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Advanced Engineering 2021

NEC Birmingham(B40 1NT)

03/11/2021 - 04/11/2021

Join us in our 12th and most important edition to date, as we invite engineers and management from all (more)

Cut out cage creep

Cut out cage creep Caged roller units can suffer from a phenomenon known as cage creep. This can be especially prevalent in crossed-roller devices and is often found in systems where linear guides are in continuous use, are mounted vertically or misaligned, or where there are high levels of acceleration and variations in payloads. Different manufacturers have developed a variety of mechanisms to overcome the problem, with one of the most effective being the use of a simple rack and pinion mechanism that keeps cages permanently centred by synchronising the movement of the cage and roller assembly. In the system developed by SKF, for example, the plastic moulding that forms each individual cage cell also incorporates a small plastic toothed sprocket at its centre, with corresponding tiny notches being machined in each side of the V-shaped guide rails. As the block moves, the roller cage automatically meshes with the rail, ensuring that each set of cage components synchronise effectively, keeping the complete cage unit correctly aligned during the lifetime of the linear guide and eliminating the need for re-centring or replacement. Perhaps as importantly, as the anti-cage creep mechanism is integrated within the roller cage structure, there is no increase in the overall size or weight of the linear guide; similarly, it is possible to extend the application of these devices into areas where vertical orientation, high acceleration of varying payloads would previously have caused problems.

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