| 1. | Where \ beta is the helix angle for the gear.
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| 2. | The helix angle of a worm is not usually specified.
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| 3. | Two mating helical gears must have equal helix angle but opposite hand.
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| 4. | Naturally, the helix angle is the geometric complement of the lead angle.
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| 5. | The helix angle is measured in degrees.
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| 6. | In screws especially, the helix angle is essential for calculating torque in power screw applications.
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| 7. | Due to difficulties in forming the thread, helix angle greater than 30?are rarely used.
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| 8. | In helical and worm gears, the helix angle denotes the standard pitch circle unless otherwise specified.
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| 9. | They have teeth of the same or different helix angles, of the same or opposite hand.
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| 10. | It is the complement of the helix angle, and is used for convenience in worms and hobs.
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