Moving parts

For other uses, see Moving parts (disambiguation).

Machines include both fixed and moving parts. The moving parts have controlled and constrained motions.

The term excludes fluids that pass through the machine, such as fuel, coolant or hydraulic fluid, as well as mechanical parts (such as locks, switches, nuts, bolts, and screw caps for bottles) which are moved only to reconfigure the machine. A system with no moving parts is described as "solid state".

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