BS 5204-2:1977
Current
The latest, up-to-date edition.
Specification for straightedges Steel or granite straightedges of rectangular section
Hardcopy , PDF
English
04-29-1977
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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.
| 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 |
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.
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