Ball Screw Information

A ball screw is a mechanism that can translate rotational motion into linear motion. This happens without much friction, energy loss through frictional effects is kept to a minimum. Similarly the ball screw apparatus becomes worn less quickly. A ball screw is typically of a greater size than a lead screw, as there is a mechanism contained inside the ball screw nut casing.

The interior of a ball screw consists of some solid metal ball bearings which travel down the pathways or threads ground into the surface of the barrel.
A crucial consideration is to make sure that it is impossible for particles of dirt to get into the interior of the ball screw. The metal balls inside the mechanism have to be able to travel through the threads and any tiny speck of dust can affect their smooth motion. Ball screws are known to have long lifespans, and for providing high levels of accuracy. Unfortunately these advantages will be hindered if dirt enters the barrel,  most occur have in Agricultural Machines. To prevent this the ball screw builders are careful to use bellows and other methods in order to ensure that no miniature obstructions stiking inside the ball screw nut.
Ball screws have a reputation of being extremely accurate as they are manufactured to close tolerances. That is why they are used in areas that require high levels of precision, such as in robots, aircraft and missiles. They can also be found in steppers, which are essential components of semiconductor production.
Often ball screws have the ability to functions backwards, a process known as back-driving. This means that instead of inputting rotational motion and achieving a linear output, the machine can instead input linear motion and obtain rotational motion. This is possible because of the low friction in the interior of the apparatus, which prevents the components from jamming.

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