![]() Then use a serrated knife to cut out the plastic foam slightly to the inside (1⁄4 inch), so that hole is a bit too small. Again, score the outline of the 5-by-7-inch piece of glass. Step 3 Daniel JohnsonĪ glass window on the top of the incubator is very handy for allowing you to monitor the temperature, humidity and eggs without opening the lid. Once that is complete, you can screw the housing box to the plywood case with 5⁄8-inch screws. ![]() You’ll also need to drill a 3⁄4-inch hole in the wooden case right behind the box to allow for the electrical cord. Then carefully cut this shape out of the plastic foam. On the back of the cooler, toward one side, use a pencil to score the rough shape of the light fixture housing box (as shown). Next, begin the slightly messy job of making some cuts to the cooler. Finally, use the two 11-by-27¼-inch pieces to add the long sides. Add the two 11-by-16½-inch plywood pieces to create the short sides. Use the 16½-by-26¼-inch piece of plywood as a base. Using wood glue and 1-inch nails, create a five-sided cube, leaving the top open.
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