Ceramic bearings are being seen upon bicycles and additional hobby equipment, such as for example fishing reels, slot cars, and roller blade wheels. Ceramic bearings can be purchased in the majority of sizes of bicycle cartridge bearings. The cartridge bearings usually use steel interior and outer races, with ceramic bearings between. Ceramic bearings can even be purchased as loose ball bearings .
The ceramic bearing has found uses in commercial applications where there is high speed, substantial load, and, consequently, high temperature. Bicycle riding simply does not bring about high load, rate or temperature. A bike shifting at 80 kilometers per hour (about 50 mph), could have hubs that rotate about 11 revolutions per second. An engine crank shaft, however, risk turning at over 100 revolutions per second.
The quality of bearing can be identified by various ratings, such as the rating of ball roundness. A top quality steel ball bearing is usually consider quality 25. The grade amount identifies the tolerance per millionth of an inch. A grade 25 is Steel Ball Bearings accurate to 25/1,000,000 of an inches. Less expensive ball bearings may be quality 300, which are much less round, at 300/1,000,000 of an inches. Ceramic bearings could be grade 5, that is a rounder ball bearing. The need for roundness, however, shouldn’t be overrated, as the bearing floors the balls run on will be unlikely to become as accurate as the grade of the ball bearing. The ball bearing is typically not the “weak link” in the machine.
Another facet of the bearing may be the property of the materials. There is a rating for hardness known as the Rockwell scale. Steel uses what’s referred to as the Rockwell C level, and ball bearings happen to be of study course hard. This hardness enables them to rotate rather than wear, at least for a while. The bearings floors of the hub cone and glass typically have a Rockwell C score of 55 to 60. A steel ball bearing is likely to be over a Rockwell C of 60. A ceramic ball bearings could be a Rockwell C of 75, much harder than the steel races. This will provide good use features for the whole bearing system, not only the ball bearing itself.
The surface finish of a bearing can be important. Ceramic bearings aren’t necessarily smoother than metal balls. In the photograph below, a Grade 25 steel bearing is magnified 200 situations . Grind marks are apparent. In the next image, a ceramic bearing as well show grind marks .
The ceramic material used in a ball is made from a grain structure, similar to a steel ball bearing . A significant property of any material is “stiffness.” This is a measure of how it deflects under anxiety or load, and the ranking of this property is called the “Modulus of Elasticity.” A steel bearing will be conceivably 30,000,000 pounds per square inch. Ceramic bearings made from silicon nitride can have a Modulus of Elasticity of 47,000,000 pounds per square inch. This extra stiffness means the balls will deflect a lesser amount of under load which will transfer energy better, proving a (tiny) savings. While the ceramic ball is approximately one-half the pounds of a metal ball the same size, it is the stiffness that’s important within their performance.
It conditions of service, there is absolutely no special procedure or process. Bearing could be cleaned and lubricated as typical. Loose ball bearings will be installed and adjusted much like steel balls. Install bearings and totally cover with grease.
With cartridge bearings, it’s possible lift the seal and check the grease. Remove the spindle or axle primary. For many cartridge bottom level bracket bearings, it is necessary to carefully remove the a plastic-type material shield over the bearing. Use a seal pick to lift up the rubber seal from the internal edge . Wipe the bearing clean with a rag and then add grease. Press seal into place.
Build a Simple but Fun 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.