Types of joints

Any junction between two components or materials that are intended to stay together could be considered a joint. Joints may rely on adhesion (e.g. butt joints) or they may be mechanically interlocked (e.g. dovetail joints) or they may involve some form of mechanical fastening such as screws, nails or other more specialized hardware. Many specialized types of worked or interlocking joints have been developed for use in joining wood in cabinet-making and these can be classified into three main groups: widening joints; angle or box joints; and framing joints.

Widening joints are used to produce wide boards from a number of narrow boards by joining them edge to edge. Examples of widening joints are shown in Figure 2.23.

Angle joints are generally used for fixing together pieces which have their faces at right-angles and edges flush. This includes corner angle joints used in box-like constructions such as solid cabinets, boxes and drawers and joints where one piece meets another, with the faces

Widening Joints
Figure 2.23 Examples of widening joints: (a) rubbed joint; (b) short dowels; (c) slot screws; (d) tongue and groove (traditional cross-grained tongue); (e) loose tongue and groove (plywood tongue); (f ) tongue and groove; (g) rebate; (h) long dowels

of the pieces at right-angles, but not at an end, as occurs for example with shelves and partitions in cupboards. Examples of angle joints, of which the dovetail is perhaps the most well known, are shown in Figure 2.24.

Framing joints are used in frame-like constructions such as chairs, tables, panelled doors and some picture frames. The members are usually jointed end to edge with their edges at right-angles and where the face sides of the members are usually flush. Examples, including the familiar mortise and tenon, are shown in Figure 2.25.

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