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Step-by-step build — 10 steps. Also available as a print sheet.
Cut the pieces according to the cut list. Refer to the cut diagram for pictures of the angled cuts. - Top octagon and lower octagon pieces: both ends cut at a 22.5 degree angle so they angle toward each other. - Leg pieces: both ends cut at a 10 degree angle so they are parallel. - Bottom center piece: both ends cut at a 10 degree angle so they are angled towards each other. - Bottom side pieces: one end cut at a 10 degree angle. For the top support pieces, you can rip the outer ends at a 45 degree angle to give it a slope (see step 5 image for details). Or you can sand a slope in the ends once assembled.
Tip: Cut the 8th piece to fit If your angles and cuts are not perfect, the last octagon piece may not fit without gaps. Instead, cut and assemble 7 pieces together then lay the remaining 2x4 piece under the octagon where the 8th piece will go. Trace the lines you need to cut. Then add pocket holes and secure it to both sides for a perfect fit.
Using glue and 1 1/4" brad nails, attach the lower octagon pieces to the underside of the finished top. Line up the angled edge of the lower octagon pieces with the seams in the top as you attach them. If they are slightly off, don't worry too much, they are well hidden when the birdbath is finished.
Set your pocket hole jig to drill holes in 3/4" thick material and drill 2 pocket holes in the non-angled end of the top support sides. Attach them to the center of the top support center piece with glue and 1 1/4" pocket hole screws.
Center the assemble support on the underside of the assembled octagon. Use the Quick-Flip tool to drill a hole where the support sits on the lower octagon pieces. Only countersink the screw head about 1/4". Secure with 2 1/2" pocket hole screws.
On the 1 1/2" wide underside of the 2x3 bottom pieces, drill pocket holes set for 1 1/2" thick material in both ends of the boards. Attach the bottoms to the legs so the center is between 2 leg boards and the angled edge of the sides are attached to 1 leg board. Secure with wood glue and 2 1/2" pocket hole screws.
Attach the 4 legs together at the bottom boards so the two sides are centered on the bottom center board. Secure with 2 1/2" pocket hole screws and wood glue.