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Need a device or guide for scribing eliptical tops.

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Forum topic by Bill White posted 02-17-2012 10:54 PM 938 views 0 times favorited 5 replies Add to Favorites Watch
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Bill White

4449 posts in 3421 days


02-17-2012 10:54 PM

Topic tags/keywords: shaping

I have seen some string/nail options for an ellipse (did I spell that correctly?). Anybody got some guides?
Bill

-- bill@magraphics.us


5 replies so far

View DIYaholic's profile

DIYaholic

19172 posts in 2136 days


#1 posted 02-17-2012 11:41 PM

Trammel of Archimedes

Haven’t used it. Just remember a LJ’er made a toy of one & posted.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procrastination a bad thing?

View waho6o9's profile

waho6o9

7171 posts in 2038 days


#2 posted 02-18-2012 12:54 AM

Make an x and y axis. For example 10 inches = one axis, 4 inches = the other axis. The center point will be the focal point.
Make a story stick any comfortable size you want. Make three lines on the story stick on the small axis, one on the end, one in the center, and one on the other end.
Make a series of dots in each quadrant by placing 2 lines of the story stick on each axis and make a mark on the ending line.
Move the story stick around and you will see the pattern.

View HamS's profile

HamS

1809 posts in 1850 days


#3 posted 02-18-2012 01:04 AM

http://www.anvilfire.com/21centbs/math/ovals.htm

That was probably the simplest one. Google string ellipse for more options.

-- Haming it up in the 'bash.

View bilbaggins's profile

bilbaggins

99 posts in 1910 days


#4 posted 02-18-2012 01:06 AM

Hi Bill

there are a number of posts here with tramel info, just do a search using:

“ellipse trammel”

that should give you a bunch of options

rgds

bilA

-- bilbaggins says: The best time to plant a tree is twenty years ago. The second best time is now. ~ Chinese proverb

View longgone's profile

longgone

5688 posts in 2769 days


#5 posted 02-18-2012 02:09 AM

http://lumberjocks.com/projects/61062

Andy made one recently as a toy. Works on a larger scale for big elliptical tops.

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