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BSI BS 6740:1987

Method for determining departures from roundness by measuring variations in radius
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BSI BS 6740:1987

Method for determining departures from roundness by measuring variations in radius

PUBLISH DATE 1987
PAGES 24
BSI BS 6740:1987

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

It establishes:

  • types of instruments and gener requirements;
  • recommendations for the use of instrument;
  • 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:

  • centre of the least squares circl;
  • centre of the minimum zone circl;
  • centre of the minimum circumscribed circl;
  • 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.

SDO BSI: British Standards Institution
Document Number 6740
Publication Date Feb. 27, 1987
Language en - English
Page Count
Revision Level
Supercedes
Committee TPR/1
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