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**2.00 Explain and demonstrate basic sketching skills and techniques.**

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**2.01 Explain the concepts related to sketching.**

Sketching Concepts 2.01 Explain the concepts related to sketching.

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**Quickly & easily get an idea on paper**

Purpose of a Sketch Quickly & easily get an idea on paper Design sketches Freehand technical sketches Technical illustrations Most technical drawings start with a sketch

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**Freehand Technical Sketch**

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Design Sketch Leonardo Divinci sketch

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**Technical Illustration**

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**Paper Pencil Optional Sketching Materials Soft lead Eraser Grid Paper**

Graph paper Isometric grid paper

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**Proportion Clarity Sketching Aids Sketching Technique**

Sketches must be proportional Use aids when sketching Pencil-sight sketching Pencil as a measuring device Keep your eye on the point to which you’re drawing

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**Vertical lines Long straight lines Sketching Lines Top to bottom**

Series of short straight lines Use edge of plain paper as an aid to the eye for keeping lines straight Move your entire arm Don’t draw from your wrist

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**Sketching Circles & Arcs**

Begin by lightly constructing a square Add center marks to square Draw

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**Begin with 90° angle Sketching Angles Subdivide once Subdivide twice**

45° 60° 30° Subdivide once Subdivide twice

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Sketching Assignment

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Sketching 2.02 Explain the concepts and principles underlying isometric, oblique and multiview sketching.

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Sketching Types of Sketches Single-view Multi-view Pictorials

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**Single-view Sketching**

Technical purposes Front view Most descriptive features

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**Steps for Single-view Sketching**

Object Step 2 Step 1 Step 3 Step 4

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Multi-view Sketching Technical sketch Front view Top view Side view

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Multi-view Sketch TOP VIEW FRONT VIEW R. SIDE VIEW

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**Single-view/Multiview Sketch Assignment**

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**Quickly communicate an idea Three dimensions in one view**

Pictorial Sketches Quickly communicate an idea Three dimensions in one view Width Height Depth

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Pictorial Sketches Three (3) types Isometric Oblique Perspective

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Isometric Sketch HEIGHT WIDTH DEPTH

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**Three equally spaced axes of 120°**

Isometric Sketching The prefix “iso” means equal. Other positions are possible depending on what surfaces of the object are being emphasized Ellipses must be oriented according to the plane in which they appear Three equally spaced axes of 120°

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Isometric Sketching Receding lines Typically 30° off horizontal

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Isometric Sketching Circular shapes appear as ellipses

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Isometric Ellipses Correct ellipse orientation

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**Non-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 isometric Angles are drawn by locating their end points

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**Isometric Sketching Assignment**

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Oblique Sketch HEIGHT DEPTH WIDTH

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**Front view is drawn true shape and size**

Oblique Sketching Front view is drawn true shape and size Front view is normal to the viewer’s line of sight Circles and curves appearing on the side and top planes will be distorted Receding edges can be sketched at any angle except vertical or horizontal Long side of an object, circles, and arcs should be shown in the frontal plane to lessen distortion

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Oblique Sketching Receding edges are usually drawn at an angle of 30°, 45°, or 60°

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Oblique Sketching Circles and curves drawn on frontal plane will appear true shape and size

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**Oblique Sketching Assignment**

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Perspective Sketches 1-Point Perspective 2-Point Perspective

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Perspective Sketches Objects appear as the eye would see them Most realistic type of pictorial sketch Most difficult pictorial sketch to draw

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**Perspective Sketching Assignment**

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