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1 Isometric ellipses In an isometric drawing, the object is viewed at an angle, which makes circles appear as ellipses. Holes Cylinders

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2 Sketching a Circle Draw a square whose sides are the diameter of the circle. At the center of each side define the point of tangency for the circle. Draw the diagonals of the square. Orient the paper so you can draw equal arcs to construct the circle

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3 Introduction to Isometric Projection Isometric means equal measure All planes are equally or proportionately shortened and tilted All the major axes (X, Y, Z) are 120 degrees apart CUBE

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4 Making an Isometric Sketch Defining Axis 30 o 60 o Isometric Axis

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5 Ellipses Can be in Any of Three Planes

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6 Sketching an Isometric of a Hollow Pipe

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7 Step 1 – Creating the Base Box Diameter Length

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8 Step 2 – Ellipse on Front Face Lines to Tangent Points - Lines to tangent points - Corner to corner to get center Tangent Points

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9 Step 3 – Ellipse on Front Face Tangent Points Sketch in Arcs

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10 Step 3 – Ellipse on Back Face and Profile Draw Tangent Lines for Profile Complete Visible Part of Back Ellipse Repeat for ellipse on rear face

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11 Step 4 – Ellipse for Hole on Front Face Create Box for Hole Sketch Ellipse

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12 Isometric of Hollow Pipe

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13 Summary Technical drawings are an effective communication media Projections of various types can be used Isometric projections and creating isometric sketches has been introduced Assignments will emphasize simple isometric sketches

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14 Review Questions 1._______ sketches present the object in a single view, with all three dimensions represented 2._______ sketches present the object in a series of projections, each one showing only two of the objects’ three dimensions 3.Which among the following is NOT an isometric axes (Hint: Use the Isometric Grid paper for reference)? a) b) d) c) 120° 60° 240° 60° 90°

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15 Follow Sketching and Text conventions. Title Information is required. Avoid labels on the sketch. Leave the construction lines – MUCH lighter and thinner than the finished lines Include centerlines on isometrics Tips for Drawing Assignments

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16 Do not try to shade drawing – this is not a pencil sketching class. Use grid paper. Try to sketch along grid lines. Practice sketching straight lines and curves on a grid sheet. Tips for Drawing Assignments

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17 Tips for Pictorial Views In pictorial views, hidden lines are not shown unless absolutely required for clarity, such as; Non-visible bottom of a blind hole Important feature of object not in direct view In pictorial views, holes or notches without bottom/end visible should be assumed to go completely through the object. Centerlines are to be shown on all isometric pictorials.

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18 In Class Assignment Use Isometric Sketch Paper (ISP)

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