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Cutting a Circle with a Tablesaw

Making the Circle Cut

Find the center point of the square workpiece that is at least 1/4 inch larger than the diameter of the circle you need.

Find the center point by drawing diagonals from the corners and marking their intersection.
At this point, either use a circle cutting fixture that has predefined distances, or do something similar as in the video to the right. Obviously, if you have the time, building a jig will be provide more accurate and consistent circles if multiples need to be built.

Proceed to cut the corners off, until a circle is achieved.

Dadoing the Circle

In addition, a further step that can be accomplished while using the same setup is to dado the perimeter of the circle. (Another reason to build an adjustable circle cutting jig.)

By lowering the blade below the height of the workpiece, and moving the center of the circle closer to the blade, you can create a dado on the edge of your newly created circle.