Wood Types - Grizzly G0958 Owner's Manual

Pitch & Glue Build-Up
Problem: Glue and resin buildup on the rollers
and cutterhead will cause overheating by decreas-
ing cutting sharpness while increasing drag in the
feed mechanism. The result can include scorched
lumber, uneven insert marks, and chatter.
Solution: Clean the rollers and cutterhead.
Chip Marks or Indentations
Problem: Chip indentation or chip bruising is the
result of wood chips not being thrown away from
the cutterhead and out of the machine. Instead
they are carried around the cutterhead, deposited
on the wood surface and crushed by the outfeed
roller. Some of the causes of chip indentation are:
•
Wood chips/sawdust not being properly
expelled from cutterhead.
•
The type of lumber being planed. Certain
species have a tendency to chip bruise.
•
A high moisture content (over 20%) or sur-
face moisture.
•
Dull knives/inserts.
•
Excessive depth of cut.
Solution:
• Use a proper dust collection system.
• Lumber must be completely dry, preferably
kiln-dried (KD). Air-dried (AD) lumber must
be seasoned properly and have no surface
moisture. DO NOT surface partially-air-dried
(PAD) lumber.
• Make sure knives/inserts are sharp.
• Reduce depth of cut.
Model G0958/G0959 (Mfd. Since 05/22)

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 higher 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 19. 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
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