Fig. 149.
Fig. 150.
82. Directions for Cross-Lap Joint.
—Second Method. The two members are to be planed to width and thickness in one piece but are not to be separated until the grooves have been laid out and cut. The grooves must be laid out by measurement only, since superposition is impossible. The positions of the grooves relative to the faces are, as in the first method, one on the face and one on the side opposite. The gaging for both is done from the faces.
83. Glue Joint.
—Frequently it becomes necessary to glue together a number of boards to make one wide enough to meet the requirements of the work in hand. A table top is a good illustration. A properly glued butt joint ought to be stronger than the natural wood.
When the wood is of sufficient thickness, the joint may be reinforced by means of dowels. The jointer should be used for planing the edges. It is extremely difficult to prepare edges for glue joints with the shorter planes. The jack plane should be used to rough off the edges and prepare them for the jointer.
Fig. 151.