01Lecture-p1-ch5 - Manufacturing and Production Processes...

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Manufacturing and Production Processes ENGR 3190U – Lecture 01 – part 1 Chapter 5 - Dimensions, Tolerances, and Surfaces 1. Dimensions, tolerances & related attributes 2. Surfaces: characteristic, texture, integrity 3. Tolerances/Surfaces and manufacturing processes
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Chapter 5 - Dimensions and Tolerances Factors that determine the performance of a manufactured product, other than mechanical and physical properties, include : Dimensions - linear or angular sizes of a component specified on the part drawing Tolerances - allowable variations from the specified part dimensions that are permitted in manufacturing
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Bilateral Tolerance Variation is permitted in both positive and negative directions from the nominal dimension Possible for a bilateral tolerance to be unbalanced; for example, 2.500 +0.010, -0.005 Figure 5.1 Ways to specify tolerance limits for a nominal dimension of 2.500: (a) bilateral
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Unilateral Tolerance Variation from the specified dimension is permitted in only one direction Either positive or negative, but not both Figure 5.1 Ways to specify tolerance limits for a nominal dimension of 2.500: (b) unilateral
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Limit Dimensions Permissible variation in a part feature size consists of the maximum and minimum dimensions allowed Figure 5.1 ‑ Ways to specify tolerance limits for a nominal dimension of 2.500: (c) limit dimensions
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Why Surfaces are Important Aesthetic reasons Surfaces affect safety Friction and wear depend on surface characteristics Surfaces affect mechanical and physical properties Assembly of parts is affected by their surfaces Smooth surfaces make better electrical contacts
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Metallic Part Surface Figure 5.2 A magnified cross‑section of a typical metallic part surface.
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Surface Texture The topography and geometric features of the
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