Question

A gear and shaft with nominal diameter of 35 mm are to be assembled with a medium drive fit. The gear has a hub, with an outside diameter of 60 mm and an overall length of 50 mm. Specify dimensions with tolerances for the shaft and gear bore to achieve the desired fit. (40 points)

Answer 1

Given medium fit shaft with nominal size d= 35 mm Outside diameter 60mm l = 50mm Using book 'Mechanical designs by shigley, refer table: selection of International tolerance Grades: 'Metric series! and description of preferred fits Hence for H7156 Medium fit, tolerance Ad = ITG (0.016 mm) DD IT7C0.025 mm) grade For hole, Dman - DTAD = 35+0.025 = 35.025 Dmin =D= 35 mm For shaft, refer table Fundamental deviations for shafts Sf = 0.043 mm dt df + ad = 35 +0.043 +0.016 35.059 mm dmin d+ SF = 35+ 0. 043 = 35.043 mm dmane Mascimum interferance Sman - dmone - Dmin 35.059-35 0.059 mm Minimum interferance Swin = dimin - Dmane = 35.043 - 35.025 0.018 mm

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