Tools
The tools commonly used by Japanese carpenters are divided into a few basic families, within which there are found a multitude of variations and specializations geared toward particular tasks:
Japanese saw (nokogiri 鋸), which cuts on the pull stroke, rather than the European style push stroke. This allows the blades to be quite thin in comparison to the Western saw. There are two main kinds of cutting teeth on Japanese saws: rip (yoko noko-giri)and crosscut (tate-noko-giri). The rip and crosscut are combined in one blade, known as a ryoba (lit. "dual edge":; 両刃). The rip and crosscut patterns are also made in single-edged saws, kataha nokogiri 片刃, both with stiffening back pieces and without. The stiff-backed saws, known as douzuki (lit. "with guide"; 導付き) are typically used in cutting fine joinery. There are many other types of Japanese saws as well: osae-biki 押さえ引き鋸 (lit. "press-cut saw"), used for flush-cutting pegs to a surface without marring the surface. The saw teeth have no set to one or both sides to accomplish this feat. There is the azebiki (lit. ridge saw; 畔挽き), which has cutting both rip and crosscut teeth, and is short and rounded in profile. It is used for sawing in confined areas and starting cuts in the middle of surfaces. There are many other types and sub-types of saw. Most saws sold in the West are mass produced items with induction-hardened teeth and relatively cheap replaceable blades. The handmade forged saws are very laborious to make and involve more manufacturing steps in the forging to complete than planes of chisels.
Japanese plane (kanna 鉋), is most commonly a wooden block, or dai (台) containing a laminated blade, sub-blade, and securing pin. This is similar in respects to the archaic type of European wooden plane, in which the blade is fixed in place by tapping down upon a wooden wedge. In the Japanese plane, the blade is fixed in position primarily by the confines of the plane's throat opening. Unlike a western plane, the support bed for the blade is not a flat surface in a Japanese plane - rather it is convex. The blade itself is tapered both in thickness and in width so as to wedge tightly into the dai when tapped down into place. Japanese planes are operated by pulling rather than pushing, and much work is done in the seated position or alongside a planing beam.
Considered part of the kanna family, the yarigana is an archaic type of Japanese plane resembling a spear. The yarigana is a single piece of steel with one end being used as a handle and the other forged into a leaf shaped blade. The carpenter holds the yarigana with two hands, perpendicular to his arms, and pulls towards his body producing a concave gouge in the timber. The yarigana was in universal use prior to the introduction of the block-mounted wood plane to Japan, and is today typically reserved for use on large circular columns or in cases where a more rustic appearance is desired in the final element.
Japanese chisel (nomi 鑿). These come in a larger variety of types and gradations than the Western chisel. There are bench chisels, paring chisels, striking chisels, heavy timber chisels and slicks, and myriad others for specialized applications. Like the planes, the blades are of laminated hard steel/soft steel construction. Bevel angle varies from 20˚ to 35˚ typically, with mortising and heavy chisels featuring steep angles, and paring chisels having shallower angles. It is common in Japan to work with softwoods, so many chisels are made with that in mind, and require the bevels be steepened if employed for harder woods.
Japanese gimlet (kiri 錐). The kiri is used for boring circular holes in a timber, often as the first stage in the hollowing out of a mortise. Though seemingly simple to use, the kiri is commonly considered one of the most difficult tools to master.
Japanese axe and adze (ono 斧 and chōna 釿).
Japanese hammer (tsuchi 槌).
Tools for measuring and marking include the inkpot (sumitsubo 墨壺), bamboo pen (sumisashi 墨さし), carpenter's square (sashigane 差し金), and the traditional marking gauge (kebiki 罫引), among others.
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