engr 114 chapter 3 sketching
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ENGR 114 Chapter 3: Sketching

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ENGR 114 Chapter 3: Sketching Sketching (Freehand) Sketching is a method of visualizing and conceptualizing your ideas that will allow you to communicate your ideas to others.

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sketching freehand
Sketching (Freehand)
  • Sketching is a method of visualizing and conceptualizing your ideas that will allow you to communicate your ideas to others.
  • Sketching is not intended to produced final engineering drawings, but it is an important step in the engineering design process.
sketching pencils
Sketching Pencils
  • Pencils come with leads of varying degrees of hardness.
  • Hard grades H – 4H
  • Soft grades B – 4B
  • HB = #2 Pencil
  • The larger the number the harder of softer the lead.
understanding sketching techniques
Understanding Sketching Techniques
  • Analyzing complex objects
    • The ability to break down complex shapes into simpler geometric primitives is an essential skill for sketching and modeling objects
    • Basic curves and straight lines are the basis of many objects
understanding sketching techniques6
Understanding Sketching Techniques
  • Maintaining Proportions – It is very important to keep the sketch in proportion
    • It is beneficial to block out general proportions using construction lines.
understanding sketching techniques7
Understanding Sketching Techniques
  • Essential shapes can be blocked in using construction lines
  • Proportions are also maintained
sketching lines
Sketching Lines
  • Straight Lines
    • Angle Paper
    • Swing from elbow and not wrist
    • Draw in one fluid stroke
    • Experiment with direction
sketching objects 3d
Sketching Objects (3D)
  • Viewpoint
    • You should always maintain the same viewpoint when sketching an object.
  • Isometric Sketching
    • When sketching 3D objects it is easiest to choose a viewpoint that will produce an isometric sketch.
basic structure of objects
Basic Structure of Objects
  • Cube or Rectangular Solid
  • Cylinder
  • Cone / Pyramid
  • Sphere
  • Combination of the above
geometric constructions
Geometric Constructions
  • We are going to cover five basic geometric constructions that will be useful in drawing.
    • Bisect an angle
    • Bisecting a line using a compass.
    • Draw a perpendicular to a line at a point.
    • Finding the center of a circle
    • Dividing a line into n equal segments
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