BS 978-1:1968
Current
The latest, up-to-date edition.
Hardcopy , PDF
English
31-01-1968
Co-operating organizations
Foreword
Specification
1 General
1.1 Scope
1.2 Terminology and notation
1.3 Preferred range of normal diametral pitches
1.4 Basic rack tooth profile
2 Design details
2.1 Outside diameter and centre distance
2.2 Modification of addendum and centre distance
3 Accuracy of gear blanks and gears
3.1 General
3.2 Dual flank composite testing
3.3 Limits of tolerance on blanks and gear elements
4 Limits and tolerances of assembly
4.1 Centre distance
4.2 Depth of engagement
5 Information to be given on drawings
Appendices
A Centre distance and addendum modification
B Examples of calculations
C Comparable diametral pitches and metric modules
D Single flank composite testing: limits of tolerance
E Calculation of measuring pin dimensions for
external and internal spur gears
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