Some mechanisms transform linear motion into rotary motion. Most of these mechanisms are reversible. They also transform rotary motion into linear motion.
Rotary-linear transformation
Wheel
Wheels are esssential parts of bicycles. They let us move more easily because they reduce our contact with the ground and decrease friction.
Rack and pinion mechanism
A rack is a bar with many teeth and a pinion is a gear with teeth that interlock with the rack.When the pinion rotates, the rack moves in a linear direction.
Nut and bolt mechanism
A nut and bolt mechanism transforms rotary motion into linear motion. A bolt or shaft with a spiral groove and a nut that turns around it.
Winch and crank mechanism
A winch is a cylinder that rotates around a horizontal axis. The crank increases the force and the winch transforms rotary motion into linear motion. This mechanism has the Law of the Lever.
Reciprocratin rotary-linear
The pedal mechanism of a bicycle transforms the reciprocating movements of our legs into continuous.
Crank and rod mechanism
The piston moves a rod forwards and backwards. This rod turns the first wheel. The second wheel turns because it is connected to the first wheel by annother rod.
Crankshaft mechanism
We can connect multiple rods to one shaft. The rods are connected to cranks, and the cranks are connected to the crankshaft.
Cam mechanism
A cam is an irregulary shaped device that rotates on a shaft. When the cam rotates, it pushes a special bar called a follower. The follower can move other parts or it can turn a switch on and off.
