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  • BSI
    BS 978-2:Addendum No. 1:1959 Gears for instruments and clockwork mechanisms. Cycloidal type gears. - Double circular arc type gears
    Edition: 1959
    $281.30
    / user per year

Description of BS 978-2:Addendum No. 1:1959 1959

This specification relates to spur and helical gears with pitches of 0.15 to 0.7 mm module inclusive, the basic rack of the system having a normal tooth profile composed of two circular arcs.



Basic rack tooth shape and modules from 0.150 mm to 0.700 mm inclusive. Limits of tolerance for tip diameter, pitch, tooth thickness, profile, axial and radial run-out and centre distance; cutters for pinions with from six to twelve teeth.

Standard NumberBS 978-2:Addendum No. 1:1959
TitleGears for instruments and clockwork mechanisms. Cycloidal type gears. - Double circular arc type gears
StatusConfirmed
Publication Date1959-05-15
DescriptorsGear parameters, Instruments, Clock movements, Dimensional tolerances, Basic racks, Tooth profiles, Milling cutters, Dimensions, Spur gears, Time-measuring instrument components, Imperial system, Gear drives, Gear wheels, Helical gears
ICS21.200 Gears
CommitteeMCE/5
ISBN0 580 34084 8
PublisherBSI
Pages8

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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