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Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half. This means that herringbone gears can be used in torque gearboxes without requiring a substantial thrust bearing.
Construction drill auger. Wood augers have a screw to pull them into the wood, as a gimlet has, and a cutting lip that slices out the bottom of the hole. The auger bit, meant to be used in a brace, also has cutting spurs to cut a clean circle deeper than where the lips scrape out the wood. In construction, augers are used for special drilling rigs to dig holes, or augerating for deep foundation piles. Another use is for piles forming a piling retaining wall, which can be constructed in the same way as foundation piles. Augers â either gas- or hand-powered â are used by ice fishermen to drill holes to