Bearings are an important part of contemporary machinery and equipment. Rolling bearings have four parts which are outer ring, inner ring, rolling element, and cage. 

The processing of the outer ring of the ball bearing people currently widely used in the centerless grinding of the outer diameter. And the use of the outer diameter support method to grind the raceway. 

1.Since they are both rings of steel, the process starts with steel tubing of an appropriate size. Automatic machines similar to lathes use cutting tools to cut the basic shape of the race, leaving all of the dimensions slightly too large. They can be machined back to their finished size after heat treating.

2. Put the rough cut races into a heat treating furnace at about 1,550 degrees Fahrenheit (843 degrees Celsius) for up to several hours (depending on the size of the parts), then dip into an oil bath to cool them and make them very hard. This hardening also makes them brittle, so the next step is to temper them. This is done by heating them in a second oven to about 300 degrees Fahrenheit (148.8 degrees Celsius). And then letting them cool in the air. This whole heat treatment process makes parts that are both hard and tough.

3. After the heat treatment process, the races are ready for finishing. However, the races are now too hard to cut with cutting tools. So the rest of the work must be done with grinding wheels. At this point, the races are finished, and ready to be put together with the bearing balls.