We’ve got mixed feelings about a new video from [AndysMachines] that details how he makes custom ball screws ... together — very clever! [Andy] also showed how the balls recirculate in the nut ...

Anyone who has ever pounded on a stuck bolt or used an impact wrench to remove a rusty nut knows that vibration really helps. Put that same joint into service and subject it to the right kind of ...

The bolts were just screws with straight sides and a blunt ... Using these completely random parts, he quickly put together a working musket. He had invented the concept of interchangeable parts.