UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

close
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

close
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

ISO 4291

Methods for the Assessment of Departure from Roundness - Measurement of Variations in Radius

active, Most Current
Buy Now
Organization: ISO
Publication Date: 1 January 1985
Status: active
Page Count: 20
ICS Code (Properties of surfaces): 17.040.20
scope:

Scope and field of application

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 circumscribed circle;

d) centre of the maximum 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 rofation are dealt with in annexes A to D, respectively. Annex E gives rules for plotting and reading polar graphs.

NOTES

1 Profile transformation is defined in IS0 6318.

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.

Document History

ISO 4291
January 1, 1985
Methods for the Assessment of Departure from Roundness - Measurement of Variations in Radius
Scope and field of application This International Standard specifies a method for determining departures from roundness by measuring variations in radius by means of contact (stylus) instruments....

References

Advertisement