![]() If weight of the long roller is a concern, that might be when you consider implementing a material with a higher stiffness-to-weight ratio such as aluminum 6061 or similar. I agree with that mild Aluminum won't exhibit particularly good strength properties, you're probably better off with a mild steel such as A36. Calculated stress is covered in the Beam Stress section of the article, maximum stress occurs at the points furthest from the beam's center line for a given bending direction. ![]() has described is a classic beam bending strength calculation, described in Wikipedia as Flexural Strength (but with a circular cross-section instead of rectangular), or more generally a simply-supported (or possibly fixed-support) Beam Bending problem. ![]()
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