Woodworking_joints

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Pocket-Hole Joinery being used to assemble a simple \'T-Joint\'.

Joinery often refers to the part of woodworking that involves the joining together of parts of wood.

Traditional wood joinery techniques address the distinctive material properties of wood, often without resorting to mechanical fasteners. There are different types of joinery for different structures. For example the joinery used to build a house is different from that used to make puzzle toys, although some concepts overlap.

Contents 1 Properties of wood 2 Materials used for joining 3 Types of joints 3.1 Images of different types of joints 4 Styles of Joinery 5 See also 6 Footnotes 7 References 8 External links

Properties of wood

Wood is anisotropic: its material properties are different along different dimensions. It is strong when stressed along the grain (longitudinally), but weak across it (radially and tangentially). It expands and contracts in response to humidity. This change is very small longitudinally. It is considerable, but unequal, in the radial and tangential directions. The frame and panel constructions of doors and cabinets is not purely decorative. The panel would be fragile without the support of the rails, whose grain runs perpendicular to that of the panel. But, if the rails were directly fastened to the panel, the difference in the rate of expansion across and along the grain would rip the two apart. When properly constructed, the panel is free to expand, while still supported by the frame.

Materials used for joining

• Joints can be designed to hold without the use of glue or fasteners.
• Glue is highly effective for joining wood when both surfaces of the joint are edge grain. A properly glued joint may be as strong as a single piece of wood. However, glue is ineffective on end-grain surfaces. Compared to a mortise and tenon, a dowel joint is a poor joint because it does not address these properties. Much of the surface of the hole of a dowel joint is end-grain, to which glue adheres poorly. In a mortise and tenon, most of the surface of the joint is longitudinal-grain. Animal glue is soluble in water, producing joints that can be disassembled using steam to soften the glue.
• Various mechanical fasteners are used, the simplest being nails and screws. Glue and fasteners can be added together.

Types of joints

Some types of joints used include:

• Biscuit join
• Bridle
• Butt
• Butterfly
• Dowel
• Coping
• Cope and stick
• Dado (US) or Housing Joint (UK)
• Dougong
• Dovetail
• Finger (US) or box combing (UK)
• Lap (halving joint)
  • Cross-lap
  • Halved joint
  • Dovetail-lap
  • End-lap (corner halving joint)
  • Middle-lap (Tee halving joint)
• Miter (mitre)
• Mortise and tenon
• Pocket-Hole Joinery
• Rabbet (rebate)
• Scarf (scarph)
• Splice joint
• Tongue and groove
• Frame and Panel (rail and style)

Images of different types of joints

Bridle joint	Woodworking-joint-butt-dowel.gif Dowel joint	Coped joint	Dado
Joinery-throughdovetail.gif Dovetail joint	Boxjoint.png Finger joint or box combing	Lap joints	Mitre joint square.png mitre (miter) joint
Mortise and tenon joint.svg Mortise and tenon joint	Rabbet or rebate	Scarf joint	Splice joints

Styles of Joinery

This short section requires expansion.

Two of the most common traditions of joinery are Chinese and European. The Japanese and the Chinese in particular developed hundreds of types of joints and their furniture was often held together without glue or nails. The Chinese have been using this method for the last seven thousand years.Steinhardt, Nancy W. (2002). Chinese Architecture, English Ed., Yale University Press, p. 7. ISBN 0-300-09559-7. 

See also

• Woodworking
• Cabinet making
• Building construction
• Chinese Wooden Architecture

Footnotes

References

• Bernard Jones (Ed.) (1980). The Complete Woodworker. ISBN 0-89815-022-1
• Peter Korn (1993). Working with Wood. ISBN 1-56158-041-4
• Sam Allen (1990). Wood Joiner\'s Handbook. Sterling Publishing. ISBN 0-8069-6999-7
• Wolfram Graubner (1992). Encyclopedia of Wood Joints. Taunton Press. ISBN 1-56158-004-X

External links

• DIYinfo.org\'s Carpentry Wiki - Practical information on creating various wood-working joints

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