1. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 7 Sketching and Text in the Design Process

2. Design Process

3. 3 Methods of Creating technical drawings Technical Sketching evolution

4. TYPES OF SKETCHES Which one is which? Why? (A)Ideation Sketch (B)Communications Sketch

5. Why Sketching? Important method of quickly communicating design ideas Form of ______________. Solidify design ideas that form in our minds eye

6. Freehand Sketching Tools Grid paper (A)– help establish ______ and __________ Isometric Grid paper (B) Light table- tracing existing parts Blackboard resources Printfreegraphpaper.com

7. Proportions and Construction Lines Proportion- ratio between any two dimensions of an object –First Line Drawn=__________________ –Second Line Drawn =_______________ Construction Lines- Very Light, thin lines used to roughly lay out details of sketch or drawings –Preliminary lines –Not usually there in final sketch (box around circle) –Form backbone or structure wherein final line-work can be drawn –Assist in Projection

8. Steps to a Proportioned Sketch Which are Construction lines, and which are Proportion lines?

9. Creating Multi- view sketches Exercise

10. Most common solutions: Multi-view projection Isometric or Axonometric view Oblique View Perspective

11. 2 Major Categories or Projection Multi-View Sketches- Present object in a series of 2D projections that work together to provide all three dimensions Pictorial- Single pictorial view showing all 3 dimensions (W x H x D)

12. Any Guesses what the Minor Categories of Pictorial Projection are? Parallel Projection- True size and Shape (Solid works default) Perspective- Realistic view from eye with Vanishing points

13. Perspective Projection Principle Elements (GL) (HL) (VP)

14. Perspective projection gone wrong! Why not in Mechanical Design? Why is this not a problem with parallel projection?

15. Alignment is absolutely necessary to eliminate confusion

16. Steps to Determine Front View 1.Identify most descriptive or important features of object 2.Determine views that best represent those features 3.The normal orientation the object is typically seen or used 6 Principle Views

17. Chapter 7 Assignment Sketch figure 7.81 Numbers (6, 18, 47, 69) –Determine best 3 views to sketch using tools –Use mirror line and 3 rd angle projection –Use this template Fig 7.81 Grid Paper

18. Chapter 7 Assignment Sketch figure 7.82 Numbers (1,3,21,23) –Use this template –Create Isometric views using the standard three front, right, and top views. –All isometrics should go to right. Fig 7.82 Isometric Grid Paper

19. Line Conventions- Adhere to proper use of Alphabet of lines

20. Precedence of Lines What should you do if two lines coincide?

21. Hidden Line Conventions

22. Center Line Conventions How to represent circles, cylinders, arcs, radii

23. Centerline Standards

24. Steps to create Isometric Sketch Parallel Projection

25. Isometric Projection Exercise

26. Why Lettering in Sketches? Critical part of sketching 60% visual graphics 40% written form to convey idea Before CAD it is vital to understand correct idea being conveyed in sketches Making Toys Video Segment –How are sketching and text used to solidify the design?

27. Text All sketches contain text via notes or dimensions To communicate non graphic information Substitute for graphic info where text can communicate needed info more clearly and quickly (examples: 2X, Weld Symbols) ANSI Standards Inclined or Vertical

28. Example where is Text Used? Kept to a minimum

29. Mechanical ANSI Standards Use all Capital letters Use 1/8” for most text heights Use ¼” for height of fractions

30. Alphabet of lines assignment –Recreate this handout using sketching and text standards