BS 5221:1987
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Specification for general purpose, metric module gear hobs
Hardcopy , PDF
31-01-2010
English
30-06-1987
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Foreword
Committees responsible
Specification
1 Scope
2 Definitions and symbols
3 Grades
4 Tooth form
5 Dimensions
6 Tolerances for grades of hobs
7 Bore and arbor
8 Bosses
9 Gashes
10 Keys and keyways
11 Tenon drive
12 Marking
Appendices
A Information to be supplied by the purchaser
B Derivations of tolerances
Tables
1 Dimensions of hobs
2 Test requirements
3 Dimensions of keyway in hob
4 Tolerances for parallel arbor diameters and
dimensions of key for arbor
5 Tolerances on bore for grades of hobs
6 Dimensions of tenon drive
Figures
1 Terminology
2 Basic gear rack tooth profile for unit normal metric
module with 20 degree pressure angle
3 Hob with axial keyway
4 Hob with tenon drive
5 Keyway in hob
6 Key for arbor
7 Tenon drive
Dimensional and accuracy requirements for non-topping single start right handed and left handed hobs used in the manufacture of spur and helical gears in accordance with BS 436-2. Dimensional requirements apply to monobloc hobs only, however the accuracy requirements may be used for monobloc or inserted tooth hobs.
| Committee |
MCE/5
|
| DevelopmentNote |
Supersedes BS 5221(1975). (05/2005) Supersedes 85/70670 DC. (07/2005) Reviewed and confirmed by BSI, September 2005. (08/2005)
|
| DocumentType |
Standard
|
| Pages |
24
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| BS 4500-1:1969 | ISO limits and fits General, tolerances and deviations |
| BS 5517:1977 | Specification for dimensions of metric long arbors and their accessories for milling machines |
| BS 436-2:1970 | Spur and helical gears Basic rack form, modules and accuracy (1 to 50 metric module) |
| BS 2519-2:1976 | Glossary for gears Notation |
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