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Wood Joints

Grade 8

What is Wood joints?

Wood joints (Joinery) is a part of woodworking that involves joining together pieces of wood, to create furniture, structures, toys, and other items. Some wood joints employ fasteners, bindings, or adhesives, while others use only wood elements.

When choosing and making an appropriate joint, there are five things to remember:

The smallest possible amount of timber should be cut away from the pieces being jointed.

Simple joints accurately cut are the best. Each part of the joint has equal strength. The form of the joint allows for the varying

strength and movement characteristics of the timber.

The bearing surfaces of the joint must be able to transfer the loads across the joint without failure.

Types of joints

Woodwork joints can be divided into five basic groups:

1 Lengthening joints 2 Widening joints(glued) 3 Widening joints (dry) 4 Framing joints 5 Hinged joints

Lengthening joints

Lengthening - end or lengthening joints are used when timber is required in longer lengths than those which occur naturally.

Examples of Lengthening joint

Examples of Lengthening joint

Widening joint (glued)

Widening (glued) - the edges of boards are jointed and glued together to increase the width of timber when wide panels are required.

Examples of widening joints (glued)

Examples of widening joints (glued)

Widening joint (dry)

Widening (dry) - joints are formed on the board edges which are fitted together dry and secured to a background frame to form large boarded areas such as floors. The function of these joints is to align the edges of the boards, while allowing some movement between the boards as they shrink or swell.

Examples of widening joints (dry)

Framing Joints

Framing - these joints are used to hold individual timbers together where they meet when set at an angle to each other and to transfer loads from one member to another without the joint failing.

Examples of Framing joints

Examples of Framing joints

Examples of Framing joints

Hinges

Hinges are used when one timber member is required to pivot or turn against another, e.g. doors in door frames, casements in window frames. In the majority of cases ironmongery is used in forming these joints

Examples of Hinges

Summary & Questions

Explain the term wood joints When making and choosing a

joint ,what should you consider? List the five basic groups of joints

and their function. State two examples of each group

of joins