tailieunhanh - MACHINERY'S HANDBOOK 27th CD 2 Episode 10

Tham khảo tài liệu 'machinery's handbook 27th cd 2 episode 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Guide to Machinery s Handbook 27th Edition TOLERANCES AND ALLOWANCES 105 Fig. 9. Correct Dimensioning if Length of Body and Length of Stem Are Most Important Fig. 10. Correct Dimensioning if Length of Body and Overall Length Are Most Important Copyright 2004 Industrial Press Inc. New York NY Guide to Machinery s Handbook 27th Edition 106 TOLERANCES AND ALLOWANCES Fig. 11. Correct Dimensioning if Overall Length and Length of Stem Are Most Important If three different plants were manufacturing this part each one using a different sequence of operations it is evident from the foregoing that a different product would be received from each plant. The example given is the simplest one possible. As the parts become more complex and the number of dimensions increases the number of different combinations possible and the extent of the variations in size that will develop also increase. Fig. 9 shows the correct way to dimension this part if the length of the body and the length of the stem are the essential dimensions. Fig. 10 is the correct way if the length of the body and the length overall are the most important. Fig. 11 is correct if the length of the stem and the length overall are the most important. If the part is dimensioned in accordance with Fig. 9 Fig. 10 or Fig. 11 then the product from any number of factories should be alike. PRACTICE EXERCISES FOR SECTION 12 See Answers to Practice Exercises For Section 12 on page 228 1 What factors influence the allowance for a forced fit 2 What is the general practice in applying tolerances to center distances between holes 3 A 2-inch shaft is to have a tolerance of inch on the diameter. Show by examples three ways of expressing the shaft dimensions. Copyright 2004 Industrial Press Inc. New York .

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