Grizzly G1033X - Manual (Page 25)

Model g1033X (Mfg. since 4/12)
-23-
Workpiece
Inspection
some workpieces are not safe to plane or may
require modification before they are safe to pass
through the planer.
before cutting, inspect all
workpieces for the following:
• Material Type: this machine is only intend-
ed for planing workpieces of natural wood.
Attempting to plane workpieces of any other
material, including wood composites, could
lead to serious personal injury and property
damage.
• foreign Objects: inspect lumber for defects
and foreign objects (nails, staples, imbedded
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 the planing opera-
tion. large knots can cause kickback and
machine damage. Choose workpieces that
do not have large/loose knots when planing.
• Wet or "Green" Stock: Avoid planing 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 plane poorly and cause excessive wear
to the cutterhead and motor. Excess mois-
ture can also hasten rust and corrosion of the
planer and/or individual components.
• Excessive Warping: Workpieces with exces-
sive cupping, bowing, or twisting are danger-
ous to cut because they are unstable and
often unpredictable when being planed. do
not use workpieces with these characteris-
tics!
• Minor Cupping: Workpieces with slight cup-
ping can be safely supported if the cupped
side is facing the planer table. on the con-
trary, a workpiece supported on the bowed
side will rock during planing and could cause
severe injury from kickback.
Wood Hardness
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 in figure 14 shows the Janka hardness
rating for a number of commonly used species.
the larger the number, the harder the workpiece,
and the less material to 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 pin 420
Basswood 410
Eastern White pine 380
Balsa 100
figure 14. Janka hardness rating for some
common wood species.