Since the time realized that the man first useful and necessary objects from different woods can be built, he has struggled with ways to connect a piece of wood to another. Some features of this wonderful material make the joining process quite complicated.

Wood will expand and contract depending on moisture content and the amount of moisture in the air. In situations of high humidity the wood will absorb moisture and expand. If the wood is exposed to verydry conditions will shrink it. This movement caused by moisture can actually force apart adjacent parts, if not properly joined. Over the years, woodworkers have learned that usually glue alone is no successful joint.

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