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CE En 112 Engineering Drawing with CAD Application Chapter 2: Sketching and Text (Lecture A) Lecture Outline Technical sketching (2.1) Sketching technique (2.2) Proportions and construction lines (2.3) Introduction to projections (2.4) Multiview sketching technique (2.5)

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CE En 112 Engineering Drawing with CAD Application

Chapter 2: Sketching and Text (Lecture A)

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Lecture Outline

  • Technical sketching (2.1)

  • Sketching technique (2.2)

  • Proportions and construction lines (2.3)

  • Introduction to projections (2.4)

  • Multiview sketching technique (2.5)

  • Multiview sketches (2.6)

  • Lettering (2.8)

  • Next class

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Technical Sketching (2.1)

  • The process of producing a rough, preliminary drawing representing the main features of a product

  • Generally less finished, structured, or restricted, and less time for its creation

  • Tools include pencil, eraser, and paper (grid or blank)

Means to create technical drawings

Level of detail of freehand technical drawing

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Technical Sketching (con’t)

  • Technical sketches: used extensively in the first (ideation) stage of the design process to explore and solidify design ideas that form in the mind’s eye

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Technical Sketching (con’t)

  • Transforming your ideas into tangible graphic images serves both as a permanent record of those ideas and as a means of encouraging creative thinking

  • What’s the difference between the two figures below?

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Technical Sketching (con’t)

Rough sketch

Multi-view sketch

Shaded sketch

Pictorial sketch

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Sketching Technique (2.2)

  • Sketching is based on the interactive process of seeing, imaging (forming structure and meaning of visual data), and representing (creating sketches of what our mind sees).

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Sketching Technique (2.2)

  • Practice Exercise 2.1 (p. 21)

    • Our perception is not limited to what we can see. Images often appear spontaneously in response to a memory recall. In this exercise, read the words and see if visual images are created in your mind’s eye.

  • Your bedroom where you grew up as a child, or the street you lived on.

  • A close relative, a famous actor, or a close friend from high school.

  • A basketball sitting at center court on your high school gym floor.

  • Your response to these written prompts is an example of your visual memory. You are thinking visually, which is a very powerful way of thinking when designing.

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Proportions & Construction Lines (2.3)

  • Proportion:

    • The ratio between two dimensions of an object

    • Represented by a series of preliminary (construction) lines, drawn light and fast, which may or may not represent the locations of the final lines in the sketch

    • The relative proportions of the primary dimensions of an object is more important than their actual physical sizes

      *Note: If a drawing doesn’t look or feel right, it probably isn’t

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Proportions & Construction Lines (con’t)

  • Example of relative proportions:

Standard proportions for the United States flag

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Proportions & Construction Lines (con’t)

  • Creating a proportioned sketch:

    • Step 1: Gage the proportion of the overall size of the object. Lightly draw construction lines to create a bounding box

    • Step 2: Inside bounding box, draw major features of object

    • Step 3: Continue to draw bounding boxes until all features are represented

    • Step 4: Begin sketching the final line work (dark)

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Introduction to Projections (2.4)

  • Projections: developed to represent 3-D images on 2-D media

  • Four basic types of projections:

    • Multiview

    • Axonometric

    • Oblique

    • Perspective

  • B, C, and D are pictorial because they represent the object as a 3-D form

More to come in future lectures…

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Multiview Sketching Technique (con’t)

  • Hidden line conventions must be followed in multiview sketching

  • Review these conventions and we will discuss them further in later lectures

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Multiview Sketches (2.6)

One-view, two-view, three-view sketches depending on the complexity of the object.

Refer to the text for the steps in determining which to use – we will also discuss more in later lectures…

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Multiview Sketches (con’t)

Three image planes

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Multiview Sketches (con’t)

  • Visualization Techniques:

Object – Image plane – The eye of the reviewer relationship

Horizontal, vertical, and depth

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Multiview Sketches (con’t)

Three types of faces:

1. Normal

2. Inclined

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Multiview Sketches (con’t)

2. Inclined

Inclined vs. Oblique faces:

Can you tell the difference?

3. Oblique

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Lettering (con’t)

Lettering dimensions:

Examples of lettering: