Ceramic bearings are being seen on bicycles and additional hobby equipment, such as fishing reels, slot cars, and roller blade wheels. Ceramic bearings are available in the majority of sizes of bike cartridge bearings. The cartridge bearings usually use steel internal and outer races, with ceramic bearings between. Ceramic bearings may also be acquired as loose ball bearings .
The ceramic bearing has found uses in professional applications where there is substantial speed, substantial load, and, consequently, high temperature. Bicycle riding basically does not bring about high load, swiftness or temperature. A bike shifting at 80 kilometers per hour (about 50 mph), will have hubs that rotate about 11 revolutions per second. An engine crank shaft, however, may turn at over 100 revolutions per second.
The quality of bearing can be identified by various ratings, including the rating of ball roundness. A high quality metal ball bearing is normally consider quality 25. The grade number refers to the tolerance per millionth of an in .. A grade 25 is exact to 25/1,000,000 of an inches. Less costly ball bearings may be grade 300, which are less circular, at 300/1,000,000 of an inch. Ceramic bearings may be grade 5, which is a rounder ball bearing. The importance of roundness, however, should not be overrated, as the bearing surfaces the balls operate on happen to be unlikely to become as accurate as the standard of the ball bearing. The ball bearing is normally not the “weak link” in the machine.
Another aspect of the bearing may be the property of the material. There is a ranking for hardness called the Rockwell scale. Steel uses what is referred to as the Rockwell C scale, and ball bearings will be of program hard. This hardness enables them to rotate rather than have on, at least for some time. The bearings surfaces of the hub cone and cup routinely have a Rockwell C ranking of 55 to 60. A metal ball bearing is likely to be over a Rockwell C of 60. A ceramic ball bearings can be a Rockwell C of 75, much harder compared to the steel races. This will provide good use features for the whole bearing system, not only the ball bearing itself.
The top finish of a bearing can be important. Ceramic bearings are not necessarily smoother than steel balls. In the picture below, a Grade 25 steel bearing is magnified 200 instances . Grind marks are apparent. In the next picture, a ceramic bearing likewise show grind marks .
The ceramic material found in a ball is made of a grain structure, similar to a steel ball bearing . An important property of any material is “stiffness.” This is a measure of how it deflects under stress or load, and the score of this property is called the “Steel Ball Bearings Modulus of Elasticity.” A metal bearing will be conceivably 30,000,000 pounds per square in .. Ceramic bearings made from silicon nitride can possess a Modulus of Elasticity of 47,000,000 pounds per square in .. This extra stiffness means the balls will deflect much less under load which will transfer strength better, proving a (little) savings. While the ceramic ball is about one-half the weight of a metal ball the same size, it’s the stiffness that is important within their performance.
It conditions of service, there is absolutely no special procedure or process. Bearing can be cleaned and lubricated as usual. Loose ball bearings will be installed and adjusted as with steel balls. Install bearings and completely cover with grease.
With cartridge bearings, it’s possible lift the seal and check the grease. Take away the spindle or axle initially. For many cartridge bottom level bracket bearings, it’s important to carefully take away the a plastic shield over the bearing. Use a seal choose to lift the rubber seal from the interior edge . Clean the bearing clean with a rag and then put grease. Press seal into place.
Build a Simple but Entertaining Magnetic Gauss Gun a.k.a. Magnetic Rail Gun

The 3 items you need are Cylinder Neodymium Magnets, Steel Balls and PVC Conduit for the path of the gun.