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An  easy basic step is to assemble a 90 degree arc. 

Place the two ends at the edges of a sheet of plywood. 

Measure from the center rail to the corner.  Make sure both center rails are the same distance to the corner. 

Double that number, that is the O-number..  The diameter of your circle.

If you reading is 36", it is 0-72.

If your reading is 27" it is 0-54.

Last edited by Tom Tee

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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