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The joining technology is used in any type of mechanical joint which is the arrangement formed by two or more elements: typically, two physical parts and a joining element. The mechanical joining systems make possible to form a set of several pieces using the individual parts and the corresponding joining elements.
Biscuits are predominantly used in joining sheet goods such as plywood, particle board and medium-density fibreboard. They are sometimes used with solid wood, replacing mortise and tenon joints, as biscuit joints are easier to make and almost as strong. They are also used to align pieces when joined edge-to-edge in making wider panels.
Modern techniques include the use of a jointer machine, a hand held router and straight edge, or a table-mounted router. Although the process derives its name from the primary task of straightening an edge prior to joining, the term jointing is used whenever this process is performed, regardless of the application.
When joining boards at a right angle, it is important that the cuts are precise and square to prevent gaps or un-perpendicular joints between the boards. Some woodworkers lay out their project before drilling their pocket holes and mark the face of the board that they want to drill to ensure the hole is in the correct location.
A plain scarf joint A nibbed scarf joint A keyed, nibbed scarf, reinforced with fish plates and through bolts The scarf joint used on the beams above the post is known by its French name, trait de jupiter, or bolt-o-lightning joint.
The jointer derives its name from its primary function of producing flat edges on boards prior to joining them edge-to-edge to produce wider boards. The use of this term probably arises from the name of a type of hand plane , the jointer plane , which is also used primarily for this purpose.