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Jointer-specific rules:
•
always joint with cupped side of workpiece
facing down, otherwise workpiece could rock
during cut, increasing likelihood of kickback.
•
make sure your workpiece exceeds the mini-
mum dimension requirements (see figures
29 & 30) before edge jointing or surface plan-
ing, or it may break or kick back during the
operation!
12" min.
⁄
"
3
4
min.
⁄
" min.
1
4
figure 29. minimum dimensions for edge jointing
and surface planing (jointer).
thickness planer-specific rules:
•
use the full width of the planer. alternate
between the left, the right, and the middle
when feeding narrower lumber into the planer.
your knives will remain sharp much longer.
12" min.
⁄
" min.
1
4
1" min.
figure 30. minimum dimensions for surface
planing (thickness planer).
Model G0634Z/G0634XP (Mfd. Since 01/11)
12" min.
⁄
"
1
2
min.
1" min.
Wood types
the species of wood, as well as its condition,
greatly affects the depth of cut the jointer/planer
can effectively take with each pass.
the chart in the figure below shows the Janka
hardness rating for a number of commonly
used species. the larger the number, the harder
the workpiece, and the less material should be
removed in any one pass for good results.
note: The Janka Hardness Rating is expressed in
pounds of force required to embed a 0.444" steel
ball into the surface of the wood to a depth equal
to half the ball's diameter.
species
ebony
red mahogany
rosewood
red pine
sugar maple
white oak
white ash
american Beech
red oak
Black walnut
teak
Black Cherry
Cedar
sycamore
douglas Fir
Chestnut
hemlock
white pine
Basswood
eastern white pine
Balsa
figure 31. Janka hardness rating for some
common wood species.
Janka
hardness
3220
2697
1780
1630
1450
1360
1320
1300
1290
1010
1000
950
900
770
660
540
500
420
410
380
100
-31-
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