What is the difference helical bevel gear vs helical worm gear?

What is the difference between helical bevel gear VS helical worm gear? Helical gear is the most commonly used gear in transmissions.

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90 Degree Gearbox, Right Angle Precision Gearbox Powerace, 54% OFF

Difference between bevel gear and worm gear

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What is the difference helical bevel gear vs helical worm gear?

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