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Screw (simple machine)

 
Screw (simple Machine)

 
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Screw (simple machine)
 
 
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A screw is one of the six simple machine
Simple machine

A simple machine is a mechanical device that changes the direction or magnitude of a force.In general, they can be defined as the simplest mechanisms that use mechanical advantage to multiply force....
s. All screws are helical
Helix

A helix is a special kind of space curve, i.e. a Differentiable manifold curve in three-space. As a mental image of a helix one may take the spring ....
 inclined plane
Inclined plane

The inclined plane is one of the original six simple machines; as the name suggests, it is a flat surface whose endpoints are at different heights....
s. A screw can convert a rotational force (torque
Torque

Torque is the tendency of a force to rotate an object about an axis . Just as a force is a push or a pull, a torque can be thought of as a twist....
) to a linear force and vice versa. The ratio of threading determines the mechanical advantage
Mechanical advantage

In physics and engineering, mechanical advantage is the factor by which a mechanism multiplies the force or torque put into it. Generally, the mechanical advantage is calculated as follows:...
 of the machine. More threading increases the mechanical advantage. A rough comparison of mechanical advantage can be done by taking the circumference of the shaft of the screw and divide by the distance between the threads.

A screw is a shaft with a helical groove or thread formed on its surface and provision at one end to turn the screw.






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Encyclopedia


A screw is one of the six simple machine
Simple machine

A simple machine is a mechanical device that changes the direction or magnitude of a force.In general, they can be defined as the simplest mechanisms that use mechanical advantage to multiply force....
s. All screws are helical
Helix

A helix is a special kind of space curve, i.e. a Differentiable manifold curve in three-space. As a mental image of a helix one may take the spring ....
 inclined plane
Inclined plane

The inclined plane is one of the original six simple machines; as the name suggests, it is a flat surface whose endpoints are at different heights....
s. A screw can convert a rotational force (torque
Torque

Torque is the tendency of a force to rotate an object about an axis . Just as a force is a push or a pull, a torque can be thought of as a twist....
) to a linear force and vice versa. The ratio of threading determines the mechanical advantage
Mechanical advantage

In physics and engineering, mechanical advantage is the factor by which a mechanism multiplies the force or torque put into it. Generally, the mechanical advantage is calculated as follows:...
 of the machine. More threading increases the mechanical advantage. A rough comparison of mechanical advantage can be done by taking the circumference of the shaft of the screw and divide by the distance between the threads.

A screw is a shaft with a helical groove or thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force. It can also be defined as an inclined plane wrapped around a shaft.

Screws come in a variety of shapes and sizes for different purposes.

Examples

  • Lead screws and ball screw
    Ball screw

    A ball screw is a mechanical device for translating rotational motion to linear motion. A threaded shaft provides a spiral raceway for ball bearings which act as a precision screw....
    s are specialized screws for translating rotational to linear motion.
  • Automated garage doors
    Garage door opener

    A garage door opener is a motorized device that opens and closes garage doors. Most are controlled by switches on the garage wall, as well as by remote controls carried in the garage owner's Automobile....
    , where a motor drives a long finely threaded shaft at relatively high speed and lifts the heavy door at a slower rate.
  • Archimedes' screw
    Archimedes' screw

    Archimedes' screw, the Archimedes screw, the Archimedean screw or the screwpump is a machine historically used for transferring water from a low-lying body of water into irrigation ditches....
     and worm gears are examples of this machine.


See also

  • Screw (disambiguation)
    Screw (disambiguation)

    The term screw may refer to:* Screw ** Archimedes' screw?a simple machine for transporting water to a higher elevation* Screw?threaded fastener related articles...
  • Screw
    Screw

    A screw is a shaft with a helix groove or screw thread formed on its surface and provision at one end to turn the screw. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force....
     - the threaded fastener
  • Archimedes' screw
    Archimedes' screw

    Archimedes' screw, the Archimedes screw, the Archimedean screw or the screwpump is a machine historically used for transferring water from a low-lying body of water into irrigation ditches....