| 11. | A double helical gear can be thought of as two mirrored helical gears joined together.
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| 12. | Two main turbines were arranged in series and drove a shaft through double helical gears.
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| 13. | Previously, gears had been helical gears.
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| 14. | The term crossed helical gears has superseded the term " spiral gears ".
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| 15. | However, double helical gears are more difficult to manufacture due to their more complicated shape.
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| 16. | To machine a helical gear on a manual machine, a true indexing fixture must be used.
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| 17. | It applies to spur gears, parallel axis or crossed axis helical gears, and worm gearing.
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| 18. | The transmission included helical gear drive, a wet clutch, and a three-speed gearbox.
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| 19. | Helical gears connect parallel shifts but the involute teeth are cut at an angle to the axis of rotation.
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| 20. | Amongst South African electric locomotives, the Class 14E was the first to have solid wheels with helical gears.
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