Ce en 112 engineering drawing with cad application
Download
1 / 26

CE En 112 Engineering Drawing with CAD Application - PowerPoint PPT Presentation


  • 354 Views
  • Uploaded on

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)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'CE En 112 Engineering Drawing with CAD Application' - benjamin


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Ce en 112 engineering drawing with cad application l.jpg

CE En 112 Engineering Drawing with CAD Application

Chapter 2: Sketching and Text (Lecture A)


Lecture outline l.jpg
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


Technical sketching 2 1 l.jpg
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


Technical sketching con t l.jpg
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


Technical sketching con t5 l.jpg
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?


Technical sketching con t6 l.jpg
Technical Sketching (con’t)

Rough sketch

Multi-view sketch

Shaded sketch

Pictorial sketch


Sketching technique 2 2 l.jpg
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).


Sketching technique 2 28 l.jpg
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.






Proportions construction lines 2 3 l.jpg
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


Proportions construction lines con t l.jpg
Proportions & Construction Lines (con’t)

  • Example of relative proportions:

Standard proportions for the United States flag


Proportions construction lines con t15 l.jpg
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)


Introduction to projections 2 4 l.jpg
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…



Multiview sketching technique con t l.jpg
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


Multiview sketches 2 6 l.jpg
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…


Multiview sketches con t l.jpg
Multiview Sketches (con’t)

Three image planes


Multiview sketches con t21 l.jpg
Multiview Sketches (con’t)

  • Visualization Techniques:

Object – Image plane – The eye of the reviewer relationship

Horizontal, vertical, and depth


Multiview sketches con t22 l.jpg
Multiview Sketches (con’t)

Three types of faces:

1. Normal

2. Inclined


Multiview sketches con t23 l.jpg
Multiview Sketches (con’t)

2. Inclined

Inclined vs. Oblique faces:

Can you tell the difference?

3. Oblique



Lettering con t l.jpg
Lettering (con’t)

Lettering dimensions:

Examples of lettering:



ad