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📐 Why are 14.5°, 20°, and 25° pressure angles commonly used in gears?

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Why are 14.5°, 20° and 25° pressure angles used commonly in gears? ...
I had seen mostly above mentioned angles has been used in gear systems and besides that there 17.5°, 22.5° Pressure Angle has been used but i am no...
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April 16, 2025 at 6:59 AM