This information sheet is intended to aid the designer to select an appropriate set of specifications that will clearly convey to the producer what is required. Implications and reasons for the design specifications are discussed. Suggested data forms are given in annexes A, B and C.
TYPES OF GEARS AND PROCESSES
These specifications cover the types of plastic gears commonly manufactured by injection molding. Specifications are described for involute external and internal spur and helical gears. Less common bevel and face gears are not covered here because their specifications are significantly different, although they can be injection molded. Gears made by methods other than injection molding may require other specifications or practices.
[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of AGMA 909-A06, Specifications for Molded Plastic Gears.]
The committee, responding to the widely recognized need for improving the technical communication between molded plastic gear purchasers and producers, developed this specification information sheet. The primary objective of this information sheet is to increase understanding by the gear purchaser of the responsibility to thoroughly define the gear requirements to the gear producer.
Plastic gear transmission design and manufacturing must consider the relationship of gear geometry, layout, housings, shafts, bearings, and materials. Molded plastic gears offer considerable design flexibility. However, physical properties and dimensions will vary over the range of operating conditions. To accommodate these variations and the molding process, the plastic gear designer must create detailed gear specifications for producing prototype or production gears. This information must clearly communicate to the gear producer what the gear designer specifies.
The first draft of AGMA 909-A06 was made in June, 2001. It was approved by the AGMA membership in July 18, 2006.
Suggestions for improvement of this standard will be welcome. They should be sent to the American Gear Manufacturers Association, 1001 N. Fairfax Street, Suite 500, Alexandria, Virginia 22314.
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