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What’s a Ball Screw?

What’s a ball screw you say? Isn’t that a pitch no longer used by baseball players? No wait wait, I think I was served some drinks one time by that name. I recall waking up the next morning with a severe headache. Actually, those were screwballs, not to be confused with ball screws — as is commonly used on aircraft designs. Ball screws are a type of actuator which are typically used to drive aircraft components like flaps, slats, landing gears, doors and other control surfaces. In fact, ball screw actuators account for some of the deep "wrrrr" noises you hear in the cabin while on approach in many airliners. Typically those noises are the ball screws driving the flaps sequentially as yo

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