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Introduction to Manufacturing Processes 3rd Edition

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  • Step 1 of 3


    The dimensional difference between any two mating parts like hole and shaft for any type of fit is known as allowance. It is generally defined in terms of limits i.e. the difference between the lower limit of hole and higher limit of shaft. There two types of allowances namely:

    1. Clearance which is positive allowance and

    2. Interference which is negative allowance.

  • Step 2 of 3


    Dimensional or size variation of a part is known as tolerance. Thus with the help of tolerance worker can produce the part with small error. The zone where the error is permitted is the difference between the higher and lower limit of part and is known as tolerance zone. Thus even though the job produced is not accurate by providing the tolerance zone we can get rid of the functional problem due too small inaccuracy. Tolerance is generally shown in to two types of systems. They are:

    1. Unilateral system.

    2. Bilateral system.

  • Step 3 of 3


    Degree of tightness or looseness between any two mating parts is known as fit by which they are assembled. Fit is present either in a fixed joint or movable joint. Shaft and bearing comes under movable joint whereas pulley mounting to shaft comes under fixed joint. Generally according to the type of allowance fit is classified in to three types. They are:

    1. Clearance fit.

    2. Transition fit.

    3. Interference fit.

Corresponding Textbook

Introduction to Manufacturing Processes 3rd edition 9780070311367 0070311366
Introduction to Manufacturing Processes | 3rd Edition
9780070311367ISBN-13: 0070311366ISBN: John A ScheyAuthors: