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  • BSI
    BS 6740:1987, ISO 4291-1985 Method for determining departures from roundness by measuring variations in radius
    Edition: 1987
    $435.35
    / user per year

Description of BS 6740:1987 1987

This International Standard specifies a method for determining departures from roundness by measuring variations in radius by means of contact (stylus) instruments.

It establishes

  1. types of instruments and gener requirements;
  2. recommendations for the use of instrument
  3. procedures for calibration of instruments a 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:

  1. centre of the least squares circl
  2. centre of the minimum zone circl
  3. centre of the minimum circumscribed circl
  4. centre of the maximum inscribed circl

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 Annex A to Annex D, respectively. Annex E gives rules for plotting and reading polar graphs.

NOTE 1 Profile transformation is defined in ISO 6318.

NOTE 2 Reference conditions include the stylus, frequency limitations of an electric wave filter (if 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.



Uses contact (stylus) instruments.

Standard NumberBS 6740:1987, ISO 4291-1985
TitleMethod for determining departures from roundness by measuring variations in radius
StatusDefinitive
Publication Date1987-02-27
Identical National Standard OfISO 4291
DescriptorsRadius, Dimensional measurement, Profilometers, Profile measurement, Error analysis, Measuring instruments, Rotational motion, Testing conditions, Roundness measurement, Calibration, Graphic representation, Errors
ICS17.040.30 Measuring instruments
CommitteeTPR/1
ISBN0 580 15430 0
PublisherBSI
Pages24

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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