標準號：SIS SS-ISO 4291-1991
中文標準名稱：圓度誤差評定法．半徑變量測量
英文標準名稱：Methods for the assessment of departure from roundness — Measurement of varia- tions in radius
發布日期：1991/6/5 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：This International Standard specifies a method for determining departures from roundness by measuring variations in radius by means of contact (stylus) instruments.It establishesa) types of instruments and general requirements;b) recommendations for the use of instruments;c) procedures for calibration of instruments and verifica-tion of their characteristics.This International Standard applies to the assessment of the departures from ideal roundness of a workpiece through the medium of a profile transformation, obtained under reference conditions, expressed with respect to any one of the following centres :a) centre of the least squares circle;b) centre of the minimum zone circle;c) centre of the minimum circumscribed circle;d) centre of the maximum inscribed circle.Each of these centres may have its own particular application. The position of the least squares centre can be calculated from a simple explicit equation given in annex F.Departures from roundness of the measured profile, procedure, calibration and determination of systematic errors of rotation are dealt with in annexes A to D, respectively. Annex E gives rules for plotting and reading polar graphs.NOTES1 Profile transformation is defined in ISO 6318.2 Reference conditions include the stylus, frequency (imitations of an electric wave filter fif used), permissible eccentricity of the graphical or digital representation of the profile (generally 7 % to 15 % of its mean radius, see annex E), the position of the measured section or sections relative to some feature of the workpiece.