Career & Technical Education Sketching 2.00 Explain and demonstrate basic sketching skills and...
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Sketching2.00Explain and demonstrate basic sketching skills and techniques.
Sketching Concepts2.01Explain the concepts related to sketching.
Purpose of a SketchQuickly & easily get an idea on paperDesign sketchesFreehand technical sketchesTechnical illustrations
Freehand Technical Sketch
Sketching MaterialsPaperPencilSoft leadOptionalEraserGrid Paper
Sketching LinesVertical linesTop to bottom
Long straight linesSeries of short straight lines
Sketching Circles & ArcsBegin by lightly constructing a square
Sketching AnglesBegin with 90 angle603045Subdivide onceSubdivide twice
Sketching AssignmentPage 37 Figure 2-18Page 41 Figure 2-28Page 42 Figure 2-29Page 39 Figure 2-23
Sketching2.02Explain the concepts and principles underlying isometric, oblique and multiview sketching.
SketchingTypes of SketchesSingle-viewMulti-viewPictorials
Single-view SketchingTechnical purposes
Front viewMost descriptive features
Steps for Single-view SketchingStep 2Step 1Step 3Step 4
Multi-view SketchingTechnical sketchFront viewTop viewSide view
Single-view/Multiview Sketch AssignmentFigure 2-5 Front viewFigure 2-5 front, top, ride side
Pictorial SketchesQuickly communicate an ideaThree dimensions in one viewWidthHeightDepth
Pictorial SketchesThree (3) typesIsometricObliquePerspective
Isometric SketchingThree equally spaced axes of 120
Isometric SketchingReceding linesTypically 30 off horizontal
Isometric SketchingCircular shapes appear as ellipses
Isometric EllipsesCorrect ellipse orientation
Isometric SketchingNon-Isometric linesLocate endpoints and connect
Isometric Sketching AssignmentPg. 35 Figure 2-15Pg. 36 Figure 2-16Pg. 44 Figure 2-36Pg. 46 Figure 2-41Pg. 47 Figure 2-44
Oblique SketchingFront view is drawn true shape and size
Oblique SketchingReceding edges are usually drawn at an angle of 30, 45, or 60
Oblique SketchingCircles and curves drawn on frontal plane will appear true shape and size
Oblique Sketching AssignmentRead definition page 34P. 43 fig. 2-32 B. & cabinet half and Cavalier full depthP. 44 2-34
Perspective Sketches2-Point Perspective1-Point Perspective
Perspective SketchesObjects appear as the eye would see themMost realistic type of pictorial sketchMost difficult pictorial sketch to draw
Perspective Sketching AssignmentRead perspective definition p. 413P. 410 fig 12-3 1 point perspective
Sketching & Book AssignmentP. 50 fig. 2-51 Use graph paper & print a,b,ect.P. 56 Review content & academic vocabulary (define all)Review key concepts 2-9P. 57 #11 1 paragraphp. 58 1,2,3,9 p. 60 B,F,K multiview
*Most technical drawings start with a sketch*Leonardo Divinci sketch*Graph paperIsometric grid paper*Sketches must be proportionalUse aids when sketchingPencil-sight sketchingPencil as a measuring deviceKeep your eye on the point to which youre drawing*Use edge of plain paper as an aid to the eye for keeping lines straightMove your entire armDont draw from your wrist*Add center marks to squareDraw **The prefix iso means equal.Other positions are possible depending on what surfaces of the object are being emphasizedEllipses must be oriented according to the plane in which they appear*You can measure along isometric linesYou cannot measure along non-isometric linesA standard angle measuring device such as a protractor cannot be used to measure angles in isometricAngles are drawn by locating their end points*Front view is normal to the viewers line of sightCircles and curves appearing on the side and top planes will be distortedReceding edges can be sketched at any angle except vertical or horizontalLong side of an object, circles, and arcs should be shown in the frontal plane to lessen distortion