Tech Talks

How to properly secure bearings part 3: anti-rotational features

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

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tech talk Learn more at Here are some options of how to achieve anti-rotation features: 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. Option 1: Anti-rotation with holes in the flange By drilling holes in the flange (or implementing them in the injection mold), the simple holes can serve as an anti-rotation feature. Screws are simply put inside to fix the bearing to the housing. For higher quantities, this design is not the best, since assembly requires manual labor and is therefore more time consuming. On top of that, the costs for screws for each bearing need to be factored in. Option 2: Anti-rotation features with simple form-fit on the outer diameter Simple, reliable and cost-effective measures can be taken to keep bearings in place. Form-fit means that the bearing shape itself serves as an anti- rotation feature. This can be achieved by changing the round outer shape of a bearing into something with an edge, or any other protruding feature. The cost increase for an according injection mold is relatively low. It should be considered, however, that a corresponding shape in the housing hole will be needed. For automated assembly, it may be necessary to make sure the bearings are always properly aligned with the housing hole. Bearing with fixation holes in the flange Form-fit anti-rotation feature on the outer diameter Plastic plain bearings can be made in almost any shape or form. The limitations of metal/bronze/ PTFE bearings, such as sheet metal thicknesses or the necessity of lubrication grooves do not exist. Furthermore, manufacturing technologies like injection-molding, 3D printing, sintering and machining of barstock materials allow users to design with few limitations. Free design choices with plastic bearings

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