How do ball screws work?
A ball screw is a mechanical linear actuator that translates rotational motion to linear motion with little friction. A threaded shaft provides a helical raceway for ball bearings which act as a precision screw. As well as being able to apply or withstand high thrust loads, they can do so with minimum internal friction.
Ball Screw Types:
A ball screw consists of a threaded shaft and a nut, and either one can act as the traversing component. Ball screws work in a similar fashion to ball bearings, where hardened steel balls move along an inclined-hardened inner and outer race. The types of ball-screw applications vary widely, so there’s no definitive recommendation for the type and amount of lubrication needed. However, factors such as frequency of use, temperature, and viscosity are essential considerations for lubrication options. Rolled screws are manufactured in a process that uses rotating dies to deform round metal bars and generate a helical thread pattern. This is a cost-effective manufacturing method, but typically produces screws with lower accuracy, compared to ground screws. Some manufacturers do, however, produce highly accurate screws through tightly controlled rolling processes. To select the correct ball screw and nut for a specific application, engineers should consider design factors like loads, life expectancy, speed, length, and mountings. Application considerations include lubrication and environment. Here’s a closer look.
Several loading considerations impact ball-nut screws. For instance, static loads are generally straightforward and reach the maximum limit when screw and nut are loaded to their capacity without damage.Ground screws are made from a process by which a grinding wheel cuts screw threads into case-hardened material. As a result, lead accuracies are typically much tighter than in rolled screws. Ground screws are generally preferred over rolled versions in aerospace applications, because the seam formed close to the major diameter of the screw shaft is thought to have potential for crack propagation. Dynamic loads are thrust loads that, when applied to the ball nut and rotating screw assembly, result in a specific minimum life. Dynamic-load ratings for metric screws indicate a load in Newtons that can be carried for 1 million revolutionsBall screws handle both compression and tensile loads. Compression loads tend to compress or squeeze the screw axially, which can make screws bow out. Tensile loads, on the other hand, often stretch the screw axially. While compression loads can be more problematic, tensile loads may cause a screw to elongate and crack.
Ball Screw Dealer:
Find here online price details of selling Ball Screws. Get information of distributors, suppliers & dealers of Ball Screws for buying in India. How to Choose Right Ball Screw Dealer in India. PGS Technologies from Chennai, India is a dealers, supplier, wholesaler, distributor and exporter of THK, HIWIN ball screw Chennai, india at reasonable price. It is one of the prominent company dealing in Linear Motion products, THK Ball screws, Cam follower and Linear Bearing the company sine 7 Years.Â
To know more, visit Ball Screw Dealer India
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