Third angle orthographic projection pdf

Draw 3 Standard Orthographic Views

ORTHOGRAPHIC

VIEWS

ENGR 103 – Day 3

Day 3 – Student Outcomes

Students should be able to:

• Identify the 6 principal views of an object

• Create missing and properly orientate principal views

• Identify and create only the number of views required

• Identify and use line types with the correct precedence

(visible, hidden, center, leader, and dimension)

• Create Orthographic views from Isometric drawings

• Distinguish 1st angle and 3rd angle projection

Unfolding the Glass Box

http://www.boeingconsult.com/tafe/dwg/dwg1/2d-iso.htm

Glass Box Unfolded = 6 Principal Views

Glass box animation:

http://www.engineering

essentials.com/ege/ort

ho/ortho_page3.htm

http://www.engineeringessentials.com/ege/ortho/ortho_page3.htm
Necessary Views

The top, front, and right-side views, arranged together,

are called the three regular (or primary) views

because they are the views most frequently used.

A sketch or drawing should contain only the views

needed to clearly and completely describe the object.

http://www2.wisd.net/archive/industrialtech/DRAFTING/orthographicprojection.htm

Detail Drawings for Fabrication or Assembly,

the 3 Standard Orthographic Views are Typical

http://www.idrawdreamsforinventors.com/technical-drawings/#!

Two View Drawings

3D CAD Generated

View of Pulley

Side ViewFront View

Why is a

Top view not

needed?

One View Drawings

Sometimes, a single view supplemented by a note or by

lettered symbols may be enough.

https://www.google.com/search?site=&tbm=isch&source=hp&biw=1521&bih=1043&q=spindle+drawing&oq=spindle+drawing&gs_l=img.3..0.5921.13680.0.14068.15.9.0

.6.6.0.27.215.9.9.0....0...1ac.1.64.img..0.15.216.U6DLD0j5i30#imgrc=l_dCRrYey7upFM%253A%3BbXScllp3oqIINM%3Bhttp%253A%252F%252Fwww.speedyblock.co

m%252Fpublic%252Fscheda-tecnica%252FPuntale_testa_esagonale_con_2_dadi.jpg%3Bhttp%253A%252F%252Fwww.speedyblock.com%252Fd-inox-toggle-

clamps_Stainless-steel-series-Hex-head-spindle-assembly-fitted-with-2-hex-nuts_111_en.html%3B311%3B225

First-Angle and Third-Angle Projections

http://www.boeingconsult.com/tafe/dwg/dwg1/2d-iso.htm

Third angle projection symbolFirst angle projection symbol

First quadrant

Fourth quadrant

Second quadrant

Third quadrant

Example

Principal (basic) Views

Front View

Right Side View

Top View

• The 3 Basic Orthographic views • Front (Profile)

• Right Side

• Top (Plan)

• Aligned with each other

• Width in top and front views

• Height in front and side views

• Depth in side and top views

• Project • Horizontally

• Vertically

• “Around the corner”

Rules for Placement on Page

http://www2.wisd.net/archive/industrialtech/DRAFTING/orthographicprojection.htm

Top View 45⁰ miter line

Techniques of Lines Line Patterns

http://avstop.com/ac/Aviation_Maintenance_Technician_ Handbook_General/images/fig2_23.jpg

https://engineerharry.wordpress.com/category/main/education/seneca/tool-design/

Precedence of Lines

• A visible line always takes precedence over

and covers up a centerline or a hidden line

when they coincide in a view (A and B).

• A hidden line takes precedence over a

centerline (C).

Hierarchy:

1. Visible line 2. Hidden line 3. Center line

In Class - Exercise #1

On engineering paper, draw the 3 views needed from the

isometric image

In Class - Exercise #1 Solution

In Class - Exercise #2 On engineering paper, draw the 3 views needed from the

isometric image

In Class - Exercise #2 Solution

In Class - Exercise #3 On engineering paper, draw the 3 views needed from the

isometric image

In Class - Exercise #3 Solution

In Class - Exercise #4 On engineering paper, draw the 3 views needed from the

isometric image

In Class - Exercise #4 Solution

In Class - Exercise #5 Solution

To do list: 1) Reading:

 http://www.me.umn.edu/courses/me2011/handouts/drawing/blanco-tutorial.html (this

time focus on the bit about isos)

 http://teched.gpvanier.ca/drafting/draft11-12/9-isometric-drawings.pdf (directions on

how to draw in iso, you may find the bit about drawing circles especially helpful)

 http://www.ucl.ac.uk/drawing-gym/video/film-2-isometric-drawing/ (this video calls

the 3 views differently and is focused on architecture, but shows some good

examples of drawing isometric views)

2) Graphics Assignment: Ortho plates # ? Due Monday, 8/31/15  This will be passed out in class. If you are not in class, you MUST get a copy from

your instructor. The plates will not be posted online.

 Sketch the Top, Front and Right side views of the object drawn in the isometric view.

Use the corner marked with • for orientation.  Neatly complete the information on the back and in the title box of the sketch.

 Do NOT fold, staple, deform the sheet in any way!

3) From the “isometric paper” files posted in Blackboard, print out and

bring 4-5 copies of ¼ inch and ½ isometric paper to the next class.

http://www.me.umn.edu/courses/me2011/handouts/drawing/blanco-tutorial.html
http://teched.gpvanier.ca/drafting/draft11-12/9-isometric-drawings.pdf
http://www.ucl.ac.uk/drawing-gym/video/film-2-isometric-drawing/
To do list: 4) Homework: Draw on engineering paper the 3 standard orthographic

views for these 3 isometric drawings. Make sure they are lined up

correctly and use the different types of lines correctly. Use a scale of

1 square: 1 square. Due Wed, 8/26/15.