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  • BSI
    BS 978-2:1952 Specification for fine pitch gears - Cycloidal type gears
    Edition: 1952
    $281.30
    / user per year

Description of BS 978-2:1952 1952

This part applies to cycloidal type spur gears for spring or weight-driven mechanisms in which:

  1. the pinion is the driven member, or
  2. the pinion is required to act sometimes as the driver and sometimes as the driven member.

For integrating electricity meters the particular form of gear specified herein is not necessary and it is recognised that other existing forms of gear will continue to be used.



Forms and proportions of spur gears for instruments and clockwork mechanisms from 0.070 modules to 1.000 module. Provisions for contrate gears, derivation of cycloidal gears (where the wheel drives the pinions), tolerances.

Standard NumberBS 978-2:1952
TitleSpecification for fine pitch gears - Cycloidal type gears
StatusConfirmed
Publication Date1952-01-24
DescriptorsGear parameters, Dimensional tolerances, Imperial system, Clock movements, Basic racks, Instruments, Tooth profiles, Dimensions, Time-measuring instrument components, Gear wheels, Spur gears, Gear drives
ICS21.200 Gears
CommitteeMCE/5
ISBN0 580 34084 8
PublisherBSI
Pages14

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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