carcentric
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| posted on 18/3/06 at 03:45 AM |
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Brooklands screens - getting the top curve right
I want to "cheat" and make a pair using The Book method of frame construction - "real" repros cost over $200/pair!
So how do I draw the traditional curve across the top of the glass? It looks different from the elipse you get with a loop of string and two center
points.
[Edited on 18/3/06 by carcentric]
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mangogrooveworkshop
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| posted on 18/3/06 at 08:27 AM |
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using a set of french curves will get you the right top
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Syd Bridge
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| posted on 18/3/06 at 10:27 AM |
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Sometimes you can get the curves by using tangential circles. Two or more can be common to get what you want.
Syd.
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iank
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| posted on 18/3/06 at 10:38 AM |
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Some methods of drawing ellipses about half way down this page. Might give a hint at drawing your curve. Easiest thing might be to find something
with the curve you want in a book or draw it up in a cad/drawing package and use it as a template.
http://www.du.edu/~jcalvert/math/ellipse.htm
Cutting along the line and grinding it smooth will be the real trick.
[Edited on 18/3/06 by iank]
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