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Freehand Sketching Introduction to Mechanical Engineering Fall 2004 Created by: P.M. Larochelle & J.S. Ketchel Freehand Sketching Ideation – Integral to the design process Generation of design concepts to solve a design problem

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freehand sketching

Freehand Sketching

Introduction to Mechanical Engineering

Fall 2004

Created by:

P.M. Larochelle & J.S. Ketchel

freehand sketching2
Freehand Sketching
  • Ideation – Integral to the design process
    • Generation of design concepts to solve a design problem
  • Usually freehand sketching is used to explore, study and communicate these design concepts
  • Even today, and for the foreseeable future, many great design ideas are communicated via freehand sketching
  • The “BEST” design engineers can immediately communicate an idea via a freehand sketch
freehand sketching3
Freehand Sketching
  • Required
    • Pencil, Paper and Eraser
  • Do not use
    • Straight edges, templates, compasses etc.

They slow down the process and defeat the purpose of fast communication of ideas!

freehand sketching4
Freehand Sketching
  • Sketches are planned
  • Visualize the sketch
    • Size of paper & scale
    • Orientation of the object
    • Minimum detail to communicate the idea
    • Type of sketch
      • Oblique
      • Isometric
      • Orthographic
types of sketches6
Types of Sketches
  • Oblique
    • Advantage: one true face
    • Disadvantage: not “photorealistic”
  • Isometric (a type of axonometric drawing) & Perspective
    • Advantage: easy to visualize the object
    • Disadvantage: no true face
  • Multi-View (orthographic)
    • Advantage: true faces
    • Disadvantage: hard to visualize
  • Isometric, oblique, and perspective

sketches are methods of showing

the object in a single view.

freehand sketching7
Freehand Sketching
  • Freehand sketches are not sloppy!
freehand sketching8
Freehand Sketching
  • When possible use the grid on your engineering paper!
freehand sketching9
Freehand Sketching
  • Outline the sketch
    • Use light lines
    • Show major edges and boundaries and then add small details
freehand sketching10
Freehand Sketching
  • Shape the sketches
    • Add appropriate details
    • Darken object lines
freehand sketching11
Freehand Sketching
  • Fundamental Rule of Sketching
    • Maintain Proportion
  • Hints: use standard techniques to draw lines and arcs
  • Lines
    • Locate a start “dot”
    • Locate an end “dot”
    • Put pencil on start dot, look at the end dot and smoothly move pencil toward the end dot
freehand sketching12
Freehand Sketching
  • Circles (arcs)
    • Draw light horizontal and vertical lines that intersect at the center
    • Lightly mark the radius on the lines
    • Connect the radius marks with arcs to complete the circle
    • See Step-by-Step 3.1& 3.3 on pages 60 & 62.
construction lines
Construction Lines
  • Light and thin lines
  • Serve as path for final straight lines
  • Intersection of construction lines specify the length of the final lines
  • Points marked by the intersection of construction lines serve as guides for sketching of arcs and circles
  • Guide the proportion of the sketch
oblique sketching
Oblique Sketching
  • Step 1 – Draw the horizontal and vertical construction lines which outline the basic shape of the main face - “Blocking in”
  • Step 2 – Sketch the face of the part
  • Step 3 – Sketch receding construction lines at 30 or 45 degrees
  • Step 4 – Sketch- in and darken the lines outlining the part – Done!
isometric sketching
Isometric Sketching
  • Step 1 – Construct a horizontal line, two lines at 30 degrees above the horizontal and a vertical line through their intersection
    • This defines the isometric axes used to draw the sketch
isometric sketching18
Isometric Sketching
  • Step 2 – Sketch in a box to “block-in” the front face and the other faces follow
  • Step 3 – Sketch the outline of the front face in it’s “block” and the other faces follow
    • Work parallel to the isometric axes
references
References
  • Chapter 3 of Modern Graphics Communication by Giesecke, Mitchell, Spencer, Hill, Dygdon, Novak, and Lockhard, 3rd edition. Prentice-Hall, 2004.
  • Technical Drawing by Giesecke, Mitchell, Spencer, Hill, Dygdon, and Novak, 9th edition. Macmillan, 1991.