4 The Importance of Sketching Sketching quickly communicates design ideas.It’s a necessary skill for any technical person.Often part of the creative process – Generation of Design Concepts.Helps to visualize 3D objects from 2D images.Used extensively in Engineering.
5 Sketches from Leonardo da Vinci’s Design Notebook
6 Thomas Edison's Sketches A sketch showing the basic circuit for energizing a discharge tube.First sketch of the phonograph, 1877
8 The Importance of Sketching Not Just for Design - Engineering Inspections
9 The Importance of Sketching Not Just for Design - Engineering Inspections
10 Sketching is used throughout the design process to communicate information
11 The Role of Sketching Talking sketches Thinking sketches Informal communicationThinking sketchesTo help you think creativelyPrescriptive sketchesDocument design ideas
12 Example in DesignProblem Definition:Sketch shows cross-section of a Hong Kong skyscraper tested in the wind tunnel.Tuned mass damper required to prevent excessive vibrations.
13 Example in DesignPreliminary Idea Generation:After considering other alternatives, a pendulum damper was selected as the best option.The design progressed with this basic shape.
14 Example in Design Constraints: After some detailed engineering calculations, the final requirements were determined and details could be worked out with sketches.The final unit has to meet all of the constraints.
16 The Importance of Sketching Plan good for Layout and Cost.But how will it look?
17 The Importance of Sketching Evaluate Options/Different ConceptsHelps to visualize in 3-D.
18 The Importance of Sketching To help sort out the details.
19 Sketching is based on the interactive process of seeing, imagining and representing
20 Interesting optical illusion, but not a good engineering sketch!
21 Interesting optical illusion, but not good engineering sketches!
22 What do you need…Sketching tools - pencils, paper and a big eraser – note: no ruler necessary.patience and practice – with these you can be good at making quick, clear, well-proportioned sketches regardless of your experience or natural ability
25 Fundamental Techniques Straight LinesCurved LinesConstruction Lines and ProportionsLettering
26 Straight LinesBegin using grid paper, or the clear side of graph paper.Mark the endpoints of the line to be drawnLines should be straight, continuous and dark with uniform thickness
27 Straight LinesLong lines are difficult. Use grid paper as a guide or reduce the size of the sketch.Do not fix paper to the table, and rotate it to find an easier angle for drawing lines.Draw away from yourself or at a slight angle.Relax your hand.
28 Straight Lines Good No! No! No! Mechanical MARK END-POINTS Sketched
30 Line Precedence Visible lines have top priority Hidden lines do not cross or have priority over visible linesCentre lines do not cross or have priority over visible or hidden lines
31 Construction LinesThe first step is drawing construction lines that form the backbone the sketch.These very light thin lines roughly layout some of the detailsDo not erase them!
32 Curved LinesCurved lines are essentially interpolations between 2 or more points. These points are typically marked as intersecting lines or tangentsControl the degree of curvature - not too flat, not too curvedCircles and ellipses require construction lines.
36 Use diagonals to proportion Locating the center of squares and rectanglesUse construction lines to draw diagonals. Diagonals can be used to construct new rectangles
37 Creating a Proportioned Sketch Use multiple steps to create lightly sketched rectangles and squares then used them as guides for final sketch
38 Lettering Suggested sequence of strokes This can be a guide for hand lettering of technical drawings
39 Sketching in Engineering ReviewDemonstrate the Importance of Sketching.Introduce Sketching TechniquesDrawing simple lines and curves, using construction lines, bounding lines, etc.Next ClassTypes of Engineering DrawingsProjectionsViews