Double-Pitch Roller Chains, Attachments, and Sprockets
|Publication Date:||1 January 2011|
For the first edition of ASME B29.100, the B29 Standards Committee agreed to propose a draft standard to consolidate and revise the following three chain standards: ASME B29.1M, Precision Power Transmission Roller Chains, Attachments, and Sprockets; ASME B29.3M, Double-Pitch Power Transmission Roller Chains and Sprockets; and ASME B29.4M, Double-Pitch Conveyor Roller Chains, Attachments, and Sprockets. The new standardwas designated ASME B29.100-2002 and was approved as an American National Standard on April 3, 2002.
B29.3. For many years, roller chain manufacturers furnished for specific installations an economical power transmission chain differing only in pitch from the standardized series of transmission roller chains that conformed to American Standard ASA B29.1. Such practice became so common and the chains of such universal use that in 1948 the Roller Chain Technical Committee of the Association of Roller and Silent Chain Manufacturers, now known as the American Chain Association, developed standards that were submitted for adoption as American Standards.
This standard described a limited series of double-pitch power transmission roller chains that supplements the base chain series conforming to the standard B29.1. These chains differ from the base chains only in pitch, which is double that of the corresponding base chain. Supplementary information in Appendix A on speed and power transmission ratings indicated their special usefulness for drives operating at slow to moderate speeds, with moderate loads and long center distances.