ENGR 114 Chapter 3: Sketching

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# ENGR 114 - PowerPoint PPT Presentation

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

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
• 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
• 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 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 Techniques
• Essential shapes can be blocked in using construction lines
• Proportions are also maintained
Sketching Lines
• Straight Lines
• Angle Paper
• Swing from elbow and not wrist
• Draw in one fluid stroke
• Experiment with direction
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
• Cube or Rectangular Solid
• Cylinder
• Cone / Pyramid
• Sphere
• Combination of the above
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