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Thank You. This is a great project if you just casually use your tools. Batteries are way too $$$$.I have a dozen old Ryobi 18 volt batteries that I was someday going to rebuild.But I am too busy with my tools and found the new Lithium Ion Batteries are well worth the price especially if you can wait for a holiday sale.Now they will go to the yearly hazmat collection or back to HD for recycling.I might even consider rebuilding them using 18650 Lithium Ion Batteries If I knew a way to charge them without causing an explosion. Also finding quality 18650 batteries that do not have fake capacities at a reasonable price would be a challenge.
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I watched my father make a work bench like this when I was a kid. I have made several over the years. I prefer to spend the money for plywood to avoid the finishing, strength and moisture problems of MDF. I use Tempered Hardboard for a finished top or to renew the top when the original gets chewed up.3/4 inch ply with 2 X 6 under the table and 4 X 4s for the legs with 2 in the center. This supports my heavy lathe. Also good for hammering sheet metal on. Downsize the the plywood to 5/8 or even half inch for lightweight stuff like electronics workbench. I like your shelf design and think I will build some of those.
There is nothing complex in that simple box fan motor to be damaged by a modified square wave inverted. It is a relatively low wattage system. A salvaged auto radiator fan is a very high current draw motor and would quickly run down your battery.The cheap box fan is a very well designed energy efficient system for moving air. I do not think you could have developed a more energy efficient system.I may try a mini bug vac system for my home using a 6 inch computer fan. I would use a light to attract other bugs.You may want to research COW VAC, a system for removing flies from dairy cows.
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