BS 4582-1:1970
Current
The latest, up-to-date edition.
Specification for fine pitch gears (metric module) Involute spur and helical gears
Hardcopy , PDF
English
03-27-1970
Co-operating organizations
Foreword
Specification
1 General
1.1 Scope
1.2 Terminology and notation
1.3 Standard modules
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 - test pressures and
limits of tolerance
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
5.1 Recommendation
Appendices
A Centre distance and addendum modification
B Examples of calculation
C Comparable metric modules and diametral pitches
D Single flank composite testing: limits of tolerance
E Calculation of measuring pin dimensions for
external and internal spur gears
Tables
1 Standard modules
2 Data for spur pinions of unit module having fewer
than 17 teeth
3 Centre distances for spur gear pairs of unit module
for the conditions given in 2.3, para. 1
4 Forces appropriate to the module suitable for brass
and steel product gears
5 Dual flank composite error tolerances
6 Limits of tolerance on gear blanks
7 Limits of tolerance on tooth profile
8 Limits of tolerance on pitch
9 Limits of tolerance on tooth alignment
10 Limits of tolerance on radial run-out of teeth
11 Limits of tolerance on tooth thickness
12 Tolerance on centre distance of mounting
13 Minimum depth of engagement for spur gear pairs
with 28 to 33 teeth (z2 + z1)
14 Minimum depth of engagement for spur gear pairs
with more than 33 teeth (z2 + z1)
Figures
1 Basic rack tooth profile for unit normal module
2 Basic rack tooth profile for unit normal module
with backlash allowance
3 Limiting values of addendum modification
coefficient
4 Minimum permissible addendum modification
coefficient for helical pinions (alpha n = 20 deg)
5 Tolerance zone for profile error
6 Examples of information to be given on drawings
7 Chart for normal backlash when x1 + x2 = y
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