Prepared by
J. John Shiny
Assistant Professor,
Information Technology,
Thiagarajar College of Engineering
Once engineers complete their initial design,
they begin to create solutions via
Analyze Designs
Choose Solutions
Communicating Solutions
Usage of Engineering Drawings for further
design of their ideas
Appropriate drawing ensure that designs
must be clear to managers, fellow team
members and customers
Created to communicate their products that
will be manufactured
Extremelydetailed and follow strict
standards-ANSI
Classified into
1. Detailed drawings
2. Assembly Drawings
3. Schematic Drawings
1. Detailed Drawings
Exact shape and size of an object with
dimensions
Similar to architecture diagram of a project
2. Assembly Drawings
How different parts fit together to create the entire
object
Exploded view drawings
Show the relationship between objects
Ex: Guide to Assemble and dissemble the parts of a car
3. Schematic Drawings
Entire system
How different parts are connected together to form a system
How parts of a system work together
Standard symbols
Helpful in diagnosing a system problems
Ex: Flow of electricity between different parts of the circuit
1.Orthographic Drawings
Multiple views to describe the shape and size of
an object
Developed as a rough sketch used to show the overall
view of the object
Created using orthographic projection
Visualization –ability to mentally see a representation of a
product
Classified into one view, two view and three view
1.1 One-view Drawings
Flat pieces
Top view
1.2 Two-view Drawings
Cylindrical objects and objects with round shape
Front and bottom or top view
1.3 Three-view Drawings
Rectangular objects
Front, top and side view
2.Pictorial Drawings
Similar to a direct view of an object
Used by people who do not understand
orthographic drawings
Classified into Isometric, Oblique, Perspective
drawings
2.1 Isometric Drawings
Drawn using standard angles
Dimensions must be accurate
2.2 Oblique Drawings
Highlight one side of the drawing
Front view
2.3 Perspective Drawings
Simulate what the eye sees if looking at the object
Vanishing point- spot at which receding lines converge
1.Symbols
Symbols are used to represent different entities
in drawing
Properties of a specific object
ANSI and ISO standards
2.Line types
Highlight different parts of design
Construction Line
Layout the drawing
Reference points- removed finally
Object Line _______
Outline and edges of the object
Hidden Line ----------
Show parts of the drawing that are hidden from sight
of view
Center Line __ _ __ _
Show the center point of an object
Border Line ________
Create a border around the edges of the paper
3.Scale
Drawing may be drawn at full scale(1:1) i.e all lines
on the paper are identical to the size of actual
product
Twice size of an actual object (2:1)
One quarter size of an actual object(1:4)
Depending on the size of the object and amount of
space on the paper
4.Dimensioning
Describe the size of the object and the Location
of different features in the design
Two different types of lines
Extension lines
Drawn every near edge of the object
Dimension lines
Drawn between extension lines and have arrows at
the end of each line
Three types of dimensions
4.1 Size Dimensions
Describe the length, width and depth of
an object
4.2 Location Dimensions
Show the distance between two different features
Length from the edge of an object to the center of a feature
4.3 Shape Dimensions
Detailed information about shape
of features
Show angles between different
features of the object
Dimensions should not be placed inside an
object
It should be placed between views
The location and size of all circles and arcs
must be shown
leader
Drawing Elements
Nomenclature
Drafting Practices
Types of Drawing
Drawing Revisions
Design References, Standards, and
Specification
The communication of solutions is important
to make clear design
Working Drawings
Drawing classification
Standard symbols
Line types
Dimensioning
Industry Guidelines
