Gears, gears, gears!

by Stefano on 2017.10.16, no comments Want create site? Find Free WordPress Themes and plugins.

Number of teeth, N

How many teeth a gear has. In the case of worms, it is the number of thread starts that the worm has.

Helix angle, psi

The angle between a tangent to the helix and the gear axis. It is zero in the limiting case of a spur gear.

Pitch circle, pitch line

The circle centered on and perpendicular to the axis, and passing through the pitch point. A predefined diametral position on the gear where the circular tooth thickness, pressure angle and helix angles are defined.

Pitch diameter

The pitch diameter is a predefined diametral position on the gear where the circular tooth thickness, pressure angle and helix angles are defined. The standard pitch diameter is a basic dimension and cannot be measured, but is a location where other measurements are made. Its value is based on the number of teeth, the normal module (or normal diametral pitch), and the helix angle. It is calculated as:

d = N m / cos(psi)

Module

The module is the unit of size that indicates how big or small a gear is. Is expressed by the ratio of the pitch diameter and the number of teeth.

m = d / N

Center distance

The center distance a is the distance measured from the center of gear 1 reference circle to the center of gear 2 reference circle.

a = (d1 + d2) / 2 = (z1 + z2) m /2

References

https://en.wikipedia.org/wiki/Gear

Calculation of Gear Dimensions

http://fab.cba.mit.edu/classes/863.09/people/cranor/How_to_Make_(Almost)_Anything/David_Cranor/Entries/2009/10/12_Entry_1_files/module.pdf

Herringbone gears in Fusion 360

Fusion 360 add-in to generate helical gears, herringbone gears and alike

https://apps.autodesk.com/FUSION/en/Detail/Index?id=9029586664984391977&os=Mac&appLang=en

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