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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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Presentation Transcript
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INTRODUCING

ELLIPSE CONSTRUCTION

slide3

ELLIPSE CONSTRUCTION

WHAT IS IT ?

SEE SOME EXAMPLES

HOW DO YOU DO IT ?

EXERCISES

slide4

ELLIPSE CONSTRUCTION

WHAT IS IT ?

ellipse construction is . . .

A METHOD OF DRAWING ‘OVALS’ ACCURATELY

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watch face

Hi-Fi Speaker

ELLIPSE CONSTRUCTION

LET’S SEE SOME EXAMPLES

ellipses

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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

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ELLIPSE CONSTRUCTION

ALTERNATIVELY. . .

THE TRAMMEL METHOD

There are some specific advantages with this method – can you think what ?

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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