A screw joint is a one-
degree-of-freedom kinematic pair used in mechanisms.
Screw joints provide single-axis translation by utilizing the threads of a
lead screw
A leadscrew (or lead screw), also known as a power screw or translation screw,Bhandari, p. 202. is a screw used as a linkage in a machine, to translate turning motion into linear motion. Because of the large area of sliding contact between t ...
to provide such translation. This type of joint is used primarily on most types of
linear actuators and certain types of
cartesian robot
A Cartesian coordinate robot (also called linear robot) is an industrial robot whose three principal axes of control are linear (i.e. they move in a straight line rather than rotate) and are at right angles to each other. The three sliding jo ...
s.
A screw joint is sometimes considered as a separate type but it is actually a variation of
bolted joint. The difference is that a screw is used rather than a
bolt
The BOLT Browser was a web browser for mobile phones including feature phones and smartphones that can run Java ME applications. The BOLT Browser was offered free of charge to consumers and by license to mobile network operators and handset manuf ...
, thus requiring an internal thread in one of the jointed parts. This can save space, however, continuous reuse of the thread would probably damage the coils, making the whole part unsuitable.
See also
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Biological screw joint
The biological screw joint is a naturally occurring form of the screw joint, a mechanical device that combines rotational movement with single-axis translation. Alexander Riedel of the State Museum of Natural History Karlsruhe and Thomas van de Ka ...
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Cylindrical joint
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Degrees of freedom (mechanics)
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Kinematic pair
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Kinematics
Kinematics is a subfield of physics, developed in classical mechanics, that describes the Motion (physics), motion of points, Physical object, bodies (objects), and systems of bodies (groups of objects) without considering the forces that cause ...
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Mechanical joint
References
Kinematics
Rigid bodies
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