Planer Operations - Jet JPJ-12B Operating Instructions And Parts Manual

Several passes may be required to achieve the
full bevel.
Figure 32

11.5 Planer Operations

Depth of Cut
Thickness planing refers to the sizing of lumber
to a desired thickness while creating a level
surface parallel to the opposite side of the board.
The board thickness that the planer will produce
is indicated by the scale and the depth-of-cut
gauge (see sect. 9.4, Table Height Adjustment).
Preset the planer to the desired thickness of the
finished workpiece using the gauge. The depth-
of-cut is adjusted by raising or lowering the planer
table (C, Fig. 5) using the handwheel (E, Fig. 5).

The quality of thickness planing depends
upon the operator's judgment about the depth
of cut.
 The depth of cut depends upon the width,
hardness, dampness, grain direction, and
grain structure of the wood.
 For optimum planing performance, the depth
of cut should be less than 1/16".

The board should be planed with shallow cuts
until the work has a level side. Once a level
surface has been created, flip the lumber and
create parallel sides.
 Plane alternate sides until the desired thick-
ness is obtained. When half of the total cut
has been taken from each side, the board will
have a uniform moisture content and
additional drying will not cause it to warp.
 The depth of cut should be shallower when
the workpiece is wider.
 When planing hardwood, take light cuts or
plane the wood in thin widths.
 Make a test cut with a test piece and verify
the thickness produced.
 Check the accuracy of the test cut before
working on the finished product.
Precautions
 A thickness
woodworking machine and should be used
on good-quality lumber only.
 Do not plane dirty boards; dirt and small
stones are abrasive and will wear out the
blade.
 Remove nails and staples. Use the planer to
cut wood only.
 Avoid knots. Heavily cross-grained wood
makes knots hard. Knots can come lose and
jam the blade. Any article that encounters
planer blades may be forcibly ejected from
the planer, creating a risk of injury.
Preparing the Work
 A thickness planer works best when the
lumber has at least one flat surface. Use a
jointer to create a flat surface.
 Twisted or severely warped boards can jam
the planer. Split the lumber in half to reduce
the magnitude of the warp.
 The work should be fed into the planer in the
same direction as the grain of the wood.
Sometimes the wood will change directions in
the middle of the board. In such cases, if
possible, cut the board in the middle so the
grain direction is correct.
less than 10" long. It is recommended that
when planing short boards, you butt them end
to end to avoid kickback and reduce snipe.
22
planer is a
Do not plane a board that is
precision