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The new PE helical gearboxes from Stober Drives Inc., Maysville, Ky., handle more torque, generate less noise, and provide smoother motion than spur-gear units. The units come in four case sizes ranging from PE2 to PE5, and can have single or double stages with ratios from 3:1 to 100:1. Output torques range up to 310 Nm and inputs speed can be as high as 8,000 rpm. Backlash ratings are as low as 8 arc minutes.