![]() ![]() ![]() Transverse module m t = Troubleshooting Gears : Explanation of Terminology Pitting Normal module ( m n ) = 4 Helix angle ( β ) = 15° Tooth depth (h) is the distance between tooth tip and the tooth root. Please see Figure 2.4 below for explanations for Tooth depth (h) / Addendum (h a) / Dedendum (h f). Introduced here are Tooth Profiles (Full depth) specified by ISO and JIS (Japan Industrial Standards) standards. Tooth depth is determined from the size of the module (m). Dimensions of gears are calculated based on these elements. Module (m), Pressure Angle (α), and the Number of Teeth, introduced here, are the three basic elements in the composition of a gear. They are counted as shown in the Figure 2.3. Number of teeth denotes the number of gear teeth. (Important Gear Terminology and Gear Nomenclature in Fig 2.2) Recently, the pressure angle (α) is usually set to 20°, however, 14.5° gears were prevalent.įig.2.2 Normalized Tooth Profile of Reference Pressure angle is the leaning angle of a gear tooth, an element determining the tooth profile. DP 8 is transformed to module as follows m = 25.4 / 8 = 3.175 Pressure Angle ( α ) ![]()
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