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How power screw works

  1. Mar 24, 2005 #1
    hi

    does anyone knows how a power screw works, illustrations would be helpful..
    thanks


    ss
     
  2. jcsd
  3. Mar 24, 2005 #2

    russ_watters

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    Staff: Mentor

    Do you mean the propeller of a ship?
     
  4. Mar 24, 2005 #3

    FredGarvin

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    It's the same principle as a regular screw...a wedge. What are you looking for?
     
  5. Mar 24, 2005 #4

    minger

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    If you're talking about say the propeller of a ship, then imagine an inclined plane sitting in a body of water. Then, just move it straight up through the water. The water will exert a force on the plane perpendicular to the plane. There will be two components of that force, one being in the x direction, a thurst load wanting to push the plane horizontally through the water.

    Just note that this is very simplified, I'm sure there are other effects, and there is probably a "stall" angle where for a given rpm, and angle, the screw won't want to produce any axial force (although I would think you could go with a higher angle on a screw than just a straight propeller). Anyways....
     
  6. Mar 24, 2005 #5

    FredGarvin

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    I think Stan is refering to a linear actuator type of power screw.
     
    Last edited: Nov 7, 2005
  7. Mar 24, 2005 #6

    minger

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    OOOOoooo, power SCREW, haha. I have like a week and halfs worth of Machine Design notes on Power Screws somewhere at home. I'll look later for them
     
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