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INTRODUCING

INTRODUCING. ELLIPSE CONSTRUCTION. ELLIPSE CONSTRUCTION. WHAT IS IT ?. SEE SOME EXAMPLES. HOW DO YOU DO IT ?. EXERCISES. ELLIPSE CONSTRUCTION. WHAT IS IT ?. ellipse construction is . . . A METHOD OF DRAWING ‘OVALS’ ACCURATELY. watch face. Hi-Fi Speaker. ELLIPSE CONSTRUCTION.

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INTRODUCING

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  1. INTRODUCING ELLIPSE CONSTRUCTION

  2. ELLIPSE CONSTRUCTION WHAT IS IT ? SEE SOME EXAMPLES HOW DO YOU DO IT ? EXERCISES

  3. ELLIPSE CONSTRUCTION WHAT IS IT ? ellipse construction is . . . A METHOD OF DRAWING ‘OVALS’ ACCURATELY

  4. watch face Hi-Fi Speaker ELLIPSE CONSTRUCTION LET’S SEE SOME EXAMPLES ellipses

  5. You could certainly use a stencil although you would need to have a huge number of them to cover all eventualities. ELLIPSE CONSTRUCTION HOW DO YOU DO IT ? AUXILIARY CIRCLE METHOD Step 1 - Draw a circle using the major diameter Step 2 - Draw another using the minor diameter Step 3 – Split the circles into 12 equal sections Step 4 – Identify clearly which way round it sits Step 5 – Mark the four points at 3, 6, 9 & 12 o’clock Step 6 – Put in the horizontals and verticals Step 7 – Identify the rest of the points Step 8 – Plot the ellipse by joining up the 12 points

  6. ELLIPSE CONSTRUCTION ALTERNATIVELY. . . THE TRAMMEL METHOD There are some specific advantages with this method – can you think what ?

  7. B A D C ELLIPSE CONSTRUCTION EXERCISE 1 CONSTRUCT THE FOLLOWING ELLIPSES ELLIPSE A Major = 80 Minor = 40 ELLIPSE B Major = 70 Minor = 40 ELLIPSE C Major = 120 Minor = 60 ELLIPSE D Major = 140 Minor = 60

  8. ELLIPSE CONSTRUCTION FINISHED

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