Write an expression for the torque required to
work the screw-jack lifting a load W.
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n
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Jackscrew, also known for the screw jack or a worm screw jack, machine screw jack, lead screw jack like many names. This device is used to lift heavy loads with a comparatively smaller effort with a hand lever. It basically converts the rotary motion into linear motion with a screw and nut.
Screw Jack
As we said it used to lift heavy loads by applying relatively less effort with a lever. This mainly consists of a square threaded rod, nut, leaver and thrust collar head. The simple form of a screw jack is shown below.The square threaded rod is fitted into the nut(which is internally threaded with the same form as the screw rod. and the thrust collar is fitted on the top of the screw rod.
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