The Effect of Thermal Shrink and Expansion on Plastic Gear Geometry


When plastic gears are meshed with steel gears there can be the differences in thermal expansion between the two materials. If a particular gear mesh is expected to operate satisfactorily over a wide thermal range, the variations in mesh geometry due to temperature must be taken into account. These variable parameters can pose vexing problems to the plastics gear designer. This paper presents a straightforward way to consider the shrinkage of plastic gears both in molding and in operation.
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