INTRODUCING

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# INTRODUCING - PowerPoint PPT Presentation

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

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

LET’S SEE SOME EXAMPLES

ellipses

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

ELLIPSE CONSTRUCTION

ALTERNATIVELY. . .

THE TRAMMEL METHOD

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

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