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Involute gear
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==Pressure angle== While any pressure angle can be manufactured, the most common stock gears have a 20Β° pressure angle, with 14Β½Β° and 25Β° pressure angle gears being much less common.<ref>Juvinall, R.C. and K.M. Marshek, 2006, ''Fundamentals of Machine Component Design'', 4th Ed, Wiley, {{ISBN|978-0-471-66177-1}}, p. 598</ref> Increasing the pressure angle increases the width of the base of the gear tooth, leading to greater strength and load carrying capacity. Decreasing the pressure angle provides lower [[backlash (engineering)|backlash]], smoother operation and less sensitivity to manufacturing errors.<ref>Boston Gear Company, Open Gearing Catalog, http://bostongear.com/products/open-gearing/stock-gears/spur-gears/spur-gears</ref>
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