The Epicyclic gearbox was devised in 1781 (as a sun and planet gear) by James Watt for use in conjunction with his steam engines. The concept was adopted in 1902 by Sturmey and Archer for a ...

A clock is perhaps one of the the most popular projects among makers. Most designs we see are purely electronic and do not bother with the often more complicated mechanical part. Instructables user ...

In bicycles, gears are required to couple the cyclist's output to the motion of the rear wheel. A selection of gear ratios is desirable to maintain a good impedance match between the cyclist and the ...