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I saw this video of adjusting conveyor belt tension and I wonder how the adjustment actually works mechanically https://youtu.be/eKkJN7WkCfw?t=152

As you can see, each of the two sides can be adjusted by turning a corresponding bolt. Considering the roller is fitted on a solid shaft, wouldn't pushing one side forward cause the shaft to bend? How does the roller and its shaft change orientation when the shaft and the roller are solid?

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They use special bearings called spherical bearings which allow a lot of axle movement. There are a lot of varieties of these depending on the type of load and amount of axis accommodation required..

https://www.rexnord.com/products/bearings/link-belt-spherical-roller-bearings/bearing-inserts-unmounted-replacements/a20000

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