End measure - Tandoki (English spelling)

Japanese: 端度器 - たんどき(英語表記)end measure
End measure - Tandoki (English spelling)
A measuring instrument that uses the distance between end faces as a fixed length standard. It is a measurement that embodies the length dimension in a rod-shaped object. There are three types of end faces: flat, cylindrical, and spherical. The types include: (1) parallel end standards with flat end faces and rectangular or circular cross sections; (2) disc gauges and cylindrical plug gauges with completely cylindrical measuring surfaces; (3) cylindrical end bar gauges and flat plug gauges with measuring surfaces that are part of the same cylinder; and (4) spherical bar gauges with measuring surfaces that belong to the same sphere and have a circular cross section. Block gauges, which are used as a standard for length, are a typical example of parallel end standards. End standards are generally made of tool steel, but special steels, cemented carbide, glass, and quartz are also used depending on the application.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
端面と端面の間隔を一定の長さの基準とした測定器。長さの寸法を棒状の物体に具体化したものである。端面には平面,円筒面,球面の3種があり,種類としては,(1) 端面が平らな平面で,断面が長方形または円形の平行端度器,(2) 測定面が完全な円筒形の円板ゲージや円筒形プラグゲージ,(3) 測定面が同一円筒の一部から成る円筒端バーゲージや平プラグゲージ,(4) 測定面が同一球面に属し,断面が円形の球面棒ゲージ,などがある。長さの基準として用いられるブロックゲージは,平行端度器の代表的なものである。端度器の材料には一般に工具鋼を使用するが,用途に応じて,特殊鋼,超硬合金,ガラス,水晶なども用いられる。

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