BS 6740-1987 通过测量半径变化测定不圆度偏差的方法

标准号：BS 6740-1987
中文标准名称：通过测量半径变化测定不圆度偏差的方法
英文标准名称：Method for determining departures from roundness by measuring variations in radius
标准类型：J04
发布日期：1987/2/27 12:00:00
实施日期：1987/2/27 12:00:00
中国标准分类号：J04
国际标准分类号：17.040.30
适用范围：This International Standard specifies a method for determining departures from roundness by measuring variations in radius by means of contact (stylus) instruments.It establishes a) types of instruments and general requirements;b) recommendations for the use of instruments;c) procedures for calibration of instruments and verification 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 zone circumscribed circle;d) centre of the maximun 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.