What is BS 978-2 - double circular arc type gears about?

BS 978-2 is a British Standard that discusses gears for instruments and clockwork mechanisms.

BS 978-2 is the second part of the BS 978 multi-series, and relates to spur and helical gears with pitches of 0.15 to 0.7 mm module inclusive, the basic rack of the system has a normal tooth profile composed of two circular arcs.

Who is BS 978-2 - double circular arc type gears for?

BS 978-2 on double circular arc type gears is useful for:

Manufacturers and suppliers of gears
Manufacturers of cycloidal gears
Product design teams/innovation teams
Production / mechanical engineers
Quality control personnel
Health and safety authorities
Users of cycloidal gears

Why should you use BS 978-2 - double circular arc type gears?

The cycloidal gear profile is a form of toothed gear used in mechanical clocks, rather than the involute gear form used for most other gears.

BS 978-2 walks you through the normal modules, terminology and notation, form of tooth, tolerances, and cutters of double circular arc type gears.

Detailed diagrams and tables have been provided in BS 978-2 to illustrate the shapes and dimensions of double circular arc type gears.

BS 978-2 guideline helps you to follow best practices when designing and manufacturing double circular arc type gears. This lets you demonstrate the efficiency and reliability of your double circular arcs gears.

BS 978-2:Addendum No. 1:1959

Gears for instruments and clockwork mechanisms. Cycloidal type gears. - Double circular arc type gears

Current

Published:

15 May 1959