Planer Operations - Jet JJP-12 Operating Instructions And Parts Manual

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Fence
Outfeed Table
Figure 23 – Beveling

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. 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 (F, 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.
The maximum thickness of wood that can be

removed in one pass is 1/8" for planning
operations on workpieces up to 5-1/2" wide.
The workpiece must be positioned away
from the center tab on the rollercase to cut
1/8".
The maximum thickness of wood that can be

removed in one pass is 1/16" for planing
operations on workpieces from 5-1/2" up to
12" wide.
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.
Infeed Table
19
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 planer

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. Rip 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.
Do not plane a board that is
less than 6" long. It is recommended that
when planing short boards you butt them
end to end to avoid kickback and reduce
snipe.
Feeding the Work
The planer is supplied with planer blades
mounted in the cutterhead and infeed and
outfeed rollers adjusted to the correct height.
The planer feed is automatic; it will vary slightly
depending on the type of wood.
Preparation:
Feed rate refers to the rate at which the

lumber travels through the planer.
is a precision