Alternatively known as splicing, these joints are used to extend the length of boards and are more applicable to carpentry, although they have applications in furniture repair-work. Figure 173:1 shows the simple half lap splice,
LONG SPLICE (PLYWOOD ETC )
173:2 the bevel halving splice, 173:3 the tabled joint, and 173:4 the hooked splice. Figure 173:2 and 3 will resist end pull and to some extent a side swivel, while in 173:4 less stock is taken away at the root (X) and the joint is correspondingly stronger. Simple scarfing or splicing (173:5) relies on the glue only and, provided the joint is long enough, with from eight to 10 times the thickness in thin plywoods, the union can be as strong as a single length. Solid boards are usually scarfed at nine times the thickness, but some woods will hold at lesser angles.
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