How to Do Concentric Radii for Countertops

Concentric radii are simply circles with the same axis point. In countertop construction a designer may wish to create a curved countertop that is the same thickness or radii across the curved area. Creating concentric radii is a simple process once the basic measurements of the area are known. Use the same basic technique for small concentric circles or large ones.

1-inch graph paper
Pencil
Compass

Instructions

- 1
  Place 1-inch graph paper on the table. Tape down the corners. Determine how much area you have in your room for your countertop.
- 2
  Transfer the countertop measurements to the graph paper and draw a rectangle of your available size. Divide the length in half and mark the center line of the length.
- 3
  Move a compass point along the center line while holding the pencil point at the top of the center line. The further away you move the point, the more shallow the curve will become. Measure 1-inch from the top center point and make a second mark. Most cabinet bases are 24-inches deep. Your countertop will generally be 25-inches deep with a 1-inch overhang.
- 4
  Draw a curve through your top center point mark to each side of the available area in the rectangle. Do not move the compass point. Draw a second curve through your 1-inch from the top center point mark. This represents your cabinet curve. Draw a third curve 1/12 of an inch from the second curve to represent your counter overhang. These are concentric circles. Once you have the size of curve you want, transfer the measurements to the countertop.

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