Jet JWP-12DX, Owner'S Manual

Page: 10 / 23

10
Grain Direction
Always feed the board so the knives are cutting
in the same direction as the wood grain, as
shown in Figure 9. If you cut against the grain,
the wood may “chip out” leaving an undesirable
finish.
Knots and Trouble Spots
Wood with knots, and “wild” grain is always
difficult to surface and requires extra care.
Check that any knots are solid. Do not plane
stock with loose knots.
Take light cuts. Be
especially cautious of kickbacks and stop cutting
immediately if the board will not feed smoothly.
Snipe
Use the head locks (A, Fig. 10) during the
finishing passes to reduce snipe.
These are
friction locks only, and will still allow you to raise
or lower the head, however, you should always
loosen locks prior to raising or lowering the
head.
If the end of the stock is allowed to
“droop” when it is fed into or coming out of the
planer, the knives may cut a large snipe (gouge)
at the beginning or end of the board.
If the
snipe is deep, be more careful how the board is
supported.
Keep it parallel to and flat on the
table at all times. Use a support roller and/or
support stand for extra support at both the
infeed and outfeed ends of the planer. If snipe
cannot be avoided cut the material longer than
needed and trim the ends.
Ridges
Damaged or nicked knives leave long ridges
along the entire length of a board.
WARNING
Never attempt to plane second-hand lumber,
painted or varnished wood, plywood, or
particle board. These materials will damage
planer knives.
Failure to comply may cause serious injury!
Make sure to inspect each board before
attempting to plane it. Do not attempt to plane
second-hand
lumber with nails below the
surface, painted wood, plywood, hardboard,
wood with a glue bead, or any other material
other than solid wood.
Planing Rough Lumber
CAUTION
Make sure wood is properly dried before
planing. Wet or “green” lumber may clog
the machine and lead to damage.
Air dried wood should stand for at least a year
per inch of thickness of the rough cut stock.
The moisture content of air dried wood should
be about 12% to 15%. Kiln dried woods should
have a moisture content of approximately 10%.
Wood to be used in fine furniture should have a
moisture content of 7% to 8%.
Joint one edge of the rough cut lumber before
planing. This allows you to determine the way
the grain travels. Feed the board into the planer
so the knives cut with the grain, see figure 9.
Measure the rough lumber at several locations
to find the thickest part.
As wood dries, it
dimensions vary - including its thickness. Set
the planer to take a very shallow cut on the
highest, thickest part of the board. Continue to
take very shallow cuts until you can determine
whether there are any knots or unusual grain
patterns.
After completing one side, inspect the other side
for irregularities.