
•
Plane alternate sides of a board, each at half the
desired depth of cut; this will create a more even
moisture content in the wood and help prevent future
warpage.
•
Deep cuts require more power and cause greater
wear on all machine parts.
Shallow depth of cut produces an even surface.
_arger depth of cut uses more power and reduces quality of
sut.
Figure 11 - Cutting Depth
FEEDING
WORK
Refer to Figure 12, page 11
Feed rate refers to rate at which wood is passed over
blades. An even feed will produce a uniform surface.
•
Keep enough pressure to hold work to both tables
and fence.
•
Use push blocks to hold wood onto both the infeed
and outfeed tables and be careful not to push on
wood above blades.
•
Push work across blades by using push blocks with
a walking motion.
WARNING:
Always keep at least one block on the
wood to prevent kickback.
10
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