4The 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.
5Sketches from Leonardo da Vinci’s Design Notebook
6Thomas Edison's Sketches A sketch showing the basic circuit for energizing a discharge tube.First sketch of the phonograph, 1877
8The Importance of Sketching Not Just for Design - Engineering Inspections
9The Importance of Sketching Not Just for Design - Engineering Inspections
10Sketching is used throughout the design process to communicate information
11The Role of Sketching Talking sketches Thinking sketches Informal communicationThinking sketchesTo help you think creativelyPrescriptive sketchesDocument design ideas
12Example 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.
13Example in DesignPreliminary Idea Generation:After considering other alternatives, a pendulum damper was selected as the best option.The design progressed with this basic shape.
14Example 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.
16The Importance of Sketching Plan good for Layout and Cost.But how will it look?
17The Importance of Sketching Evaluate Options/Different ConceptsHelps to visualize in 3-D.
18The Importance of Sketching To help sort out the details.
19Sketching is based on the interactive process of seeing, imagining and representing
20Interesting optical illusion, but not a good engineering sketch!
21Interesting optical illusion, but not good engineering sketches!
22What 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
25Fundamental Techniques Straight LinesCurved LinesConstruction Lines and ProportionsLettering
26Straight 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
27Straight 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.
28Straight Lines Good No! No! No! Mechanical MARK END-POINTS Sketched
30Line 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
31Construction 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!
32Curved 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.
36Use diagonals to proportion Locating the center of squares and rectanglesUse construction lines to draw diagonals. Diagonals can be used to construct new rectangles
37Creating a Proportioned Sketch Use multiple steps to create lightly sketched rectangles and squares then used them as guides for final sketch
38Lettering Suggested sequence of strokes This can be a guide for hand lettering of technical drawings
39Sketching 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