BS 5221:1987

Superseded

View Superseded by

Specification for general purpose, metric module gear hobs

Available format(s)

Hardcopy , PDF

Superseded date

31-01-2010

Language(s)

English

Published date

30-06-1987

Publisher

British Standards Institution

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Status	Superseded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	BS ISO 4468:2009
Supersedes	BS 5221:1975

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