Specification for straightedges Steel or granite straightedges of rectangular section

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

29-04-1977

Publisher

British Standards Institution

Foreword
Cooperating organizations
Specification
1. Scope
2. References
3. Definitions
4. Material and manufacture
5. Recommended sizes and design
6. Finish
7. Points of support for straightedges of 1 m length
    and over
8. Accuracy
9. Case
10. Protection against climatic conditions
11. Marking
Appendices
A. Note on supporting straightedges of rectangular
    section
B. Recommended methods of testing straightness of a
    straightedge
Tables
1. Minimum section
2. Tolerance on straightness of working face
3. Tolerance on parallelism of working face
4. Combined tolerance on flatness and parallelism of
    side faces
5. Best positions for supporting straightedges
6. Example of recording observations
Figures
1. Position of handling slots
2. Alternative methods of indicating the positions of
    support
3. Deflection with supports at ends
4. Deflection with supports near the centre
5. Optimum position for supports
6. Test by inclination method
7. Plotting of readings
8. Method of compensation for mass of level

Requirements for straightedges in a range of lengths from 300 to 2000 mm. Provides for two grades of accuracy. Appendices deal with the method of supporting straightedges and methods of testing for straightness.

This Part of BS 5204 specifies requirements for steel or granite straightedges up to and including 2 m in length, of rectangular section, with or without a bevelled edge, and with both working faces finished straight and parallel. Two grades of accuracy are provided for: grade A and grade B.

Appendices deal with the method of supporting straightedges of rectangular section and methods of testing straightness of a straightedge.

Committee	TPR/1
DevelopmentNote	Supersedes BS 863(1939) & 75/70860 DC. (07/2005) Reviewed and confirmed by BSI, February 2012. (01/2012)
DocumentType	Standard
Pages	14
PublisherName	British Standards Institution
Status	Current
Supersedes	BS 863:1939 BS 863(1939) : LATEST

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BS 5204-2:1977

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Table of Contents

Abstract

Scope

General Product Information

Standards Referenced By This Book

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