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If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, the formative number of teeth is written as

If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, the formative number of teeth is written as Correct Answer T sec3 φ

The formative or equivalent number of teeth for a helical gear may be defined as the number of teeth that can be generated on the surface of a cylinder having a radius equal to the radius of curvature at a point at the tip of the minor axis of an ellipse obtained by taking a section of the gear in the normal plane. Mathematically, formative or equivalent number of teeth on a helical gear, T sec3 φ

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If T is the actual number of teeth on a helical gear and $$\varphi $$ is the helix angle for the teeth, then formative number of teeth is written as
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