INTRODUCING
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
ELLIPSE CONSTRUCTION
LET’S SEE SOME EXAMPLES
ellipses
watch
face
Hi-Fi
Speaker
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
You could certainly use a stencil although you would need
to have a huge number of them to cover all eventualities.
ELLIPSE CONSTRUCTION
ALTERNATIVELY. . .
THE TRAMMEL METHOD
There are some specific advantages with
this method – can you think what ?
ELLIPSE CONSTRUCTION
EXERCISE 1
CONSTRUCT THE FOLLOWING ELLIPSES
ELLIPSE A
Major = 80 Minor = 40
ELLIPSE B
B
A
Major = 70 Minor = 40
ELLIPSE C
Major = 120 Minor = 60
ELLIPSE D
C
D
Major = 140 Minor = 60
FINISHED