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application’s specifications in terms of torque capacity, angular and parallel misalignment capabilities, and torsional and lateral bending rates. By adapting the design of the helical beam shaft coupling


concept, Abssac is also able to alter the coupling’s resonant frequency and improve its resistance to fatigue. Other design options include shaft connections that enable the assembly to be dismantled easily and quickly and flexure configurations that permit more angular offset than would be normal for this type of coupling.


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Fig. 3. Helical beam couplings can be configured to accommodate large angular offsets.


Miniaturisation


With miniaturisation becoming commonplace, Abssac has also been asked to manufacture smaller couplings. For example, a fully functional 3.1 mm diameter shaft coupling was supplied for a medical application. Using a left- and right-handed threaded shaft for attachment, the coupling could accept angular offsets while rotating at up to 10,000 RPM. The same customer then requested a double-start flexure with a 1.5 mm outside diameter produced in titanium. Huco Dynatork, another company with shaft


coupling expertise, has recently selected Victrex Peek (polyetheretherketone) for a special variant of its Multi- Beam couplings. These are replacing metal components in a demanding, high-voltage electronics assembly application within the manufacturing process for plasma TV screens. Peek offers excellent insulation due to its high surface


resistance and comparative tracking index. In addition, this material has a high dielectric constant and its mechanical properties meant it could be used for a coupling design that gave the required flexibility within an acceptable working envelope. As well as being suitable for applications requiring


electrical resistance, the Peek couplings can also be used where relatively high temperatures are encountered or chemical resistance is necessary, such are the properties of this high- performance polymer. Aluminium and stainless steel are used most often, but


Huco Dynatork regularly produces couplings in plastics such as nylon and acetal for use in the food and chemical industries. l


Circle 31 or ✔ at www.engineerlive.com/asia


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