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Finding the Center of a Circle

Wood strip with centerline An easy way to find the center of a large circle is with a framing square and a simple jig made from a scrap piece.

To make the jig, cut a strip of wood that's a little shorter than the circle's diameter. Then, drill holes 1″ from each end and centered on the jig's width. Measure and mark the centerline of the jig's length, as well.

Then, slip a nail in each hole in the jig, and place it against the circle. Lay a framing square against the jig, lined up with the centerline mark. Draw a line on the circle along the edge of the square.

Finding the center Then, move the jig about a quarter of the way around the circle, and draw a second line with the square. The intersection of the two lines is the center of the circle.

Have a nice weekend,

Wyatt Myers
Online Editor, Workbench

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