They hold together everything from the most delicate watch to the largest bridge. The world is literally kept from coming apart by screws and bolts, and yet we don’t often give a thought to these ...

One of the six simple machines, a screw is nothing more than an inclined plane wrapped around a center pole. While today screws come in standard sizes, and typically are tightened by turning clockwise ...

Balls screws for linear motion come in a variety of styles, each with its own benefits and downside. Leadscrew assemblies or drives are widely used to generate linear motion. And you can get this ...

Ball screws and roller screws are widely used for high-force linear motion and are replacing fluid power devices. In general, these screw mechanisms generate linear motion by rotating either the screw ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

IN the Human Factor (vol. 6, No. 2) there is an interesting article by W. F. Watson, a working mechanic of thirty years' experience, describing the conflict between the duodecimal and decimal systems ...