Transmission of rotary motion between two cranks (pink and green).
The cranks have the same velocity V.
Velocity of blue bar: V/2
Crank length: a:
Stationary bearing distances: d + d
a = d
Classified list of 2100 videos in channel thang010146 (uploaded till 31 Dec. 2015) including pictures, brief descriptions and YouTube links:
2100 ANIMATED MECHANICAL MECHANISMS