Miter joint

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Mitre joint (pieces ready to be joined).
Mitre joint (pieces ready to be joined).
Mitre joint of two pipes.
Mitre joint of two pipes.

A mitre or miter joint is a joint made by beveling each of two parts to be joined, usually at a 45° angle, to form a corner, usually a 90° angle. It is often used in making picture frames.

In woodwork, it is one way of joining two pieces of moulding that meet at an angle. (Compare the cope cut.)

It is a popular method of joining as it is easy and attractive. By itself, it is one of the weakest joints to choose, but it can be strengthened with a spline.

It is also done in pipe work, to take ducts around a corner, or in pipe organs, to fit a large bass pipe into a small space. (The same cut is used to shape of the resonators of certain reed ranks—e.g. see Great ranks and Pedal reeds of Ashton Hall organ—but only the other kind are called "mitered pipes". And, "mitered pipes" are sometimes constructed without miter cuts.

The joints of bicycle frames built with lugs are said to be mitred, but in this case the ends of the tubes are carefully cut or filed to fit the radius of the tube against which they are held. The joints are then brazed with brass or silver brazing rods.

[edit] See also

Mason's mitre

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