the fence at a distance from the saw that will cause the
first cut to run on the waste side of the line that
indicates the left side of the groove. Start the saw and
bring the wood into light contact with it; then stop the
saw and examine the layout to ensure the cut will be
on the waste side of the line. Readjust the fence, if
necessary. When the position of the fence is right,
make the cut. Then, reverse the wood and proceed to
set and test as before for the cut on the opposite side
of the groove. Make as many recuts as necessary to
remove the waste stock between the side kerfs.
The procedure for grooving or dadoing with the
dado head is about the same, except that, in many
cases, the dado head can be built up to take out all the
waste in a single cut. The two outside cutters alone
will cut a groove 1/4 inch wide. Inside cutters vary in
thickness from 1/16 to 1/4 inch.
A stopped groove or stopped dado can be cut on
the circular saw, using either a saw blade or a dado
head, as follows: If the groove or dado is stopped at
only one end, clamp a stop block to the rear of the
table in a position that will stop the wood from being
fed any farther when the saw has reached the place
where the groove or dado is supposed to stop. If the
groove or dado is stopped at both ends, clamp a stop
block to the rear of the table and a starting block to the
front. The starting block should be placed so the saw
will contact the place where the groove is supposed to
start when the infeed end of the piece is against the
block. Start the cut by holding the wood above the saw,
with the infeed end against the starting block and the
edge against the fence. Then, lower the wood gradually
onto the saw, and feed it through to the stop block.
A rabbet can be cut on the circular saw as follows:
The cut into the face of the wood is called the
shoulder cut, and the cut into the edge or end, the
cheek cut. To make the shoulder cut (which should be
made first), set the saw to extend above the table a
distance equal to the desired depth of the cheek. Be
sure to measure this distance from a sawtooth set to
the left, or away from the ripping fence. If you
measure it from a tooth set to the right or toward the
fence, the cheek will be too deep by an amount equal
to the width of the saw kerf.
By using the dado head, you can cut most
ordinary rabbets in a single cut. First, build up a dado
head equal in thickness to the desired width of the
cheek. Next, set the head to protrude above the table
a distance equal to the desired depth of the should.
Clamp a 1-inch board to the fence to serve as a guide
for the piece, and set the fence so the edge of the
board barely contacts the right side of the dado head.
Set the piece against the miter gauge (set at 90°), hold
the edge or end to be rabbeted against the l-inch
board, and make the cut.
On some jointers, a rabbeting ledge attached to
the outer edge of the infeed table can be depressed for
rabbeting, as shown in figure 3-53. The ledge is
located on the outer end of the butterhead. To rabbet
on a jointer of this type, you depress the infeed table
and the rabbeting ledge the depth of the rabbet below
the outfeed table, and set the fence the width of the
rabbet away from the outer end of the butterhead.
When the piece is fed through, the unrabbeted part
feeds onto the rabbeting ledge. The rabbeted portion
feeds onto the outfeed table.
Various combinations of the grooved joints are
used in woodworking. The tongue-and-groove joint
is a combination of the groove and the rabbet, with the
tongued member rabbeted on both faces. In some types
of paneling, the tongue is made by rabbeting only one
face. A tongue of this kind is called a barefaced
tongue. A joint often used in making boxes, drawers,
and cabinets is the dado and rabbet joint, shown in
figure 3-54. As you can see, one of the members is
rabbeted on one face to form a barefaced tongue.
The mortise-and-tenon joint is most frequently
used in furniture and cabinet work. In the blind
mortise-and-tenon joint, the tenon does not penetrate
Figure 3-53.-Rabbeting on a jointer with a rabbeting ledge.