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mechanisms image - Coggle Diagram
mechanisms 
motors
gearbox [set speed,expensive]
stepper[expensive,used in CNC]
servo[high torque, rotates through 180]
3v motor[small , ideal for fan]
in line[ration 120:1 , cheap ,rotates 360 degrees, ideal for wheels]
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gears
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idler gear[used to change direction of rotation][used to fill in gaps between driver and driven gears
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worm and worm wheel[high torque,very slow]
cams and followers
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many shapes ,shape determines movement of follower
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