Precision Power Transmission Roller Chains, Attachments, and Sprockets ASME B29.1
The original design of precision roller chain dates back to the late 1890s, although various
types of drive chains have been in use for centuries. The early automobiles used roller chains
extensively as the final drive. The industrial use for roller chains grew substantially, resulting in
the desirability of standardization. The perfected American standard chain of today has evolved
to meet the demand for ever-increasing horsepower and higher speeds, as well as accurate timing.
In 1913, the Society of Automotive Engineers (SAE) published formulas for calculating the
roller chain length, sprocket tooth profiles, and other important design criteria. Recommendations
from the Roller Chain Committee of the American Society of Mechanical Engineers (ASME)
followed in 1917 with dimensional standards for the various components and assemblies. Early
in 1920, through the cooperation of these two groups, roller chain standards were formulated
and recommended for acceptance by industry. The progress was followed in 1921 by organization
of a sprocket committee of the American Gear Manufacturers Association (AGMA).
ASA Sectional Committee B29, Transmission Chain, Sprockets, and Cutters, was organized in
1924 by the American Standards Association with ASME, AGMA, and SAE as sponsors. A
subcommittee on roller chains was established to study modern practices of roller chain manufacture
and use. Its recommendations on standards were approved by the Sectional Committee in
May 1929 and approved by the American Standards Association in July 1930. They were published
as B29a-1930, Roller Chain, Sprockets, and Cutters. This roller chain standard ensured interchangeability
and optional sources of supply.
In 1930, the Association of Roller and Silent Chain Manufacturers (ARSCM) was founded. The
objectives of the association were to cooperate in developing standards of sound engineering
and manufacturing practice, to foster improvements in chain performance, and to extend the use
of roller chains. This association was subsequently dissolved in 1960, and its members became
part of the American Sprocket Chain Manufacturers Association (ASCMA), which was organized
to bring together manufacturers of all types of sprocket-driven chains. The name of this group
was changed in 1971 to the American Chain Association (ACA).
thanks for your visit