Guide to the Standards and Conventions of Graphic Representation Reference Document Cursus Series

The purpose of this book is to provide a structured, fully illustrated explanation of the basic standards and conventions governing technical drawing. The approach – one topic per page – is simple and effective, giving an overview of each topic addressed, and of the information provided, at a glance.

The Guide contains the basic definitions and conventions of technical drawing, the conventional shape description, sectional views, dimensioning, thread symbols and their specifications.

An essentially visual tool in a convenient spiral notebook format, the Guide is a compilation of techniques and instructions to help readers improve their skills in the graphic definition of objects, including products, components, and even buildings, in accordance with the standards and conventions of technical drawing. It is a concise, up-to-date reference manual, which fully conforms to the principal Canadian and international technical drawing standards.

Foreword

CHAPTER 1

Drawing Conventions and Practices

Instrumental Drawing vs. Sketching

Technical Lettering

Types of Lines and Line Thickness

Hidden and Center Line Conventions

CHAPTER 2

Conventional Shape Description

Multiview Projection

Systematic Arrangement of Views

Precedence of Lines

Isometric Drawing vs. Isometric Projection

Hidden Lines in Isometric Drawings

Graphic signature of Normal, Inclined and Oblique Surfaces

Structured Resolution Method for Problems with Two Complete Views

Curved surfaces

Types of Machined Holes

Intersections and Tangencies

Rough and Finished surfaces

Conventional Fillets, Rounds, and Runouts

CHAPTER 3

Sectional Views and Conventions

Obtaining a Section View

Standard Cutting-Plane Lines and Section Lining

Full section, Offset Section, Aligned section, and Half Section

Web in section View, Broken-Out section, Revolved Section and Removed section

Intersections and Conventional Breaks

CHAPTER 4

Dimensioning

Basic Rules for Dimensioning

Dimensioning Holes, Radii, Cylinders, and Bolt Circles

Contour Dimensioning: Size and Location Dimensions

CHAPTER 5

Thread Symbols and Specifications

Bolts, Screws, and Nuts Proportions

Unified Thread Symbols and Specifications

Metric Thread Symbols and Specifications

CHAPTER 6

Design and Working Drawings

Isometric Exploded Assembly Drawing

Detail Drawing

Assembly Drawing

Construction Drawing

Appendices

Decimal Equivalents of Parts of an Inch

Standard Scales Used in Drawings

Standard Drawing Sizes

American National Standard for Unified Thread and Tap Drill sizes

American National Standard for Metric Thread and Tap Drill Sizes

Guide to the Standards and Conventions of Graphic Representation

This booklet is primarily intended for undergraduate engineering students, but community college students and drafting trainees will also find it useful, as it can be used as a reference manual in any course requiring a knowledge of technical drawing. Professional engineers, as well as designers and draftsmen and women working in industry, will find it an excellent reference.