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Is it worth designing your own components to mount a ball screw?

The general answer I would give anyone, working on any project, who asked this question: Should I buy commercially available, off-the-shelf (COTS) parts, or make my own? would be to always buy off-...
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How to design shafts and select bearings

1/ Why do we have motors with cylindrical shaft and others with a D shaped one ? Are there other shapes ? How do you chose the appropriate one ? I find shafts with D profile are better to transfer ...
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