Care
must be taken in cutting the mortises to keep their sides clean
and sharp and to size.
In making the mortises for the keyed tenons, the length of mortise
must be slightly in excess of the width of the tenon--about
1/8-in. of play to each side of each tenon. With a shelf of the
width specified for this table, if such allowance is not made so
that the tenons may move sideways, the shrinkage would split the
shelf.
In cutting across the ends of the shelf, between the tenons, leave
a hole in the waste so that the turning saw or compass saw can be
inserted. Saw within one-sixteenth of the line, after which this
margin may be removed with chisel and mallet.
In Fig. 3 is shown two views of the keyed tenon and the key. The
mortise for the key is to be placed in the middle of the tenon. It
will be noted that this mortise is laid out 1-1/16 in. from the
shoulder of the tenon while the stretcher is 1-1/8 in. thick. This
is to insure the key's pulling the shelf tightly against the side
of the stretcher.
Keys may be made in a variety of shapes. The one shown is simple
and structurally good.
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