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stock inspection &
requirements
basic rules to follow before milling stock on
a jointer or thickness planer:
•
large/loose Knots: loose knots can
become dislodged and kickback during
operation, causing machine damage. ensure
workpieces that do not have large/loose
knots.
•
excessive Warping: workpieces with exces-
sive cupping, bowing, or twisting are danger-
ous to cut because they are unstable and
often unpredictable when being cut. do not
use workpieces with these characteristics!
•
do not joint or surface plane against the
grain direction. Cutting against the grain
increases the likelihood of stock kickback, as
well as tear-out on the workpiece.
Jointing and surface planing with the
•
grain produces a better finish and is safer
for the operator. Cutting with the grain is
described as feeding the stock so the grain
points down and toward you on the jointer
(figure 27) or away from you on the planer
(figure 28), as viewed from the edge.
note: If the grain changes direction along the
edge of the board, decrease the cutting depth
and make additional passes.
CORRECT
INCORRECT
figure 27. Correct and incorrect grain alignment
to cutterhead (jointer).
-30-
With Grain
Against Grain
CORRECT
INCORRECT
figure 28. Correct and incorrect grain alignment
to cutterhead (planer).
minor cupping: workpieces with slight cup-
•
ping can be safely supported if the cupped
side is facing the table. on the contrary,
a workpiece supported on the bowed side
will rock during operation and could cause
severe injury from kickback.
remove foreign objects from the stock.
•
make sure that any stock you process with
the jointer/planer is clean and free of any dirt,
nails, staples, tiny rocks or any other foreign
objects, which if they hit the knives and are
drawn into the dust collector, may cause a
fire hazard. the particles may also damage
the knives. wood stacked on a concrete floor
can have small pieces of stone or concrete
pressed into the surface.
•
only process natural wood fiber through
your jointer/planer. never joint or plane
mdF, particle board, plywood, laminates or
other synthetically made materials.
•
make sure all stock is sufficiently dried
before jointing or planing. wood with a
moisture content over 20% will cause unnec-
essary wear on the knives and poor cutting
results. excess moisture can also hasten rust
and corrosion.
•
scrape all glue off of boards before
planing.
•
Keep your work area clear.
Model G0634Z/G0634XP (Mfd. Since 01/11)
With Grain
Against Grain
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