Ceramic bearings are being seen about bicycles and different 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 generally use steel inner and outer races, with ceramic bearings between. Ceramic bearings can be purchased as loose ball bearings .
The ceramic bearing has found uses in commercial applications where there is substantial speed, large load, and, consequently, temperature. Bicycle riding easily does not cause high load, quickness or temperature. A bike moving at 80 kilometers each 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 could be described by various ratings, including the rating of ball roundness. A top quality steel ball bearing is normally consider grade 25. The grade quantity refers to the tolerance per millionth of an inch. A quality 25 is appropriate to 25/1,000,000 of an in .. Less costly ball bearings could be grade 300, which are fewer rounded, at 300/1,000,000 of an inch. Ceramic bearings could be grade 5, that is a rounder ball bearing. The importance of roundness, however, should not be overrated, as the bearing areas the balls operate on will be unlikely to always be as accurate as the standard of the ball bearing. The ball bearing is normally not the “weak link” in the machine.
Another facet of the bearing may be the property of the material. There is a rating for hardness referred to as the Rockwell scale. Steel uses what is known as the Rockwell C scale, and ball bearings will be of training hard. This hardness allows them to rotate rather than put on, at least for a while. The bearings floors of the hub cone and glass typically have a Rockwell C ranking 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 compared to the steel races. This should provide good wear features for the entire bearing system, not simply the ball bearing itself.
The surface finish of a bearing is also important. Ceramic bearings aren’t necessarily smoother than metal balls. In the image below, a Grade 25 metal bearing is magnified 200 circumstances . Grind marks are obvious. In the next picture, a ceramic bearing also show grind marks .
The ceramic material used in a ball is made of a grain structure, similar to a steel ball bearing . A significant property 
of any materials is “stiffness.” That is a measure of how it deflects under stress or load, and the rating of this property is named the “Modulus of Elasticity.” A steel bearing will be maybe 30,000,000 pounds per square in .. Ceramic bearings made from silicon nitride can have a Modulus of Elasticity of 47,000,000 pounds per square in .. This extra stiffness means the balls will deflect a lesser amount of under load which will transfer energy better, proving a (little) savings. As the ceramic ball is about one-half the pounds of a steel ball the same size, it’s the stiffness that is important within their performance.
It terms of service, there is no unique procedure or process. Bearing could be cleaned and lubricated as regular. Loose ball bearings will be installed and adjusted as with metal 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 first. For many cartridge bottom bracket bearings, it’s important to carefully take away the a plastic-type material shield over the bearing. Use a seal pick to lift the rubber seal from the interior edge . Clean the bearing clean with a rag and then add grease. Press seal into place.
Build a Straightforward but Fun Steel Ball Bearings china Magnetic Gauss Gun a.k.a. Magnetic Rail Gun
The 3 items you will need are Cylinder Neodymium Magnets, Metal Balls and PVC Conduit for the road of the gun.