Pictorial Drawings

Pictorial Drawings

Engineering Design and Presentation Introduction to Orthographic Projection or Multiview Drawings UNT in partnership with TEA. Copyright . All rights reserved. What are Multiview Drawings? Essentially every object has 6 sides that could be drawn.

UNT in partnership with TEA. Copyright . All rights reserved. 2 Question: What views do you think we draw? We only draw three (3) of the views because it would be redundant to draw, say the back, because its the same as the front. So we only draw the Top, Front, &

Right Side. UNT in partnership with TEA. Copyright . All rights reserved. 3 Why only draw these views? We only draw the views needed to fully show the shape of the object. Choose the view that shows the most information; that will be your Front View.

In some other countries, they do draw the left view; but, in general, you should draw the right side. Showing only these three views saves time, makes the drawing easier to understand, and its all you need to have to the object manufactured. UNT in partnership with TEA. Copyright . All rights reserved. 4

Why do we draw hidden lines? Hidden lines are used to show something that you cant see in that view, but you need to know where it is. Hidden lines need to be drawn correctly and uniformly so that they are easy to see. UNT in partnership with TEA. Copyright . All rights reserved.

5 What is difference between an orthographic projection and a drawing? The result of a orthographic projection is the multiview drawing. Surfaces of the object are shown in true size/dimension and/or shape. Follow all drafting and dimensioning rules for drafting like line types, correct tool usage, etc.

UNT in partnership with TEA. Copyright . All rights reserved. 6 Correct Layout? Correct layout shape should resemble the letter L. Start with the top, then front, & then

right side. UNT in partnership with TEA. Copyright . All rights reserved. 7 Points to Ponder: Pencil Point To Ponder: Why do you think we only use a pencil & not pens? Triangle Point To Ponder: Why do you only use a triangle and never a scale or

ruler for drawing straight lines? Draw LIGHT lines and go back to darken when done. Point To Ponder: Why do we do this? UNT in partnership with TEA. Copyright . All rights reserved. 8 Graph Paper: *Yes you will draw on this paper

UNT in partnership with TEA. Copyright . All rights reserved. 9 Now lets look at the TV Box that we made. UNT in partnership with TEA. Copyright . All rights reserved.

10 Count the # of squares for the FRONT View. UNT in partnership with TEA. Copyright . All rights reserved.

11 Measure 3.5 squares to right & left of the center mark. 3.5 3.5 UNT in partnership with TEA. Copyright . All rights reserved.

Line up bottom of triangle to get straight Vertical lines. 12 If you are drawing it right, the views lines measurements will all line up. Think the L format (Lined Up).

Use either triangle when drawing a line to keep it uniform & neat/straight. UNT in partnership with TEA. Copyright . All rights reserved. 13 UNT in partnership with TEA. Copyright . All rights reserved. 14

Repeat the process by looking at the Front View. Lightly draw what you see centered on the construction lines you drew already. It should look like this. UNT in partnership with TEA. Copyright . All rights reserved. Construction Line or Center Mark Top View

15 Project your lines over all ways. UNT in partnership with TEA. Copyright . All rights reserved. 16 Count the squares and LIGHTLY draw

them centered over the construction lines you already drew for the TOP view. UNT in partnership with TEA. Copyright . All rights reserved. 17

UNT in partnership with TEA. Copyright . All rights reserved. 18 Construction Line or Center Mark Top View Looking at the Top View, lightly draw what you see centered on

the construction lines you drew already. It should look like this. UNT in partnership with TEA. Copyright . All rights reserved. 19 And RIGHT SIDE views. UNT in partnership with TEA. Copyright . All rights reserved.

20 UNT in partnership with TEA. Copyright . All rights reserved. 21 Repeat the process by looking at the Right Side View, lightly draw what you see so that it fits in the box.

Think connect the dots to finish it up. It should look UNT in partnership with TEA. Copyright . All rights reserved. 22 Should look like this, LIGHT LINES! UNT in partnership with TEA. Copyright . All rights reserved.

23 Draw Projection Lines to meet the angle line. Then draw straight down. Construction Line or Center Mark Top View Do the same for the horizontal lines in the Front View.

UNT in partnership with TEA. Copyright . All rights reserved. 24 This is what it will look like if you did it right. ALL lines are light! See how the views line up and

meet. That means less measuring and work for us! L Format (Lined Up). UNT in partnership with TEA. Copyright . All rights reserved. 25 Then Darken in the Visible/Object

Lines UNT in partnership with TEA. Copyright . All rights reserved. 26 NEAT & PRINTED Title Block Text! UNT in partnership with TEA. Copyright . All rights reserved. 27

Make sure that you Dimension EACH of your drawings! Because when you remove the master graph paper, you will need know these sizes for future use! UNT in partnership with TEA. Copyright . All rights reserved. 28

If you have done it correctly it will look like this. UNT in partnership with TEA. Copyright . All rights reserved. DARKEST, make your Border / Title Block / Picture Frame the darkest

line! UNT in partnership with TEA. Copyright . All rights reserved. Now, grade yourself using the rubric on each paper. Notice how the points change. The points given is the MAX you could receive for each problem. I will be going back and checking these. I will adjust as needed, so be HONEST! Otherwise, the score drops auto 5 pts if you give yourself, say 25 pts, when you only deserve 22 pts.

3 2 4 4 5 22 UNT in partnership with TEA. Copyright . All rights reserved. 31

Remember to. Always darken in your titleblocks border. Always neatly letter your text. Complete the self assessment rubric, your teacher will double check this. Tomorrow you will draw more complicated multiviews but with less instructions just examples shown. UNT in partnership with TEA. Copyright . All rights reserved.

32 Textbook Texas approved publishers are: Goodheart-Willcox Delmar Learning Prentice Hall All have a companion workbooks with more problems. I recommend using it or any other approved textbook, i.e., if you

are ATC or TechPrep and must teach using local colleges textbook. UNT in partnership with TEA. Copyright . All rights reserved. 33

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