|KEY WORD : architecture / tools|
|A special plane used to cut bevelled corners. A shooting board, that serves as a guide, is attached to a small smoothing plane (see *hiraganna 平鉋). A wedge or screw is used to adjust the position of the guide to achieve the exact bevelled face required. The cross section of the corner may be a simple angle, or the cut-away section may, for example, be gourd-shaped, hyoutanmen 瓢箪面, smoothly rounded, or quadrantal. To achieve these shapes the edge of the cutting blade is made according to the shape of the moulding desired. There are also a variety of whetstones for sharpening the blade, selected according to the profile of the blade. With the exception of underground timbers, the mentoriganna is used to make a whole variety of elements in architectural construction including pillars, door frames, ledges, lattice-work, top beams and mullions.|
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