Unique Bearings Earn an “A” in Circuit Board Testing Equipment Problem Checksum’s Analyst machine applies multiple probes to test the connections on the surface of computer circuit boards. The machine’s very light, spring-loaded contacts are mounted in a custom platen, which is accurately positioned by a scissor mechanism to ensure that its hundreds of test points are heavily loaded on the appropriate areas of the circuit boards. The Checksum engineers’ challenge was to find bearings that would operate in an oscillatory motion and carry a peak load of 2,700 pounds, with a minimum bearing life of 500,000 cycles. Corrosion resistance, maintenance-free life, low cost and ease of installation were also important. Solution Checksum had tried traditional ball bearings in its initial prototype, b

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