| 21. | Nowadays, the drill bit is usually made by rotating the bar while moving it past a cutting helical gears.
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| 22. | It designs and manufactures worm drives, helical gears, spiral bevel gears as well as a range of couplings.
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| 23. | For both possible rotational directions, there exist two possible arrangements for the oppositely-oriented helical gears or gear faces.
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| 24. | Helical gears are sometimes used for the high-torque drives, typically the starter, as these give smoother running.
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| 25. | However helical gears also generate an end-thrust, which then requires a more complicated thrust bearing to support them.
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| 26. | Citro�n bought the patent for very little money, leading to the invention that is credited to Citro�n : double helical gears.
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| 27. | The first generation Saab 900, launched in 1978, also used a longitudinal engine with a transmission underneath with helical gears.
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| 28. | At the rear of the camshaft was cut a set of helical gear teeth, these being used to spin the distributor.
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| 29. | The 90-degree change of the drive plane that occurs at the bottom bracket and again at the crossed helical gears.
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| 30. | In its typical parallel arrangement, meshing helical gears requires that the helix angles are of the same magnitude and cut oppositely.
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