A worm gear 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, Worm Gear Design Pdf 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.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.
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, lets 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). Worm Gear Design Calculation To Excel Plus 2007 CrackSelect the suitable module and its corresponding pitch from the following AGMA specified table: Module m (in MM) Pitch P (in MM) 2 -6.238 Worm Gear Calculation 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 Worm Gear Design Excel 16 50.625 20 62.832 Quicken personal plus 2007 crack reviews. Worm Gear Design Calculation To Excel Free As WellA few worm gear design calculator are available on web, and some of them are free as well. In the next worm gear box design calculation tutorial we will discuss the force analysis of a worm gear box. Spur Gear: If you have observed a spur gear application, you may have noticed that spur gear can be replaced by helical gear.
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