maszyny: Ball bearing

Evidence: 100 • authority: 72

Evidence: 69 • authority: 72

In mechanical engineering, a rolling-element bearing, also known as a rolling bearing, is a bearing which carries a load by placing rolling elements (such as balls, cylinders, or cones) between two concentric, grooved rings called races. The relative motion of the races causes the rolling elements to roll with very little rolling resistance and with little sliding. One of the earliest and best-known rolling-element bearings is a set of logs laid on the ground with a large stone block on top. As the stone is pulled, the logs roll along the ground with little sliding friction. As each log comes out the back, it is moved to the front where the block then rolls onto it. It is possible to imitat…

Evidence: 60 • authority: 72

Evidence: 43 • authority: 72

A fidget spinner or hand spinner is a fidget toy composed of a central ball bearing and two or more weighted lobes that rotate around the central axis when spun. Typically made of plastic or metal, the toy operates on basic mechanical principles such as angular momentum and low-friction motion, allowing it to spin smoothly and for extended periods. The toy rose to widespread popularity in 2017, and was marketed as a variety of uses, including stress relief and support for individuals with attention-related conditions. Although some proponents claimed therapeutic benefits for conditions such as attention deficit hyperactivity disorder (ADHD) and autism, empirical studies have not substantiat…

Evidence: 43 • authority: 80

Evidence: 43 • authority: 80

Evidence: 43 • authority: 92

Evidence: 43 • authority: 72

Evidence: 43 • authority: 72

Bearing balls are special highly spherical and smooth balls, most commonly used in ball bearings, but also used as components in things like freewheel mechanisms. The balls themselves are commonly referred to as ball bearings. This is an example of a synecdoche. The balls come in many different grades. These grades are defined by bodies such as the American Bearing Manufacturers Association (ABMA), a body which sets standards for the precision of bearing balls. They are manufactured in machines designed specially for the job. In 2008, the United States produced 5.778 billion bearing balls.