Flatness - Heimendo (English spelling) Planeness; flatness

Japanese: 平面度 - へいめんど(英語表記)planeness; flatness
Flatness - Heimendo (English spelling) Planeness; flatness
The degree to which the flat part of a machine part deviates from an exact plane; shape error. Flatness can be expressed either by considering a plane that passes through three points on the flat part of the machine as far apart as possible, and expressing it as the maximum deviation from this (maximum runout flatness), or by expressing it as the maximum inclination from the exact plane (maximum inclination flatness). In addition, where optical reflection can be used, flatness can also be measured or displayed using the radius of curvature of the flat part. There are also optical measurement methods that use interference fringes or an autocollimator. In manufacturing sites, a simple method is also used in which flatness is calculated from the amount of contact by grinding against a reference surface plate.

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

Japanese:
機械部品の平面部分の正確な平面からはずれた度合い,形状誤差。平面度を表わすには機械の平面部分のできるだけ離れた3点を通る平面を考え,これからの偏差の最大値をもって表わす場合 (最大ふれ式平面度) と,正確な平面との間の最大の傾斜で表わす場合 (最大傾斜式平面度) とがある。また光学的な反射が利用できるものでは,平面部分の曲率半径をもって平面度を測定あるいは表示することもできる。干渉縞やオートコリメータを利用した光学的測定法もある。また工作現場では,基準定盤とのすり合せによるあたりの量から求める簡便な方法も用いられる。

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