Presentation on theme: "2.00 Explain and demonstrate basic sketching skills and techniques."— Presentation transcript:
12.00 Explain and demonstrate basic sketching skills and techniques.
22.01 Explain the concepts related to sketching. Sketching Concepts2.01Explain the concepts related to sketching.
3Quickly & easily get an idea on paper Purpose of a SketchQuickly & easily get an idea on paperDesign sketchesFreehand technical sketchesTechnical illustrationsMost technical drawings start with a sketch
7Paper Pencil Optional Sketching Materials Soft lead Eraser Grid Paper Graph paperIsometric grid paper
8Proportion Clarity Sketching Aids Sketching Technique Sketches must be proportionalUse aids when sketchingPencil-sight sketchingPencil as a measuring deviceKeep your eye on the point to which you’re drawing
9Vertical lines Long straight lines Sketching Lines Top to bottom Series of short straight linesUse edge of plain paper as an aid to the eye for keeping lines straightMove your entire armDon’t draw from your wrist
10Sketching Circles & Arcs Begin by lightly constructing a squareAdd center marks to squareDraw
11Begin with 90° angle Sketching Angles Subdivide once Subdivide twice 45°60°30°Subdivide onceSubdivide twice
23Three equally spaced axes of 120° Isometric SketchingThe 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 appearThree equally spaced axes of 120°
24Isometric SketchingReceding linesTypically 30° off horizontal
25Isometric SketchingCircular shapes appear as ellipses
27Non-Isometric lines Isometric Sketching Locate endpoints and connect You can measure along “isometric lines”You cannot measure along “non-isometric lines”A standard angle measuring device such as a protractor cannot be used to measure angles in isometricAngles are drawn by locating their end points
30Front view is drawn true shape and size Oblique SketchingFront view is drawn true shape and sizeFront view is normal to the viewer’s 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
31Oblique SketchingReceding edges are usually drawn at an angle of 30°, 45°, or 60°
32Oblique SketchingCircles and curves drawn on frontal plane will appear true shape and size