Tech Talks

How to properly secure bearings Part 1: Why do bearings move out?

Tech Talks by igus helping solve design engineering problems with motion plastics

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tech talk Learn more at To make life a bit easier, some manufacturers of plastic plain bearings will provide recommendations for how much surface load a bearing can take, as well as the appropriate temperature range to ensure bearings stay in place. What to do besides selecting the right material? The wrap-up: Careful material selection and strategic design are vital for securing bearings against moving out of housing bores. Different design choices for securing bearings are covered in part two of this series. The consequence Bearings that move in the housing bore do not automatically fall out of it completely. If they cannot move axially, they can still rotate. This can lead to squeaking and decreased overall running performance. The worst case is, of course, a bearing that exits the housing completely, as it leaves the shaft unprotected and results in significant wear. High temperatures or loads will not always lead to system failures of epic proportions. The specific load-to-surface ratios and temperatures requiring specific materials or additional axial securing vary based on the plastic material and compound. High speed rotation caused overheating, which led to lost press fit and the bearing rotating in the housing instead of the shaft. Dust originates from the housing and bearing material.

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