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Gmb Associates
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Since Jul 2007
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Helical Gears
Posted on: October 25, 2008
Expires on: October 24, 2013
Helical Gears
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Boston helical gears are stocked both right and left hand, made with a 45° helix angle. They are designed to transmit motion and power between nonintersecting shafts which are positioned either parallel (opposing hand) or at 90° to each other (same hand). Because these gears are top-hobbed, there is extremely close concentricity between the pitch diameter and the outside diameter.

Helical gears offer additional benefits relative to Spur Gears, those being:
– Improved tooth strength due to the elongated helical wrap-around.
– Increased contact ratio due to the axial tooth overlap.
– Helical Gears tend to have greater load carrying capacity than Spur Gears of similar size.
– Because of the above, smoother operating characteristics are apparent.

All Boston Helicals are cut to the Transverse Diametral Pitch System, resulting in a higher Normal Diametral Pitch Number.

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