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Engineering H191 Engineering Fundamentals and Laboratory I. Week 01 Day 01 Graphics: The Language of Design. Objectives. Understanding graphics as a communication tool Technical sketching Projections Orthographic Pictorial Sketching hints Lettering. How Would You Describe This?.

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Engineering H191 Engineering Fundamentals and Laboratory I


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engineering h191 engineering fundamentals and laboratory i

Engineering H191Engineering Fundamentals and Laboratory I

Week 01 Day 01

Graphics: The Language of Design

objectives
Objectives
  • Understanding graphics as a communication tool
  • Technical sketching
  • Projections
    • Orthographic
    • Pictorial
  • Sketching hints
  • Lettering

AU 2005

how would you describe this
How Would You Describe This?
  • In teams of two, describe using only words
  • How effective is this approach?

AU 2005

three basic types of technical drawings
Three Basic Types of Technical Drawings
  • Freehand sketches
  • Instrument drawings
  • Computer drawings and models

AU 2005

introduction to projections
Introduction to Projections
  • Present 3-D objects with 2-D media
  • Two Basic Categories

OrthographicPictorial

AU 2005

projections four basic types

Orthographic Projections

Projections: Four Basic Types

Axonometric

Pictorials

Oblique

Perspective

AU 2005

orthographic projections
Orthographic Projections
  • Collection of 2D drawings
  • Accurately represent object
  • Technical Graphics - Chapter 3

AU 2005

which views to present
Which Views to Present?
  • General Guidelines
    • Pick a Front View that is most descriptive of object
    • Normally the longest dimension is chosen as the width (or depth)
    • Most common combination of views is to use: Front, Top, and Side View
    • Views other than the Principal Views are called Auxiliary Views (see 3.15 in the Technical Graphics text)

AU 2005

conventional orthographic views

Width

Top View

Depth

Right Side View

Front View

Height

Conventional Orthographic Views

AU 2005

hidden and center lines in orthographic projections

Hidden Lines – represent features that cannot be seen in the current view

  • Centerlines – represent symmetry and mark the center of circles, the axes of cylinders, and the axes of symmetrical parts, such as bolts
Hidden and Center Lines in Orthographic Projections

AU 2005

for example
For Example:

1. Visible

2. Hidden

3. Center

AU 2005

creating the orthographic projection sketch
Creating the Orthographic Projection Sketch
  • Front View
  • Right Side View
  • Top View

AU 2005

step 2 lightly block major features
Step 2 – Lightly Block Major Features
  • Holes
  • Arcs
  • Cutouts

Use very light lines for drawing in the construction lines

AU 2005

step 3 refine and locate features in all views
Step 3 – Refine and Locate Features in All Views

Use very light lines for drawing in the construction lines

AU 2005

step 4 add final lines
Step 4 – Add Final Lines

Use very light lines for drawing in the construction lines

AU 2005

add another view
Add Another View
  • Sketch the left side view of the object
  • Compare your view with the others at your table

AU 2005

slide22

Add Another View

  • Does yours look something like this?

AU 2005

lettering notes
Lettering Notes
  • Lettering Guidelines – Technical Graphics: Chapter 1
  • Lettering Styles
    • Shape of Letters
    • Order of drawing lines
  • Character Uniformity
  • Spacing

AU 2005

lettering
Lettering

AU 2005

sketching tips general
Sketching Tips: General
  • Relax and draw in a direction comfortable to you
  • Mark end points of the lines to be sketched and draw between them
  • Draw long lines as a series of short ones
  • Use grid paper when available
  • Follow sketching and text conventions
  • Do NOT use a straight edge to draw lines!

AU 2005

sketching tips construction lines
Sketching Tips: Construction Lines
  • Use construction lines
  • Begin by drawing bounding boxes with construction lines
  • Make construction lines much lighter and thinner than finished lines
  • Identify the major features and overall dimensions
  • Leave construction lines on the sketch

AU 2005

sketching tips miscellaneous
Sketching Tips: Miscellaneous
  • Do not shade the drawing – this is not pencil sketching
  • Title information is required
  • Keep views aligned (very important)
  • Include centerlines on isometrics
  • Avoid labels on the sketch
  • Draw neat circles – change page orientation if needed

AU 2005

today s assignment
Today's Assignment
  • Drawing 1:
    • Blocks of each kind will be handed out at each table to sketch from.
  • Drawing 2:
    • Lettering assignment handed out in class.
    • An additional copy will be in your course packet from CopEZ

AU 2005