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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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ENGR 114 Chapter 3: Sketching

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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.

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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.

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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

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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.

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Understanding Sketching Techniques

  • Essential shapes can be blocked in using construction lines

  • Proportions are also maintained

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Sketching Lines

  • Straight Lines

    • Angle Paper

    • Swing from elbow and not wrist

    • Draw in one fluid stroke

    • Experiment with direction

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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.

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Basic Structure of Objects

  • Cube or Rectangular Solid

  • Cylinder

  • Cone / Pyramid

  • Sphere

  • Combination of the above

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Sketching Cubes or Rectangular Solids

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Sketching Cylinders, Cones and Pyramids

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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