How To Make A Round Picture Frame

How do I make a circular frame?

I'm making a large circular frame to trim out a round window in an quondam business firm. The exterior diameter needs to exist 22", and the inside diameter 14".

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Q:

I'm making a large circular frame to trim out a circular window in an old firm. The outside diameter needs to exist 22", and the inside diameter xiv". I would like to use the same 5"-broad board so the grain is continuous. Given the dimensions of the circumvolve and the lumber, how do I figure out how many segments to make, and at what bending is each to exist cut?
—Craig Vanaken, Aloha, Ore.

A:

The more segments you lot combine to brand a circle, the smoother the grain appears to flow between segments, Craig. For the diameter of your circle, eight segments should exist plenty. Also, this makes the necessary 22.5° miter angles easy to cutting.

First, on a 2'-foursquare slice of paper, use a compass to describe two concentric circles with 11" and 7" radii. And then draw a line through the center and use a framing square to describe a perpendicular line dividing the circle into quarters. Using either the compass or a ruler, separate each quarter in two for a total of eight equal sections.

Because yous don't want to risk ruining your lumber, do on a 5"-wide strip of ¾" plywood to fine-tune your miter gauge setting and assembly technique. Use the circumvolve to determine the last outside length of each department, and cut your board slightly oversize. (In this example, we cut ten" blanks for nine½" sections.) With a miter gauge and auxiliary extension, cutting 22.5° angles on i end of each piece. And so, set a miter gauge stopblock to cut the sections to last length.

Assemble two half-circles of iv pieces each, like the one shown above, using biscuits for alignment, and tape to hold the pieces tightly together.

Next, cutting your newspaper pattern in half, and clip out the half-circles to within well-nigh ½" of the within and outside lines. Spray-adhere a half-pattern to each half-circle gum-upwards. Bandsaw and sand both to the pattern lines, leaving just a piffling actress on the within and outside of the ends. If your miter gauge is misaligned, you may demand to file or sand the ends of the half-circles for a tight fit. Glue the two one-half-circles together, then sand the joints smooth.