TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of online ...

Friction-drives have been around for more than 100 years. Today, we're seeing a new generation of modern friction-drives emerge that make it easy and affordable to convert your traditional bike into a ...

The mechanized world is dominated by rotating shafts, each designed to turn at a particular speed and torque. On one end of the shaft, quite often, is an electric motor — the prime mover. On the other ...

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 ...

Gears make the industrial world go ’round. And RIT engineering faculty and doctoral students are working to keep them moving efficiently. Gears transmit the motion necessary to operate the equipment ...

The most reliable means for changing shaft speed remains a mechanical variable-speed transmission. These drives are used to provide a variable output speed from a constant-speed power source (as in a ...