Geometric tolerance zone

Japanese: 幾何学的公差域 - きかがくてきこうさいき
Geometric tolerance zone

...Such shape and position accuracy indicates the degree of deviation that the shape and position of each part of a machine part can tolerate from the geometrically ideal shape, direction, or position intended at the time of design, and JIS specifies the types of shape and position accuracy and their corresponding graphic symbols. This standard defines the area in which the features that make up the shape of an item, such as points, lines, axes, and surfaces, can deviate from the geometrically exact shape, and shows how to illustrate this using symbols. This area is called the geometric tolerance area, and its value is called the geometric tolerance. For example, straightness is defined as the amount by which a part that is specified to be functionally straight deviates from a geometrically exact straight line, and flatness, roundness, etc. are also defined in a similar manner, and their respective methods of entry are specified. ...

*Some of the terminology explanations that refer to "geometric tolerance zone" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このような形状および位置の精度とは,機械部品の各部の形状や位置が,設計の際に意図された幾何学的に理想的な形状,方向または位置から,どの程度までの狂いなら許容することができるかということを示すもので,JISでは形状および位置の精度の種類ならびにその図記号について定めている。この規格は,品物の形状を構成する点,線,軸線,面などの形体が,幾何学的に正確な形から狂ってもよい領域を定め,これを記号を用いて図示する方法を示したもので,この領域を幾何学的公差域,その値を幾何学的公差という。例えば真直度とは,機能上直線であるように指定された部分が,幾何学的に正確な直線から狂っている大きさを示す,と定義づけられており,平面度,真円度などについても,これに準じて定義づけられ,その記入法がそれぞれ定められている。…

※「幾何学的公差域」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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