Axial pitch is used as a basis for this design standard because:ġ) Axial pitch establisheslead which is a basic dimension in the production and inspection of worms Ģ) The axialpitch of the worm is equal to the circular pitch of the gear in the central plane andģ) Only one set of change gears or one master lead cam is required for a given lead, regardless oflead angle, on commonly-used worm-producing equipment. Pitches: Eight standard axial pitches have been established to provide adequate coverageof the pitch range normally required: 0.030, 0.040, 0.050, 0.065, 0.080, 0.100, 0.130, and0.160 inch. L = lead of a worm which is the distance any one thread advances in a single revolution.
P n = Normal circular pitch of worm and wormgear = Px cos λ = P cos ψ
Related Resources: gears Worm and WormGear Design Equations and CalculatorĮquations for American Standard Fine Pitch Worms and Wormgears
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