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Design News, April 2013

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Automation & Control used in electrical applications. In addition, most ceramic balls bearings can operate in temperatures up to 1,800F. With these advantages, ceramic ball bearings are an attractive solution. However, these types of bearings are extremely expensive, which is a strong argument in itself for seeking out an alternative solution. Reliability in a Clutch ...a clutch, brake or power transmission part for that matter. Since 1903 Carlyle Johnson has solved some of history's toughest motion control challenges – it's what we love to do. Our precision electrical, mechanical, air and hydraulic power transmission products consistently prove reliable and dependable in every application. Underwater, on the ground and in the air, CJM is everywhere. Standard and Custom Clutch, Brake & Power Transmission Solutions 291 Boston Turnpike • Bolton, CT 06043 Phone: 860-643-1531 www.cjmco.com Polymer Ball Bearings While polymer ball bearings are a newer technology, they have advantages that are not offered by steel or ceramic ball bearings. Polymer ball bearings are comprised of all-plastic races and cage, but are typically available with a choice of three different types of balls: polymer, glass, or stainless steel. The choice of material is often dependent on the environment in which the bearing will be used. Polymer balls are best for applications where weight and noise are most critical, while glass balls boast less magnetic properties than 316 stainless-steel balls and are ideal when a metal-free solution is needed. Stainless-steel balls are the most cost-effective choice, but do weigh more than polymer and glass. However, compared to steel balls, they still offer a significant weight advantage. Whatever configuration, polymer ball bearings are ideal for applications with normal to high speeds and have a number of attractive features. Thanks to their plastic construction, polymer ball bearings are self-lubricating, corrosion-resistant, and deliver quiet operation. Another advantage is they are lightweight: While a ceramic ball bearing weighs about one-third of its steel counterpart, a polymer ball weighs the least out of all three types. However, there are instances where polymer ball bearings should not be used, including applications with high loads or long-term temperatures exceeding 300F. Every manufacturer offers its own versions of ball bearings with varying features. igus, for example, offers its line of xiros polymer ball bearings in three different thermoplastic race materials: iglide A500 for extreme chemical resistance and temperatures reaching 300F, iglide B180 for high wear resistance and temperatures up to 176, and iglide C160, which S18 A u t o m Atio n & Co ntR oL A p ril 2013 xiros B180 is a cost-effective FDAcompliant standard, offering a combination of extremely low wear rates and good chemical resistance. xiros pillow block bearings have a pivoting option allowing for the compensation of misalignment. xiros A500 is a premium product targeting extreme chemical and thermal resistance, excellent chemical compatibility (for FDA compliance etc), autoclavable, and increased precision. can also be used in chemically charged applications, but where the temperature remains 176F or lower. A manufacturer of steel ball bearings often offers its products in a number of different types of steel, including a 300 series (soft stainless), a 400 series, or chrome steel. Tom Miller is business unit manager for igus' line of bearings. For more information, go to www.igus.com. [www.designnews .com]

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