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 ofthe responsibility to thoroughly define the
gear requirements to the gear producer.
Plastic gear transmission design and manufacturing must consider the relationship ofgear
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.

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