And, we have to find out the Module (m), Pitch (P), Number of helix of Worm (T1), Number of teeth of Gear (T2), Pitch circle diameter of Worm (D1), Pitch circle diameter of Gear (D2), Centre to centre distance(C).Now, let’s say we have the following design input: Speed of the Worm (N1) = 20 RPM Speed of the Gear (N2) = 4 RPM.Also, the module of the worm as well as the gear must be equal for a mating worm and gear.We will use the term Pitch (P) for both the pitch in this tutorial. The axial pitch of the worm and the circular pitch of the gear must be same for a mating worm and gear.Belajar Membaca Anak Tk Gratis on this page. We will use the AGMA formulae for doing the calculations.ĭesign calculations of the other aspects of the worm gear will be discussed in a subsequent part of the tutorial. Look at the picture below: Where, D1 – Pitch Diameter of Worm D2 – Pitch Diameter of Gear C – Centre to Centre Distance between the Worm and the Gear This worm gear design tutorial will discuss up to the selection of the module and pitch and the calculation of the number of teeth, pitch circle diameter and centre to centre distance between the worm and gear. Download Free Lecture Notes-Pdf Link-IX.Ī box must contain a worm and a mating gear (helical gear) and normally the axis of the worm is perpendicular to the axis of the gear.

Formulas for gear calculation - external gears. To design a gear tooth profile which rolls through the mesh without friction.

Worm gear design calculation pdf