-28-
For Machines Mfd. Since 10/21
South Bend Tools
Model SB1118
O P E R A T I O N
Some workpieces are not safe to use or may
require modifi cation before they are.
Before
planing, inspect all workpieces for the following:
• Material Type:
This machine is only
intended for workpieces of natural wood
fi ber Attempting to use workpieces of any
other material that may break apart during
operation could lead to serious personal
injury and property damage.
• Foreign Objects:
Inspect lumber for defects
and foreign objects (nails, staples, embedded
gravel, etc,). If you have any question about
the quality of your lumber, DO NOT use it.
Remember, wood stacked on a concrete floor
can have small pieces of stone or concrete
pressed into the surface.
• Large/Loose Knots:
Loose knots can become
dislodged during operation. Large knots can
cause kickback and machine damage. Always
use workpieces that do not have large/loose
knots.
• Wet or "Green" Stock:
Avoid using wood with
a high water content. Wood with more than
20% moisture content or wood exposed to
excessive moisture (such as rain or snow),
will cut poorly and cause excessive wear to
the machine. Excess moisture can also hasten
rust and corrosion of the machine and/or
individual components.
• Excessive Warping:
Workpieces with
excessive cupping, bowing, or twisting are
dangerous to cut because they are unstable
and often unpredictable when being
cut. DO NOT use workpieces with these
characteristics!
• Minor Cupping:
Though it is always best to
fl atten the cupped side on a jointer before
planing, workpieces with slight cupping
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.
Stock Inspection &
Requirements
The species of wood, as well as its condition,
greatly affects the depth of cut the planer can
effectively take with each pass.
The chart 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
Janka
Hardness
Ebony
3220
Red Mahogany
2697
Rosewood
1780
Red Pine
1630
Sugar Maple
1450
White Oak
1360
White Ash
1320
American Beech
1300
Red Oak
1290
Black Walnut
1010
Teak
1000
Black Cherry
950
Cedar
900
Sycamore
770
Douglas Fir
660
Chestnut
540
Hemlock
500
White Pine
420
Basswood
410
Eastern White Pine
380
Balsa
100
Wood Types
