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  • BSI
    BS 978-1:1968 Specification for fine pitch gears. - Involute spur and helical gears
    Edition: 1968
    $442.60
    / user per year

Description of BS 978-1:1968 1968

This British Standard relates to involute spur, helical and crossed helical gears, having diametral pitches finer than 20, in four accuracy grades. Examples of application are:

Class A. Astronomical apparatus and scientific instruments; colour printing machinery; control systems (when multiple trains of gears are involved this grade would generally be used for low speed components where the effect of positional accuracy is important).

Class B. Navigational instruments; high speed components of control systems where quietness and smooth running are essential; machine tool speed control; photographic instruments.

Class C. General purpose instruments; accounting and calculating machinery; counters; clockwork mechanisms.

Class D. Textile machinery; switch operating gear; clockwork mechanisms where accuracy is not the primary consideration.

It is recommended that all spur, helical and crossed helical gears for use in horology should be produced to this British Standard with the possible exception of gears for weight or spring-driven mechanisms in which the pinion is the driven member and has 12 or fewer teeth. In such cases it may be preferable to use gears conforming to BS 978-22).



Gears of pitch range greater than 20, up to 200 diametral pitch. Standard pitches; two basic racks (one with backlash allowance); modification of addendum and centre distance to suit various conditions. Four grades of accuracy with elemental and dual flank composite test tolerances. Appendices: single flank testing, calculation of measuring pin dimensions, calculations for various design conditions.

Standard NumberBS 978-1:1968
TitleSpecification for fine pitch gears. - Involute spur and helical gears
StatusConfirmed
Publication Date1968-01-31
DescriptorsBasic racks, Dimensions, Mathematical calculations, Accuracy, Dimensional tolerances, Gear pairs, Time-measuring instrument components, Gear wheels, Gear parameters, Tooth profiles, Instruments, Gear drives, Grades (quality), Imperial system, Helical gears, Spur gears, Clock movements, Blanks
ICS21.200 Gears
CommitteeMCE/5
ISBN0 580 00028 1
PublisherBSI
Pages36

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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