Q: Our front door faces the southwest and has a short overhang such that it takes a beating from the afternoon sun. We replaced our 36-by-80-inch wood-panel front door with a new fiberglass one. It ...

There are many industrial applications requiring linear motion, and for most applications, conventional belt or screw drives do just fine. But when loads need to move long distances (more than 40 ft), ...

Fundamental ball-screw technology hasn’t changed much since 1929 when Rudolph G. Boehm patented a device he called an “anti-friction” nut. The ability to smoothly and precisely move heavy loads is a ...

Planet Earth is spinning at a rate of 0.0007 rpm. Easy to calculate: One revolution per day, divided by 24 to get revs/hr and then by 60 to get revs/min = rpm. As for linear speed, it depends on where ...