CBSE Class 11 Engineering Graphics Development of Surfaces

Read and download CBSE Class 11 Engineering Graphics Development of Surfaces in NCERT book for Class 11 Other Subjects. You can download latest NCERT eBooks chapter wise in PDF format free from Studiestoday.com. This Other Subjects textbook for Class 11 is designed by NCERT and is very useful for students. Please also refer to the NCERT solutions for Class 11 Other Subjects to understand the answers of the exercise questions given at the end of this chapter

NCERT Book for Class 11 Other Subjects Development Of Surfaces

Class 11 Other Subjects students should refer to the following NCERT Book Development Of Surfaces in Class 11. This NCERT Book for Class 11 Other Subjects will be very useful for exams and help you to score good marks

Development Of Surfaces NCERT Book Class 11

Chapter 8

DEVELOPMENT OF SURFACES

8.1 INTRODUCTION

We brush our teeth daily but have you ever noticed the shape of packing box of tooth paste. Is it similar to a square prism? Let us open the box from its joints and lay down it on a plane surface. What do you observe? It is a piece of hard paper, having a rectangular shape with crease/folds on all bends. This shape is known as TRUE SHAPE of object/box and the process of unfolding of surfaces of a solid is called Development of Surfaces.

Can we take more examples? Yes, every packing box, birthday cap etc. can be opened up in the same way. Steel almirahs, buckets, storage vessels etc are bulky and complicated but these are also made up of sheet metal or plates from the TRUE SHAPE of objects. In this chapter, we are going to study about the development of surfaces to find out the true shape of objects required to produce the three dimensional object. The knowledge of development of surfaces not only gives us the model of the object but also helps in the estimation of costing and process of manufacturing i.e. blanking, stamping, pressing, welding, riveting etc.

8.2 DEVELOPMENT OF SURFACES

If the surface of a solid is opened out and laid on a plane surface. The true shape of the surface area of the solid is obtained. It is known as the development of that solid. The technique used in making a development from the orthographic views of a given object, is to find out the true shape of the surfaces and correct placement of one surface with respect to another adjacent element. “A development is a plane surface, which represents the unfolded surface of the object” Figure 8.1 explains the unfolding process of a cube to get its development. Fig. 8.1

8.3 METHODS TO DRAW DEVELOPMENT OF SURFACES

The group of developments, classified according to the type of surface involved to construct the development are as follows :-

1. Parallel line developments

2. Radial line developments

8.3.1 PARALLEL LINE (RECTANGULAR) METHOD

In this method development of surfaces of prisms and cylinders is drawn with the help of parallel lines. In this method the lateral surfaces of a solid are divided into a number of convenient rectangles. The true length of each of the side of the rectangles is found out from the orthographic views of the solid. Using these true lengths the rectangles are drawn, sequentially, one besides the other. Usually, as the height of the Front View and development is the same, the development is drawn in horizontal alignment with the Front View. The addition of two end surfaces to the lateral surface gives the complete development of the solid. Development of the cylinder is obtained by dividing the cylindrical surface into “equal” parts with the help of generators.

8.3.1.1 CUBE

The development of the surface of a cube consists of six equal squares of side equal to the edge of the cube.

Example 8.1 : Draw the development of surface of a cube of side 40 mm. 

Solution : Refer to fig. 8.2

Steps :

1. Draw the Front View and Top View of the cube.

2. Draw the base line in horizontal alignment to the Front View and on it draw four faces (i.e. squares) of the cube.

3. Draw two faces (squares) of the cube on the first and last face. Fig. 8.2


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CBSE Class 11 Categories of Reference Sources Description and Scope
CBSE Class 11 Computer Hardware used in Library Concepts
CBSE Class 11 Disaster Management Introduction
CBSE Class 11 Disaster Management Natural Hazards
CBSE Class 11 Engineering Graphics Circles Semi Circles
CBSE Class 11 Engineering Graphics Development of Surfaces
CBSE Class 11 Engineering Graphics Isometric Projection
CBSE Class 11 Engineering Graphics Lines Angles
CBSE Class 11 Engineering Graphics Orthographic Projection
CBSE Class 11 Engineering Graphics Orthographic Projections
CBSE Class 11 Engineering Graphics Sections Of Solids
CBSE Class 11 Engineering Graphics Special Curves
CBSE Class 11 Fashion Studies books
CBSE Class 11 Fashion Studies Elements of Design
CBSE Class 11 Fashion Studies Elements of Garment Making
CBSE Class 11 Financial Markets Commodities Market
CBSE Class 11 Financial Markets Financial Statement Analysis
CBSE Class 11 Financial Markets and Instruments
CBSE Class 11 Financial Markets Primary market
CBSE Class 11 Financial Markets Secondary Market
CBSE Class 11 Five Laws of Library Science
CBSE Class 11 Library Automation Software Main Features
CBSE Class 11 Library Information and Society
CBSE Class 11 Philosophy Buddhist Formal Logic
CBSE Class 11 Philosophy Categorical Syllogism
CBSE Class 11 Philosophy Elements of Symbolic Logic
CBSE Class 11 Philosophy Methods of Natural and Social Sciences
CBSE Class 11 Philosophy Mills Methods
CBSE Class 11 Philosophy Nyaya Theory
CBSE Class 11 Philosophy Observation and Experiment
CBSE Class 11 Philosophy Other Forms of Immediate
CBSE Class 11 Philosophy Science and Hypothesis
CBSE Class 11 Philosophy Square of Opposition
CBSE Class 11 Philosophy Terms
CBSE Class 11 Philosophy Terms and Propositions
CBSE Class 11 Philosophy The Nature and Subject matter
CBSE Class 11 Punjabi Textbook
CBSE Class 11 Reference and Information Sources
CBSE Class 11 Sanskrit Book Ritika
CBSE Class 11 Setting up and Running a School Library
CBSE Class 11 Theory of Cataloguing
CBSE Class 11 Theory of Classification
CBSE Class 11 Types of Libraries and their Role
NCERT Class 11 Graphic Design Development of Script
NCERT Class 11 Graphic Design Elements And Principles of Graphic Design
NCERT Class 11 Graphic Design Evolution in Reprography
NCERT Class 11 Graphic Design Glossary
NCERT Class 11 Graphic Design Indigenous Graphic Design And Culture
NCERT Class 11 Graphic Design Indigenous Graphic Design Practices
NCERT Class 11 Graphic Design Intoduction to Graphic Design
NCERT Class 11 Graphic Design Movable Metal Type to Digital Imaging
NCERT Class 11 Graphic DesignGraphic Art Design And Graphic Design
NCERT Class 11 Heritage Crafts Clay
NCERT Class 11 Heritage Crafts Crafts Heritage
NCERT Class 11 Heritage Crafts Jewellery
NCERT Class 11 Heritage Crafts Metal
NCERT Class 11 Heritage Crafts Natural Fibers
NCERT Class 11 Heritage Crafts Painting
NCERT Class 11 Heritage Crafts Paper Crafts
NCERT Class 11 Heritage Crafts Stone
NCERT Class 11 Heritage Crafts Textiles
NCERT Class 11 Heritage Crafts Theatre Crafts

Other Subjects NCERT Book Class 11 Development Of Surfaces

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NCERT Book Class 11 Other Subjects Development Of Surfaces

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