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The normal lead, in a worm having multiple start threads, is given by

The normal lead, in a worm having multiple start threads, is given by Correct Answer lN = l . cos λ

The term normal pitch is used for a worm having single start threads. In case of a worm having multiple start threads, the term normal lead (lN) is used, such that lN = l . cos λ where lN = Normal lead, l = Lead, and λ = Lead angle.

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