ISO 4291:1985 PDF

Methods for the assessement of departure from roundness — Measurement of variations in radius

Название (английский):

ISO 4291:1985

Methods for the assessement of departure from roundness — Measurement of variations in radius

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 18
Дата публикации:: 12 сентября 1985 г.
Издание:: ISO IS 4291 edition 1 version 1
ICS:: 17.040.20

Язык документа:

ruen

Срок поставки:3 раб. дн. (перевод)

Цена:270 €

Описание (английский):

Establishes types of contact (stylus) instruments to be used, recommendations for their use, procedures for calibration of instruments and verification of their characteristics. Applies to a profile transformation, obtained under reference conditions. 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. The position of the least squares centre can be calculated from a simple explicit equation given in annex F.

Технические детали

Технический комитет: ISO/TC 213 - Dimensional and geometrical product specifications and verification
SKU: ISO 4291:1985

Abstract

Overview

ISO 4291:1985 - Methods for the assessment of departure from roundness: Measurement of variations in radius specifies how to determine departures from ideal roundness by measuring variations in radius using contact (stylus) instruments. The standard covers instrument types and requirements, recommendations for use, procedures for calibration and verification, and guidance on error analysis and plotting. It applies to profile transformations obtained under reference conditions and includes annexes addressing measured-profile assessment, measurement procedure, calibration, systematic rotation errors, polar-plot rules and a formula for the least‑squares centre.

Key topics and requirements

Instrument types: Stylus instruments with either a rotating stylus around a stationary workpiece or a rotating workpiece with a stationary stylus/transducer. Outputs can be profile recordings or direct parameter displays (or both).
Stylus selection: Recommended stylus radii include 0.25, 0.8, 2.5, 8 and 25 mm; stylus geometry examples (spherical, cylindrical, toroidal/hatchet, ovoidal) are described.
Stylus force: Adjustable up to 0.25 N and should be set to the lowest value that maintains continuous contact.
Frequency/response: Defines instrument response to sinusoidal undulations per revolution (upr). Band-edge transmission at rated termination should be ~75% of maximum; recommended filters are equivalent to two C–R networks of equal time constant, with allowance for phase‑corrected filters where required.
Error statements: Overall instrument error expressed as a percentage of the upper limit of the measuring range. Distinguishes radial and axial instrument errors, with requirements to state measurement positions and rates of change along the axis.
Reference centres for assessment: Roundness may be evaluated relative to the least squares centre, minimum zone centre, minimum circumscribed circle centre, or maximum inscribed circle centre (each has specific applications).
Annex coverage:
- Annex A: Departure from roundness of measured profile
- Annex B: Measurement procedure and setup guidance

Abstract

Overview

Key topics and requirements

Instrument types: Stylus instruments with either a rotating stylus around a stationary workpiece or a rotating workpiece with a stationary stylus/transducer. Outputs can be profile recordings or direct parameter displays (or both).
Stylus selection: Recommended stylus radii include 0.25, 0.8, 2.5, 8 and 25 mm; stylus geometry examples (spherical, cylindrical, toroidal/hatchet, ovoidal) are described.
Stylus force: Adjustable up to 0.25 N and should be set to the lowest value that maintains continuous contact.
Frequency/response: Defines instrument response to sinusoidal undulations per revolution (upr). Band-edge transmission at rated termination should be ~75% of maximum; recommended filters are equivalent to two C–R networks of equal time constant, with allowance for phase‑corrected filters where required.
Error statements: Overall instrument error expressed as a percentage of the upper limit of the measuring range. Distinguishes radial and axial instrument errors, with requirements to state measurement positions and rates of change along the axis.
Reference centres for assessment: Roundness may be evaluated relative to the least squares centre, minimum zone centre, minimum circumscribed circle centre, or maximum inscribed circle centre (each has specific applications).
Annex coverage:
- Annex A: Departure from roundness of measured profile
- Annex B: Measurement procedure and setup guidance

ISO 4291:1985 PDF

Технические детали

Abstract

Overview

Key topics and requirements

Abstract

Overview

Key topics and requirements

Applications and users

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