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Reliance expands range of precision couplings

Reliance expands range of precision couplings Reliance Precision Mechatronics has expanded its range of one piece Reli-a-Flex couplings to add 6mm, 8mm and 10mm micro sizes to the original models which offer outside diameters from 13 to 40mm. These couplings retain all the advantages of Reli-a-Flex's patented design, and are ideal for the accurate, miniature motion control applications demanded by the printing, medical and scientific instrument markets.

The couplings have been specifically designed to provide extremely accurate transfer of motion between two rotating shafts, while catering for parallel and angular misalignment.

Reliance says that while other one piece couplings currently on the market may outwardly resemble the Reli-a-Flex(r) at first glance, there is one vital difference. The patented slot design on the Reli-a-Flex maintains a constant pivot length which minimises stress variations. On the Reli-a-Flex the pivot points travel back and forward without changing the centre piece angle, resulting in uniform stress levels and accurate angular rotation. Similar looking couplings on the market can actually have a slot pattern where the pivot points move in and out, and the centre piece angle varies. This causes stress variations and less uniform rotation.

In tests performed on typical applications, the bi-directional error produced by a Reli-a-Flex coupling used to drive a 3600 line encoder was four times smaller than that produced by a 4 beam spiral coupling. When used to drive a 6.35mm lead leadscrew, the bi-directional error from the Reli-a-Flex was six times less than that of the 4-beam spiral. Reli-a-Flex also offers predictable performance, having been tested for 50,000,000 cycles at its rated torque and 80% maximum offset.
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