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From Wikipedia, the free encyclopedia

90º Mitre joint (pieces ready to be joined)
Mitre joint of two pipes

A mitre joint (often miter in American English) is a joint made by cutting each of two parts to be joined, across the main surface, usually at a 45° angle, to form a corner, usually to form a 90° angle, though it can comprise any angle greater than 0 degrees. It is called beveling when the angled cut is done on the side, although the resulting joint is still a mitre joint.[1]

For woodworking, a disadvantage of a mitre joint is its weakness, but it can be strengthened with a spline (a thin wafer of wood inserted into a slot, usually arranged with the long grain of the spline across the short grain of the frame timber).[2] There are two common variations of a splined mitre joint, one where the spline is long and runs the length of the mating surfaces and another where the spline is perpendicular to the joined edges.

Common applications include picture frames, pipes, and molding.

YouTube Encyclopedic

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  • Fixing a "Not so Perfect" Mitered Joint

Transcription

Non-perpendicular joints

a disassembled 135º miter joint (internal angle of an octagon). Angle of the internal faces is supplement of 22.5º
A variation of the Mitre and Dovetail joint called a mitred dovetail. When assembled it appears identical to a mitre yet has the same strength as a dovetail joint.

For mitre joints occurring at angles other than 90°, for materials of the same cross-section the proper cut angle must be determined so that the two pieces to be joined meet flush (i.e. one piece's mitered end is not longer than the adjoining piece). To find the cut angle divide the angle at which the two pieces meet by two. Technically, two different cut angles are required; one for each piece, where the second angle is 90° plus the aforementioned cut angle, but due to angular limitations in common cutting implements (hand circular saws, table saws) a single angle is required and is used to cut the first piece in one direction and the second piece in the opposite direction.

See also

References

  1. ^ Oxford English Dictionary. Oxford University Press. 2009. A usually right-angled joint in wood or other material in which the angle made by the joined pieces is bisected by the line or plane of junction; more fully mitre joint
  2. ^ "Splined Miter Joint". Woodworkingtips.com. Retrieved 2012-04-01.

Further reading

  • Adamson, John, "The making of the mitre plane", Furniture & Cabinetmaking, issue 270, May 2018, pp. 44–9

External links

  • Miter Saw Calculator
  • Verhoeff, Tom and Koos Verhoeff, PDF "The Mathematics of Mitering and Its Artful Application", Bridges Leeuwarden: Mathematical Connections in Art, Music, and Science, Proceedings of the Eleventh Annual Bridges Conference, in The Netherlands, pp. 225–234, July 2008.
This page was last edited on 30 March 2023, at 02:32
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