Coping (joinery)

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A coped joint Joinery-coping.gif
A coped joint
A scribed joint (right end of sketch) is derived from an internal mitre cut (left end) by cutting along the inside face of the mitre cut at a right angle to the board, typically with a coping saw. Scribed-joint.jpg
A scribed joint (right end of sketch) is derived from an internal mitre cut (left end) by cutting along the inside face of the mitre cut at a right angle to the board, typically with a coping saw.
Scribing a pencil line to fit two pieces of wood together. Scribe line A.jpg
Scribing a pencil line to fit two pieces of wood together.

Coping or scribing is the woodworking technique of shaping the end of a moulding or frame component to neatly fit the contours of an abutting member. Joining tubular members in metalworking is also referred to as a cope, or sometimes a "fish mouth joint" or saddle joint. [1]

Contents

Most English-speaking countries outside the United States use the terms scribe and scribing.

Coping is commonly used in the fitting of skirting and other mouldings in a room. It allows for clean joints between intersecting members when walls are not square to each other. The other method of fitting these mouldings that is commonly used is the mitre joint, but this technique relies upon knowing the precise angle between the walls for neat results. Coping is only ever used for internal corners. External corners are always mitred.

The main reason that scribed joints are used is that timber shrinks in width far more than it does in length. By using a scribed joint rather than an internal mitre joint, the effect of shrinkage is minimised. Also it is possible to arrange the scribed joints pointing away from the most common viewpoint (usually the doorway of a room) and so present the best appearance.

Coping is also commonly used in cabinet making for mouldings and frame components. The rails in frame and panel construction are commonly cope cut to fit the profile of the stiles. The technique is also common in the construction of doors and windows.

Scribe joinery is also commonly used in the building of log homes. The shape of the log underneath is scribed into the bottom of a log to be placed on top. This provides a tight seal between the two adjacent logs. It is also commonly used in the building of boats since there is rarely a straight edge but frequently many curves.

Traditionally, coping would be performed using a coping saw. There are also mechanical means of producing coped joints, including matching rail and stile cutters for the router as used in frame and panel construction.

See also

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A mason's mitre is a type of mitre joint, traditionally used in stonework or masonry but commonly seen in kitchen countertops. In a mason's mitre, the two elements being joined meet as for a butt joint but a small section of one member is removed creating a socket to receive the end of the other. A small mitre is made at the inside edges of the socket and on the end of the intersecting member so that edge treatments are carried through the joint appropriately.

Bridle joint

A bridle joint is a woodworking joint, similar to a mortise and tenon, in that a tenon is cut on the end of one member and a mortise is cut into the other to accept it. The distinguishing feature is that the tenon and the mortise are cut to the full width of the tenon member.

This glossary of woodworking lists a number of specialized terms and concepts used in woodworking, carpentry, and related disciplines.

American historic carpentry

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References

  1. "Saddle Joint Templates". weldingweb.com.