Engineering Graphics ch 1,2,3, and 6

• Technical drawings serve three purposes

  1) Visualization

  2) Communication

  3) Documentation

• Stages of design process

  1) Problem Identification

  2) Ideation

  3) Refinement/ Analysis

  4) Implementation/Documentation

Sequential engineering: Manufacturing activities have taken place in sequential order rather than concurrently

Ex: Market makes an idea and then goes to engineering, engineering creates product, then, manufacturing inspects products, good products go to warehouse, and then it is sold. This method is considered inefficient due to loss in time and money.

Concurrent engineering: Systematic approach that integrates the design and manufacture of products with the goal of optimizing all elements involved in the life cycle of the product

Ex: IMS Gear having engineering, manufacturing, and marketing all in one to deliver the final product. This type of engineering is efficient and saves money

Lettering standard

• Most hand drawn notes are 3mm (1/8 inch)

• Dark thin lines are the best lines for AutoCAD

• When spacing letters and words, make sure the distance is equal

• Lettering should ALWAYS be legible, easy to create, and use styles acceptable for traditional drawing and CAD drawing.

  → Without Sans serif: No spurs

• No vertical lines because it messes up spaces

• Letter height should be 3/5 inch

• Surfaces can be one of the following four types:

  1) Planar

  2)Single curved

  3) Double curved

  4) warped

• Contours of an object are main outlines that separate it from surrounded space( Positive and negative space)

• Centerlines

  - Shows axis of symmetry for a feature or part 

  - Indicates a path of motion  

  - Shows the location for the bolt-hole circles and other circular patterns  

• Hidden lines: Dashed lines represent features that would be hidden

  → Thick, dark lines represent features of the object that are directly visible.

• Edges: Two surfaces interact

• Vertices: three or more surfaces intersect

• Point: Used to separate location in space but has no width, heigh, or depth

• Important skills for sketches and drawings

  1) Accuracy: No drawing is useful unless it shows accurate info

  2) Speed: Time is money.

  3) Legibility: Means of communicating with others

  4) Neatness: If a drawing is to be accurate and legible, it must be clean as well

Multiview projection: provides certain definite information

There are 6 principle views (Top, bottom, left, right, front, and back )

There are 3 principle dimensions (Height, width, and depth)

• The top view shows the WIDTH and DEPTH of an object

• The front view shows the HEIGHT and WIDTH of an object

• the right side shows the DEPTH and HEIGHT of an object

The top, front, and right side views are the 3 regular views because they are the most used

• Third-angle projection: the views are produced as if the server is outside looking in

  → The US uses 3rd angle projection

• Isometric Views: Provides an easy visual reference for the part described in the orthographic views

  → Does not always sow hidden lines

View of surfaces

• 3 orientations that a plane surface can have to the plane of projection are normal, inclines, and oblique