For thousands of years, gears have functioned with solid teeth to turn the wheels of the world, from chariots to clocks to ...

This article was updated March 6, 2023. It was originally published Aug. 1, 2001. Gears—even plastic ones—need to be lubricated if engineers are going to coax the best performance out of them. In the ...

HALT. DOUG MEEHAN TONIGHT HAS MORE IN MADE A MESS. WHAT YOU’RE LOOKING AT IS NOT YOUR NORMAL COG AND WHEEL GEAR SYSTEM, WHERE A REGULAR GEAR ROLLS IN THIS REVOLUTIONARY CONFIGURATION, THE GEAR TEETH ...