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Mechanisms - Coggle Diagram
Mechanisms
gears
chain and sprocket- rotates in same direction. strong 
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idler gear- to change direction, used to fill in gaps between driver and driven
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worm and worm wheel- high power, very slow.
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motors
high troque, rotates through 180- servo
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ratio-120:1, cheap, rotates 360 degrees ideal for wheels inline
expensive, used in CNC-stepper
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More mechanisms
Planetary gears
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Parent + Child Gears
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