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A mechanism is usually a piece of a larger process or mechanical system.
Multiple mechanisms are machines.
Mechanism
In engineering, a mechanism is a device that transforms input forces and movement into a desired set of output forces and movement.
“Constant-velocity joints (also known as homokinetic or CV joints) allow a drive shaft to transmit power through a variable angle, at constant rotational speed, without an appreciable increase in friction or play. They are mainly used in front wheel drive vehicles.
Helical or "dry fixed"
Since the gear is curved, this angling makes the tooth shape a segment of a helix.
https://www.youtube.com/watch?v=zae2ZePQTwQ
An epicyclic gear train
Learn More
The mechanism (see figure) includes an inner flat ring, an outer flat ring, and an even number of iris blades.
https://www.youtube.com/watch?v=bbp0SYEpjrg
https://www.youtube.com/watch?v=qGAnmRb66s0
"Magic" worm gears
https://www.youtube.com/watch?v=QhXjevOY_uk
Donut gears
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