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  • Tolerancing helical springs
    it's not practical or cost effective to change it on the shop floor after setup. That leaves body diameter and coil count. But body diameter, especially for compression springs, generally have tight OD or ID specs. Coil-spring rate goes as the cube of diameter, which makes it highly sensitive to small
  • Envirometrics Avoids Toxic Pesticides to Save Trees
    hardwood trees," says Paul Martin of Envirometrics. "At the first hard frost the female worm starts crawling up the tree to lay her eggs in the canopy. In spring they hatch into small caterpillars which eat new leaves just as they're coming out. "

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