how to draw an ellipse
DESCRIPTION
How to draw an ellipse.TRANSCRIPT
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How to draw an Ellipse
By: Tim Closs
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What is an ellipse?
Basically it is a stretched circle
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What is an Axis?The horizontal line and vertical that pass through the center.
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What is the Minor Axis?The shortest axis. Which in this case is the vertical line.
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What is the Major Axis?The longest of the two axis. Which is the horizontal line.
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Tools you will need
45/90 Triangle or 30/60 Triangle
A piece of computer paper
T-Square or parallel with drafting board
Masking Tape
Pencil with eraser
Compass
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Step 1
Line up paper with T-square parallel
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Step 2
Tape down Top corners
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Step 3
Tape down Bottom corners
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Step 4
Find the Center of your paper using the cross technique (see last weeks notes)
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Step 5
Layout vertical axis using :
45/90 Triangle
T-square
Pencil
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Step 6
Layout horizontal axis using :
T-square
Pencil
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Step 7
Mark Minor Axis
Set compass to aproximatley 2 inches
Mark vertical axis
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Step 8
Mark Major Axis
Set compass to aproximatley 3 1/2 inches
Mark horizontal axis
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Step 9
Mark center O
Mark major axis A B
Mark minor axis C D
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Step 10
Set compass from O to C
Make a mark on the right side of major axis
Label E
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Step 11
Using your triangle draw a Line from C to B
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Step 12
Set compass to E B
Set compass on C and swing an arc intersecting line C B
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Step 13
Label intersection F
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Step 14
Bisect line F B (see earlier lessons on bisecting a line)
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Step 15
Extend Bisector to make point H
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Step 16
Mark point G where bisector intersected line AOB
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Step 17
Set compass O to H
From O make a mark above C and label it K
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Step 18
Set compass O to G
From O make a mark to the right A and label it J
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Step 19
Using your triangle draw a Line from H through J
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Step 20
Using your triangle draw a Line from K through J
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Step 21
Using your triangle draw a Line from K through G
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Tangency
Line K J
Line H J
Line K G
Line H G
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Step 22
Set compass to G B
Having the center on G swing an arc to both Tangency lines
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Step 23
Set compass to J A
Having the center on J swing an arc to both Tangency lines
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Step 24
Set compass to H C
Having the center on H swing an arc to both Tangency lines
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Step 25
Set compass to K D
Having the center on K swing an arc to both Tangency lines
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Reference
Walker, John and Bernard D. Mathis.
Exploring Drafting. Illinois: The Goodheart-Willcox Company, 2012. Print
Photos: Taken by T. Closs