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A 3D Picture Rigid Shaft Coupling

How to represent such complicated 3D objects on

2D Drawing sheets ?

The Answer is the Different Methods of

Engineering Drawing

The present show aims at demonstrating methods of

Engineering Drawing that are generally learnt by

students of diploma graduate engineering

students. Orthographic projection is one such

method

Orthographic Projection of the Rigid Shaft

Coupling shown in slide 1

What is Engineering Drawing

What is Engineering Drawing

Types of Lines

Curves Needed to Learn by Beginners

Involute

Curves Needed to Learn by Beginners

Archimidian Spiral

Types of Projections

Orthographic Projection

- The orthographic projection shows the object as

it looks from the front, right, left, top,

bottom, or back, and are typically positioned

relative to each other according to the rules of

either first-angle or third-angle projection. - The origin and vector direction of the

projectors, also called projection lines, differs.

Principal Planes Horizontal

Principal Planes Vertical

Principal Planes Profile

3 Principal Planes Combined

Rays of light

Projection of a Point

A

Rays of light

Projection of a Point

P

A

V

A

A

A

H

Projection on 3 principal planes

3 views of a point

Projection of a Line

A

B

Projection of an Oblique Line 3 Views

Projections of a Horizontal Line

A

B

Projection of a Frontal Line

AB is parallel to Front plane, called Frontal

Line. Other similar lines are Horizontal

Profile lines.

True lengths are obtained.

True lengths are obtained for these lines.

B

3 Views of a line Frontal Line

1st Angle Projection Solid

Projection of a solid

3 views of a solid 1st angle

PP

GL

Projection of a solid

Views in 4 Quadrants

Views in 4 Quadrants

No to lt2

Views in 4 Quadrants

Views in 4 Quadrants

No to lt4

3rd Angle Projection Solid

3rd Angle Projection

Multi-view Projections

Multi-view Projections

First Angle Third Angle conventions

1st Angle

3rd Angle

2 Views of a Cone

2 Views of a Hexagonal Prism

2 Views of a Solid

3 Views of a Solid

Sectional Views

Passing Sectional Plane

Object after section

Full Sectional Front View

Throw away the front part

A

A

A

Top View

Full Sectional F-View

Full Sectional Front View

Sectional F-View

F

T-View

Half Sectional Front View

Sectional F-View

T-View

Isometric projection

- The isometric projection show the object from

angles in which the scales along each axis of the

object are equal. - Isometric projection corresponds to rotation of

the object by 45 about the vertical axis,

followed by rotation of approximately 35.264

arcsin(tan(30)) about the horizontal axis

starting from an orthographic projection view. - "Isometric" comes from the Greek for "same

measure".

Isometric Projection

Isometric projections

- The projection is obtained on a plane which is

equally inclined to all three principal planes - Isometric projections and Isometric drawings are

represented on plane paper by drawing Isometric

axes, Isometric lines and Isometric planes.

Isometric projections

When a cube is kept in a particular position then

it gives Isometric axes, Isometric lines and

Isometric planes. Particular position When a

cube is resting on HP on corner G and diagonal EC

is perpendicular to VP.

CB, CD, CG meeting at C making an angle 120 deg

are Isometric axes. Lines parallel to Isometric

axes are isometric lines, planes representing the

faces are isometric planes.

Isometric Circle

Isometric Projection

Isometric Dimension

Cotter Joint

THANK YOU