oni-arashikou ganna　鬼荒仕工鉋

KEY WORD :　architecture / tools

A preliminary roughing plane. The oni-arashiko ganna has only a single cutting blade, expressed as ichimaiganna 一枚鉋, unlike most other planes, for example the *arashikou ganna 荒仕工鉋, *chuushikou ganna 中仕工鉋, and *joushikou ganna 上仕工鉋, which have two blades. The oni-arashikou ganna is used to roughly plane timber and flattern the surface before going on to use other finer planes. Consequently a large quantity of thick shavings are produced through the wide mouth. Another feature of the oni-arashikou ganna is that the central part of the blade-edge expands slightly in a convex curve. This is because one can reduce the force used without losing stability, and with repeated paring the projections in the wood can be smoothed rapidly.

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