eli5, How can things like tankturrets and excavators spin?

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Is there not like a bunch of electronic components that would get twisted and ruined of they just kept spinning? Or is there a limit to how many rotations they can do before needing to counterspin?

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Anonymous 0 Comments

In excavators and aerial fire ladders a large stationary gear with a small planetary gear that rolls around it. So wish can add pics…

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