BS 6740:1987

National foreword
Committees responsible
Method
1. Scope and field of application
2. References
3. Definition
4. Instruments
Annexes
A. Departure from roundness of the measured profile of
    the workpiece
B. Procedure
C. Calibration
D. Determination of systematic errors of rotation
E. Rules for plotting and reading polar graphs
F. Determination of least squares centre and circle
Table
Limiting values of upr
Figures
1. Spherical stylus
2. Cylindrical stylus
3. Toroidal (hatchet) stylus
4. Ovoidal stylus
5. Typical transmissions showing rate of attenuation
    given by two independent C-R networks of equal
    time constant
6. Assessment of roundness from least squares centre,
    triangle Zq
7. Assessment of roundness from minimum zone centre,
    triangle Zz
8. Assessment of roundness from centre of minimum
    circumscribed circle, triangle Zc
9. Assessment of roundness from centre of maximum
    inscribed circle, triangle Zi
10. Slight increase of the radius of the eccentric
    plot in the perpendicular direction
11. Inclination of the axis of the workpiece to the
    axis of rotation
12. Choice of direction of measurement for a conical or
    toroidal workpiece
13. Ball-bearing raceway
14. Closely and widely spaced irregularities
15. Effect of stylus radius when in contact with
    surfaces
16. Traces by hatchet and sharp stylii
17. Errors in measurement resulting from variation of
    the offset
18. Dynamic calibration
19. Illustrations of spindle errors and test piece out-
    of-roundness
20. Example of spindle error and test piece error
21. Avoidance of excessive distortion due to polar
    plotting
22. Angular relationships
23. Diametral variations
24. Convex surfaces which appear concave after
    magnification
25. Determination of least squares centre and circle