ASME B89.3.1 : 1972

MEASUREMENT OF OUT-OF-ROUNDNESS

American Society of Mechanical Engineers

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1 Scope
  1.1 General
  1.2 Appendix Sections
2 Definitions
  2.1 Surfaces vs. Profiles
  2.2 Nominal Profile
  2.3 Actual Profile
  2.4 Measured Profile
  2.5 Ideal Roundness
  2.6 Out-of-Roundness
  2.7 Out-of-Roundness Value
  2.8 Centers for Out-of-Roundness Measurement
  2.9 Preferred Center
3 Specification and Designation of Out-of-Roundness
  3.1 Lack of Roundness Specification
  3.2 Roundness Statement and Symbol
4 Selection of Measurement Positions
  4.1 Angular Position of Profile Plane
  4.2 Number and Axial Location of Profile Planes
  4.3 Location of Part Center - Relation to Instrument Axis
5 Instruments
  5.1 General
  5.2 Cycles per Revolution Response
  5.3 Stylus Radius
  5.4 Tolerances on Stylus Radii
  5.5 Stylus Static Force
Appendix A - Basic Concept of Roundness Measurement
A1 Objective of the Measurement
A2 Basic Measurement Considerations
A3 Reduction of Roughness Effects
A4 Unified Measurement Procedures
Appendix B - Capabilities and Limitations of Various Methods of
             Measurement
B1.1 Nonstandard Measurement Methods
B1.2 Out-of-Roundness Determined by Diametral Measurements
B2 Out-of-Roundness Determined by V-Block Measurement
B3 Out-of-Roundness Determinations by Other Methods
Appendix C - Assessment of Out-of-Roundness by Precision Spindle
             Instruments
C1 Reference Circles on Measured Polar Profiles
C2 Relation of Assessments to Each Other
C3 Effect of Variations in Cycles per Revolution Response
C4 Discontinuous Circular Profiles, Arcs, Fillet Radii
Appendix D - General Notes on Use of Spindle Type Instruments
D1 Selection of Optional Parameters
D2 Sources of Error
Appendix E - Relationship of Roundness to Other Measurements
E1.1 Roundness Tolerance
E1.2 Relationship of Roundness to Effective Size
E1.3 Axis Considerations
E1.4 Concentricity-Eccentricity
E1.5 Datum Axis
Tables
Figures

Abstract

Describes the specification and measurement of out of roundness of a surface of revolution by the evaluation of a typical cross sectional profile in relation to its radial deviations from a defined center. Deals with precision spindle instruments for out of roundness measurement and polar chart presentation, though does not exclude other methods. Does not define the requirements for roundness suitable for specific purposes.