Teeth is required a value of D = 48mm is easily selected with number of teeth z =24 teeth. The number of teeth = D/m and as an whole number of Say a module of 2mm would have a PCD (D) of 50 - 2 = 48mm. The very simplest method of initially selecting of involute spline based on a shaft dia is toĪrrive at an initial Pitch circle dia (D) and a module (m). To control tolerances, the minimumĮfffective space width and the minimum major diameter of the internal spline are held to basic dimensions. Internal splines are formed by broaching or by a gear shaper. The external spline can be formed either by hobbing or by a gear shaper. Involute splines are the predominant form bacause they are stronger than straight sided splinesĪnd are easier to cut and the fit. It is emphasised that the splines identified are side fit with the centering based on the sides of the splines In accordance with BS ISO 4156:2005-1 Straight cylindrical involute splines. The notes and tables below relate to straight cylindrical involute splines Using the relevant standards or quality reference sources. The information on this page is not detailed and has been obtained by reference to It is also possible to become a BSI member and obtain copies of
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