Gluing An Octagon

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plywood. But since the ends may be off, position the half-frame so the two long corners extend beyond the edge of the plywood and the two short corners are flush to the edge, see Fig. 2a.

making the curs. Next, run the plywood carrier through the table saw, trimming off the long corners of the half-frame. Repeat the procedure on the other half-frame. Now the two halves can be glued together without a gap.

■ When cutting miters for an eight-sided frame (such as the Oval Mirror on page 18), there's always a good chance for error.

Each of the pieces requires two miters (one on each end) for a total of 16 cuts. If the miter gauge is off just Va, the combined gap would be about W when the pieces are assembled.

There's a trick to creating tight joints all around the frame. The trick involves assembling two "half-frames," then cutting the ends of each half-frame to fit together tightly, see Fig. 1.

half-frames. Start by cutting all eight frame pieces. Then glue up four pieces (half the frame).

Shop Note: When assembling, I don't use clamps — just hand pressure. Apply glue to the mating surfaces and press them together for about 30 seconds.

plywood carrier. After the half-frames are dry, I use a piece of plywood as a cut-off table for the half-frames, see Fig. 2.

To cut the plywood, set up the fence on the saw a little wider than the glued-up half-frame and rip the plywood so the edges are parallel. Now the half-frame is taped to the plywood with double-sided carpet tape.

Here's the key to the technique. If the miters were all cut perfectly, the two ends would align flush with the edge of the

PLYWOOD CARRIER

PLYWOOD . CARRIER

WORKPIECE IS CARPET-TAPED TO CARRIER

LONG CORNER

TRIM ENDS OF HALF-FRAME FLUSH WITH CARRIER

SHORT CORNER

LONG CORNER OVERHANGS CARRIER v

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Wood Working 101

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