Urrea CN1006 Manual De Usuario página 28

SURFACING
Surfacing is similar to the edge jointing opera-
tion except for the position of the workpiece.
For surfacing, the major flat surface of the
workpiece is placed on the infeed table of the
jointer with the narrow edge of the workpiece
against the fence, as shown in Fig. 26.
Fig.26
The workpiece is moved from the infeed table,
across the cutterhead to the outfeed table, es-
tablishing a flat surface on the workpiece.
CAUTION: Do not perform jointing opera-
tions on material shorter than 10 inches, nar-
rower than ¾ inch, or less than ½ inch thick.
BEVELING
To cut a bevel, lock the fence at the required
angle and run the work across the knives while
keeping the work firmly against the fence and
tables.
Several passes may be necessary to arrive at
the desired result. When the angle is small,
there is little difference whether the fence is
tilted in or out. However, at greater angles ap-
proaching 45 degrees, it is increasingly difficult
to hold the work properly when the fence is
tilted out.
The advantage of the double-tilting fence
is appreciated under such conditions. When
tilted in, the fence forms a V-shape with the
tables, and the work is easily pressed into the
pocket while passing it across the knives. If the
bevel is laid out on the piece in such direction
that this involves cutting against the grain, it
will be better to tilt the fence out.
TAPER CUTS
One of the most useful jointer operations is
cutting an edge to a taper. This method can be
used on a wide variety of work. Tapered legs
of furniture are a common example. Instead of
28
laying the piece on the infeed table, lower the
forward end of the work onto the outfeed ta-
ble. Do this very carefully, as the piece will span
the knives, and they will take a "bite" from the
work with a tendency to kick back unless the
piece is firmly held.
Now push the work forward as in ordinary
jointing. The effect is to surface off all the
stock in front of the knives, to increasing
depth, leaving a tapered surface.
The ridge left by the knives when starting the
taper may be removed by taking a very light
cut according to the regular method for joint-
ing, with the infeed table raised to its usual
position. Practice is required in this operation,
and the beginner is advised to make trial cuts
on waste material. The experienced craftsman
can easily do taper cuts over part of the length
and a number of other special operations.
SURFACING WARPED PIECES
If the wood to be surfaced is dished or warped,
take light cuts until the surface is flat. Avoid
forcing such material down against the table;
excessive pressure will spring it while passing
the knives, and it will spring back and remain
curved after the cut is completed.
CUTTING A RABBET
When making a rabbet cut, the cutterhead
guard must be removed.
CAUTION: After the rabbet cut is completed,
be certain guard is replaced.
1. Adjust the fence so that the distance be-
tween the end of the knives and the fence is
equal to the width of the rabbet.
2. Lower the infeed table an amount equal to
the depth of the rabbet. If the rabbet is quite
deep, it may be necessary to cut it in two or
more passes. In that event, the table is low-
ered an amount equal to about half the depth
of the rabbet for the first pass, then lowered
again to proper depth to complete the cut.
SURFACING SHORT OR THIN WORK
CAUTION: When surfacing short or thin
pieces, always use push blocks to minimize all
danger to the hands.
CAUTION: Do not perform surfacing opera-
tions on material shorter than 10 inches, nar-
rower than 3/4 inch, wider than 6 inches, or less
than 1/2 inch thick."