Worm Gear Design Calculation Pdf
A 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. 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. We will use the AGMA formulae for doing the calculations.
How To Design Worm Gears
Design calculations of the other aspects of the worm gear will be discussed in a subsequent part of the tutorial. Steps of the Design Calculation. The axial pitch of the worm and the circular pitch of the gear must be same for a mating worm and gear.
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We will use the term Pitch (P) for both the pitch in this tutorial. Also, the module of the worm as well as the gear must be equal for a mating worm and gear. Now, let’s say we have the following design input: Speed of the Worm (N1) = 20 RPM Speed of the Gear (N2) = 4 RPM. 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). Select the suitable module and its corresponding pitch from the following AGMA specified table: Module m (in MM) - Pitch P (in MM) 2 -6.238 2.5 - 7.854 3.15 - 9.896 4 - 12.566 5 - 15.708 6.3 - 19.792 8 - 25.133 10 - 31.416 12.5 - 39.27 16 - 50.625 20 - 62.832.
Say, we are going ahead with the Module as 2 and the Pitch as 6.238.
KISSsoft 03/2013 – Tutorial 16 Analyzing the Geometry of Cylindrical Worm Gears double enveloping Worm Wheel KISSsoft AG. Call to the worm gear calculation.