Coping saw

Coping saw
A coping saw.

A coping saw is a type of hand saw used to cut intricate external shapes and interior cutouts in woodworking or carpentry. It is widely used to cut moldings to create coped rather than miter joints. It is occasionally used to create fretwork though it is not able to match a fretsaw in intricacy of cut, particularly in thin materials. Coping saw blades are always thicker and much coarser cutting than typical fretsaw blades and many others of its family members.

A coping saw consists of a thin, hardened steel blade, stretched between the ends of a square, c-shaped, springy-iron frame to which a handle is attached. The blade is easily removed from the frame so that the blade can be passed through a drilled hole in the middle of a piece of wood. The frame is then re-attached to the blade and the cut starts from the middle of the piece. Long cuts perpendicular to the edge of the material are possible but the shallow depth of the frame rather limits how far from the edge one may cut. The much deeper frame of the fretsaw is more useful for cutting well away from the edge but conversely cannot manage the thicker materials commonly cut by the coping saws.

The coping saw blade is removable by partially unscrewing the handle. The blade is prevented from rotating by means of the short, steady bar provided where the blade is attached. Loosening the handle also allows the blade to be rotated relative to the frame as desired. Carefully aligning the finger steady bars at the top and bottom of the blade ensures that the thin blade is straight and not twisted along its length. Retightening the handle tensions the blade and locks it at the desired angle relative to the frame. The short steady bar nearest the handle is held securely between finger and thumb while the handle is tightened to ensure the blade remains at the desired angle. Unlike the fretsaw the coping saw blade has holding pins which lock securely into the angled slots of the rotatable blade holders.

The direction of the cut is quite easy to change because of the thinness of the blade. Gentle curves are achieved by slowly turning the whole frame by means of the handle while continuing to cut steadily. When necessary the blade can also be rotated with respect to the frame to make sharper curves in the material being cut. The teeth on a coping saw blade should normally face the handle. (i.e."backwards" as compared with most other Western saws); the action of pulling the coping saw allows the frame to remain in tension (and thus reduces blade breakages). This is the opposite to most other saws which only cut in the "push" direction. Normally the coping saw is used in the vertical position and reciprocated by hand power for the maximum stroke possible without striking the material with the frame. This takes much practice. It may also be used in all other attitudes when the work requires it but even greater skill is required. Blade breakage is fortunately much rarer than with a fretsaw.

A Coping saw (with the correct blade) can also be used to cut through aluminium tubing and other metal objects, though a Hacksaw is much more efficient than a coping saw for this task. The thin blade tends to make wavy cuts in thick materials unless skill is achieved by long practice on a wide variety of materials of varying thicknesses. The stroke length before the frame strikes the material above or below is the limiting factor in the maximum thickness of material. The work becomes progressively more difficult and tiring with increasing thickness of material.

A Coping saw is often used with a v-board, also known as a birdsmouth board, which is a flat board with a "V" shape cutout in one end. In use, the v-board is clamped to the bench so that the section with the cutout hangs over the edge. This allows the work to be held down flat whilst shapes are cut into it. Either the work or the saw frame may be rotated. The V-cutout allows the coping saw blade to pass through the work unimpeded. This technique is common in marquetry. Pressed, chrome-plated, steel V-boards are also quite common though care must be taken to avoid damaging the blade teeth by excessive rubbing on this hard material.

See also

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Look at other dictionaries:

  • coping saw — n. a handsaw with a narrow blade set in a U shaped frame, used esp. for cutting curved outlines: see SAW1 …   English World dictionary

  • coping saw — n. a D shaped saw for cutting curves in wood. Etymology: cope cut wood f. OF coper: see COPE(1) * * * ˈcoping saw 7 noun a ↑saw with a very narrow blade and a frame shaped like a D, used for cutting curves in wood   …   Useful english dictionary

  • coping saw — cop′ing saw n. bui a saw used for cutting small curves in wood, consisting of a thin, light blade in aU shaped frame with handle …   From formal English to slang

  • coping saw — /ˈkoʊpɪŋ sɔ/ (say kohping saw) noun a saw with a short, narrow blade held at both ends in a deeply recessed handle, for cutting curved shapes …  

  • coping-saw — copˈing saw noun A narrow saw blade held under tension in a wide, U shaped metal frame, used for cutting curves • • • Main Entry: ↑cope …   Useful english dictionary

  • coping saw — a saw consisting of a thin, light blade held, under tension, in a U shaped frame that has a handle: used for cutting small curves in wood. [1930 35] * * * …   Universalium

  • coping saw — noun a saw with a very narrow blade stretched across a D shaped frame, used for cutting curves in wood …   English new terms dictionary

  • coping saw — noun Etymology: from present participle of 4cope Date: 1925 a handsaw with a very narrow blade held under tension in a U shaped frame and used especially for cutting curves in wood …   New Collegiate Dictionary

  • coping — c.1600 as an architectural term, from cope (n.), the cape like vestment worn by priests (14c.), a variant of CAPE (Cf. cape). Coping saw attested by 1931 …   Etymology dictionary

  • Coping (joinery) — A coped joint A scribed joint (right end of sketch) is derived from an internal mitre cut …   Wikipedia

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