SIS SS-ISO 4292-1991 圆度误差评定法．两、三点法测量

标准号：SIS SS-ISO 4292-1991
中文标准名称：圆度误差评定法．两、三点法测量
英文标准名称：Methods for the assessment of departure from roundness — Measurement by two- and three-point methods
发布日期：1991/6/5 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：This International Standard specifies methods of numerical assessment of out-of-roundness determined by the combi-nation of two- and three-point measurement:a) determination by means of two-point measurement (measurement of diameters);b) determination by means of three-point measurement, summit (symmetrical or asymmetrical setting);c) determination by means of three-point measurement, rider (symmetrical setting).Any statement regarding an out-of-round sectton is incomplete unless the extent and nature of the departures from roundness are given. Methods for making such descriptions and evaluating them are specified in ISO 4291.For routine or in-process inspection, the procedure specified in ISO 4291 may either be needlessly accurate or the items to be inspected may be too large to be accommodated.The methods specified give faster and cheaper ways of assess-ing departures from roundness. This assessed value will deviate from the true value. The difference between the measured value and the true value can be estimated with the help of tables 2 to 8, assuming that the undulation numbers are known and of sinusoidal nature. For non-sinusoidal undulations, a theory for estimating such deviations is not yet available.