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Engineering Graphics with AutoCAD® 2017 by James D. Bethune

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Chapter 9. Tolerancing

9-1 Introduction

Tolerances define the manufacturing limits for dimensions. All dimensions have tolerances either written directly on the drawing as part of the dimension or implied by a predefined set of standard tolerances that apply to any dimension that does not have a stated tolerance.

This chapter explains general tolerance conventions and how they are applied by using AutoCAD. It includes a sample tolerance study and an explanation of standard fits and surface finishes.

Chapter 10 explains geometric tolerances.

9-2 Direct Tolerance Methods

There are two methods used to include tolerances as part of a dimension: plus and minus, and limits. Plus and minus tolerances can be expressed in either bilateral or unilateral ...

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