Making an Oval

[Lee Schierer]

I need to make an oval table top. If I know the overall length and the overall width of the oval that I need, is there a formula for the two nail and string loop method for drawing an oval that will determine how far apart to place the nails and what size loop of string I need. For the sake of argument lets say the board is 30" wide and 48" long and I want the oval to be 30 X 48 when I'm done.

I can't be pounding in a lot of nails to draw this oval.

[Jim Becker]

I don't remember the formula, but I do suggest you do your oval on cardstock first and then just trace it onto your workpiece. It's a cheap way to faddle with things... ;)

[Phil Phelps]

....you want a perfect oval and I didn't even rate a hello :( Well, maybe you didn't know. I have a plotter, Lee. Give me the demensions and I'll send you a paper pattern of a perfect oval. Maybe two of em'. I am good for something :p

[Ron Meadows]

Lee,

A quick internet search yeilded fruit for you.

Go here: http://home.att.net/~waterfront-woods/Articles/Ellipse/stringellipse.htm

There are distructions for drawing an ellipse with nails and string. Looks purdy easy

Ron

[Bill Roland]

Here's a link with calculator.
http://www.anvilfire.com/21centbs/math/ovals.htm

[Peter Stahl]

These guys are quick! Check this site out too Lee.

http://www.ad500.org.uk/article/kitguide/shield.htm

Pete

[Lee Schierer]

I appreciate the rapid response and good links.

Phil, no need to make a pattern, I can lay one out fast enough. I may keep you in mind for future curves if I need some.

[John Piwaron]

Why not make one of those router trammels that guide the router in a perfect ellipse?

[Ken Frantz]

A fella that I worked in a cabinet shop had a mechanical rig built to draw circles to ovals of any size.

I think I could figure out how to build one, but if there is a plan already for one out in cyberspace and easy to copy the plan, it would save some one from going bald from pulling their hair out!!!