Historical

ANSI/AGMA 9000-D11 (R2016)

Flexible Couplings - Potential Unbalance Classification


This standard was developed after intensive study of existing standards, literature, design practices, and manufacturing procedures for the balancing of flexible couplings. The intent of this document is to offer designers, manufacturers and users standard criteria for the unbalance classification of flexible couplings.  The information contained within this standard does not necessarily agree with some existing specifications for other rotating components and equipment. This standard is based upon the design criteria, related to the balancing of couplings, that have evolved over many years of successful industry practice.  At first, the coupling industry informally adopted, by usage, one tenth ounce-inch as a standard of unbalance tolerance. It soon became evident that for larger couplings this was an impractical tolerance. It also became evident that the runout of the balancing arbor as well as its own unbalance were very important factors in the final potential unbalance remaining in the corrected coupling. These facts were pointed out in Paper AGMA 519.01, October, 1967, the first AGMA technical paper written on the subject of flexible couplings. Shortly after the publication of this paper, Product Group 5 asked the Technical Committee to write an AGMA balancing standard for flexible couplings. It was recognized that existing balancing specifications such as MIL-STD 167 (ships) and ISO 1940 did not address flexible couplings.  AGMA 515.01 was intended as a guide to coupling users. The first rough draft of this standard was made in October of 1968. The first committee draft was prepared in February of 1972. It was approved by the membership on July 9, 1973.  AGMA 515.02 was a revision of AGMA 515.01. It was reviewed by the members of the Flexible Couplings Product Group 5 in January, 1974 and was revised in January, 1975 and again in September, 1975. It was approved by the membership on August 18, 1976.  ANSI/AGMA 9000-C90 was a revision and redesignation of AGMA 515.02. In the revision there were changes and corrections in the method of calculating the total potential unbalance of couplings (including the effects of hardware and eccentricity). The calculations gave a more accurate value of the potential unbalance of a coupling. The examples in the appendices were revised to show a generic coupling which illustrates the calculation methods presented. It was approved by the AGMA membership in November 1989, and was adopted as a National Standard on February 28, 1990.  ANSI/AGMA 9000-D11 is a revision of ANSI/AGMA 9000-C90. This revision introduces the use of ANSI S2-1999 or ISO 1940-1:2003 for the specification of balance quality grades for components or assemblies and how to properly apply that information to flexible coupling potential unbalance. It also contains numerous annexes for generic general purpose and high performance couplings. These annexes show how to apply the calculation methods of this standard for both component and assembly balancing of flexible couplings. Each annex also contains a discussion section and a section on the "value of the balance grade” which explains why a better balance grade may not result in a better balanced coupling assembly.  The first draft of ANSI/AGMA 9000-D11 was made in October, 2005. It was approved by the AGMA membership in April, 2011. It was approved as an American National Standard on August 10, 2011.


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American Gear Manufacturers Association [agma]

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