7473 Hagers Hollow Dr.
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Bearings |
WHY THERE"S NO SUCH THING AS A 1/4" BALL 1) Three different bearings of the same size can have three different sized balls. Balls are not interchangeable from bearing to bearing. 2) Accidentally putting just one ball that is larger than the rest can spell disaster! It is extremely difficult to measure the differences with ordinary micrometers. 3) You cannot simply buy "a ball", either steel or ceramic and expect it to be the right size. So if you are in the market for assembled ceramics, it's all about ball quality and the "fit". To do it right takes a healthy assortment of ceramic balls, which adds up to a sizeable investment quickly. Everyone starts with a pre-made bearing, and the steel balls are simply swapped out with ceramics. Now there are an infinite number of possibilities of inner and outer race/ball combinations and each will require one particular ball size to meet the required tolerances. So having only three of any size category simply won't cut it. It takes more than that. Ceramic balls are expensive (good ones anyway), and this is an easy way to cut costs. So the next time you hear about a failed ceramic horror story, consider the above. Don't ask the bearing maker what type of balls they use, instead ask how many 1/4" balls they have in stock.. |
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