Units include a robust aluminum housing in a compact and light-weight design. They are lubricated for life and may be mounted in any orientation (except M4) with the same amount of oil. Offering low gear ratios for high output speeds, their wear-free gears are said to minimize friction for optimal efficiency and create little noise. According to the company, the first stage helical gearing and the second stage hypoid gearing combination of the W37 & W47 Spiroplan provide high mechanical efficiency and low energy consumption compared to worm gear units.
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