Text of Chapter 5 Sketching Applications. Why Sketching? Sketching (i.e., freehand drawing)...
Chapter 5Sketching Applications
Why Sketching?Sketching (i.e., freehand drawing) Drawing without drafting equipmentOnly paper, pencil, and an eraser neededFast, visual communicationAsset for communicating technical conceptsAll lines are related in sketchesSize and directionSketches should be proportionalActual size depends on paper and sketch size
Sketching Tools & Materials
Soft lead pencilInitially type of paper is not critical as long as the idea can be conveyedGrid paper is best to define scale
Sketching Tools and MaterialsPencils Should have soft leadCommon No. 2Mechanical pencil with H, F, or HB leadAutomatic 0.7-mm or 0.9-mm pencil with F or HB leadPoint should be slightly roundedPaperAlmost any type works
Sketching Straight Lines
Sketching Circular ObjectsTrammel MethodMake a trammel or use scalePlace pencil on one point while holding the end and rotate around center pointNail and string methodHand compass MethodUse your hand as the center and rotate the paper
PracticeSketch freehandHow did you do?
Measurement and ProportionProportion of lines to each other are more important then the size of the sketch itselfThe first line sketched determines the ______of the drawingThe second line determines the ______ of the drawingUse your pencil to establish measurements if no scale is available
Sketching ProceduresBefore sketching try to visualize the object or finished productSketch very light lines of the outlineAdd details being careful to keep the proportion correctDarken in the desired lines of the final sketchUse a grid to create irregular shapesUse Construction LinesBox out drawings
Multiview ProjectionEstablishes two or more views of an object as projected on two or more planes Uses orthographic projection techniquesElevationsTwo-dimensional exterior views of a structureProper view selectionSix primary views
Multiview DetailsUse the front, left side, right side, and back as elevationsWhere do all drawings come from?
Floor PlansRoof PlanCross SectionElectricalSite
Mirror LineHeightWidth________________ or _______________Sketches____________ = 90
Practical Application of Orthographic ProjectionAny projection of features onto an imaginary perpendicular planeLines of sight are perpendicular to the planeObjects are true size if they are parallel to the planeObjects are foreshortened if they are not parallel to the planeAlignment of views is critical
One and Two Point ___________Projection SketchesDetermine best view for the frontSet up isometric axesSketch overall blockAdd details