Surface roughness - hyomenarasa (English spelling) surface roughness

Japanese: 表面あらさ - ひょうめんあらさ(英語表記)surface roughness
Surface roughness - hyomenarasa (English spelling) surface roughness
Although a machined surface may appear flat, a closer look reveals small irregular bumps on top of large wavy bumps. Surface roughness is a quantity related to the geometric shape, that is, the bumps and recesses that occur at small intervals on the surface that give rise to the sensation of a rough or smooth surface. Surface roughness, along with dimensional deviation and shape deviation, is an important item for evaluating the quality of machined parts. When a machined surface is cut on a plane perpendicular to it, the shape of the surface at the cut is called the cross-sectional curve.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
機械加工された表面は平らに見えても細かく見ると大きなうねり状の凸凹の上に細かい不規則な凸凹がある。表面あらさとは,ざらざらしている,つるつるしているという感覚のもとになっている表面に小さい間隔で起こる凸凹,すなわち幾何学的形状に関係する量である。表面あらさは寸法偏差,形状偏差とともに機械加工部品の品質を評価する重要な項目である。加工面をそれに対して垂直な面で切ったとき切口の表面の形状を断面曲線という。

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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