This standard covers the specification and measurement of out-of-roundness of a surface of revolution by the evaluation of a typical cross-sectional profile in terms of its radial deviations from a defined center. While this standard deals primarily with precision spindle instruments for out-of-roundness measurement and polar chart presentation, it is not the intent here to exclude other methods which will provide valid radial deviation data. This standard does not define the design requirements for roundness suitable for specific purposes, nor does it specify the manufacturing process for production of roundness.
The complexity of roundness measurements has necessitated the publication of a series of Appendix sections which describe other out-of-roundness indication methods, their applications and limitations. Other general information and specific examples of out-of-roundness measurement may be found in the Appendix, which the reader is urged to study. The Appendix sections shall not be considered a part of this standard.