To make the circle jig cut a piece of 1 2 plywood to 6 x 48 and drill the appropriate holes in it to attach your router to one end so the router is centered on the jigs width. To generate the shape of these curves Jeff uses a shop made ellipse drawing jig. Photos by Rob Brown In reality there are two jigs used to cut an ellipse the ellipse jig and a very simple circle jig.

Our December 2011 issue of Popular Woodworking Magazine features a gorgeous table project by designer craftsman Jeff Miller.

Woodworking I love routers and this elliptical router jig makes me love them even more. How in the world did somebody come up with such a neat idea You ll need a piece of 3 4 plywood that measures 18 square to get started. This is a precision way to make repeatable ellipses of the same size. In the end I enjoyed making this jig it didn t take long and it s amazing how something like this can change your outlook on woodworking just by the fact that you can now make an oval table top the without this jig would be a much larger chore. This jig is one of those anonymous acts of genius. Set up a router table with a 1 2 straight bit and mill two centered grooves in the plywood. A shop-made jig is pretty easy to make with a few scraps and a handful of jig hardware. Most people will look at an ellipse and simply call it an oval but there is more to it than that.

That way the moving blocks can t escape the jig. The grooves interest at a 90 angle so they look like a big plus sign. Ovals are tough because it s a mathematical equation to get the shape correct. The best way to make the slots is with a dovetail bit or similar. Simply adjust the trammel bars to measure half the width and half the length of the proposed ellipse. His Arch Table includes graceful sweeping curves in the base. What makes an ellipse special is two points inside the shape called the foci plural of focus . This for use in an upcoming project where I needed to cut an elliptical top fo You spin an arm around and around and instead of tracing a circle it outlines a perfect ellipse.

With a few simple formulas and a clever jig you can draw and cut ellipses of any size and add this stately and pleasing shape to your work. I ve made countless circles with router jigs over the years but this simple jig for creating a multitude of oval shapes is slick. In this video I show how I build a shop made oval cutting jig for your router. You can make this jig as small or as large as you need it. Varying the distances of the nails on the stick ply will make the ellipse taller and or fatter. While I love routers I m not so fond of math. The circle jig provides easy adjustment for sizing the ellipse by sliding the trammel bars along parallel rods that attach to the router base. Old mechanisms like this were used by woodworkers to draw an ellipse with a pencil or stylus which they would then cut out by hand.

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