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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 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.

• 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.

• 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

• Maintaining Proportions – It is very important to keep the sketch in proportion

• It is beneficial to block out general proportions using construction lines.

• Essential shapes can be blocked in using construction lines

• Proportions are also maintained

• Straight Lines

• Angle Paper

• Swing from elbow and not wrist

• Draw in one fluid stroke

• Experiment with direction

• 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.

• Cube or Rectangular Solid

• Cylinder

• Cone / Pyramid

• Sphere

• Combination of the above

Sketching Cubes or Rectangular Solids

Sketching Cylinders, Cones and Pyramids

• 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