Lesson 1.2 – Introduction to Technical Sketching and Drawing

Lesson 1.2 – Introduction to Technical Sketching and Drawing

Concepts

1.      Engineers create sketches to quickly record, communicate, and investigate ideas.

2.      Pictorials and tonal shading techniques are used in combination to give sketched objects a realistic look.

3.      Designers use isometric, oblique, perspective, and multiview sketching to maintain an object’s visual proportions.

4.      A multiview projection is the most common method of communicating the shape and size of an object that is intended for manufacture.

Performance Objectives

It is expected that students will:

·         Identify, sketch, and explain the function of points, construction lines, object lines, and hidden lines.

·         Plot points on grid paper to aid in the creation of sketches and drawings.

·         Explain the concepts of technical sketching and drawing.

·         Sketch an isometric view of simple geometric solids.

·         Explain how an oblique view of simple geometric solids differs from an isometric view.

·         Sketch one-point, two-point, and three-point perspectives of simple geometric solids.

·         Describe the concept of proportion as it relates to freehand sketching.

·         Sketch multiview drawings of simple geometric solids.

·         Determine the front view for a given object.

Essential Questions

1.      Why is sketching an important engineering skill? 

2.      What is the difference between sketching and drawing?

3.      What does the term isometric sketch mean?

4.      What does the term oblique sketch mean?

5.      What is perspective sketching?

6.      What advantages do pictorial drawings have over multiview drawings?

7.      What are the three main views of a sketch or drawing that are required to depict an object?

8.      Why should you not erase construction lines?

9.      If you are given an object with an unknown function and told to create a sketch of it, how would you determine what the front view would look like?

10. What is orthographic projection?

Key Terms

Instructional Resources

PowerPoint^Ò Presentations

Line Conventions

Isometric Pictorials

Oblique Pictorials

Perspective Sketches

Multiview Sketching

Word Documents

Activity 1.2.1 Isometric Sketches

Activity 1.2.2 Oblique Sketches

Activity 1.2.3 Perspective Sketches

Activity 1.2.4 Multiview Sketches

Lesson 1.2 Key Terms and definitions in Excel

Isometric graph paper

Orthographic graph paper

Activity 1.2.1 Isometric Graph Paper

Reference Sources

Bevlin, M., (1994). Design through discovery (2nd ed.). Belmont, CA: Wadsworth Group/Thomson Learning.

Ching, F., (1998). Design drawing. New York, NY: Van Nostrand Reinhold.

Giesecke, F. E., Mitchell, A., & Spencer, H. C., Hill, I.L., Dygdon, T. J., Novak, J. E., (2000). Technical drawing, (11th ed.). Upper Saddle River, NJ; Prentice Hall Inc.

Goetsch, D. L., Chalk, W. S., Nelson, J. A., & Rickman, R.L. (2005). Technical Drawing, (5th ed.). Clifton Park, NY: Thomson Delmar Learning.

International Technology Education Association, (2000). Standards for technological literacy. Reston, VA: ITEA.

Jefferies A., Madsen, D. A., (2004). Architectural Drafting and Design (4^th ed.). Albany, NY: Delmar Thomson Learning, Inc.

Lockhart, S., & Johnson, C. (2000). Engineering design communication. Upper Saddle River, NJ: Prentice Hall.

Madsen, D., Folkstead, J., Schertz, K., Shumaker, T., Stark, C., & Turpin, J., (2002). Engineering drawing and design (3^rd ed.). Albany, NY: Delmar Thomson Learning, Inc.

National Council of Teachers of English (NCTE) and International Reading Association (IRA) (1996). Standards for English language arts.

National Council of Teachers of Mathematics (NCTM). (2000). Principles and standards for school mathematics. Reston, VA: Author.

National Research Council (NRC). (1996). National science education standards. Washington, D. C.: National Academy Press.

Project Lead The Way, Inc. (2000). Introduction to engineering design curriculum. Clifton Park , NY: Project Lead The Way.

Spencer, H., & Dygdon, J., (1980). Basic technical drawing. Peoria, IL: Macmillan/McGraw-Hill.

Wallach, J., & Wallach, P. R., (1989). Drafting (2^nd ed.). Peoria, IL: Glencoe/McGraw Hill.

Wallach, Paul. R., (2003). Fundamental of modern drafting. Albany, NY: Delmar Thomson Learning, Inc.