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Think that engineering is just for major structures? Not necessarily. Kitchen cabinets are often subjected to some serious loading. This usually leads not to disaster and lawsuits, but occasionally to a lot of embarrassment on the part of the builder if a cabinet sags or slips off the wall. Gravity vs. Wood Screws Take a basic wall cabinet: It's 36 inches wide and 12 inches deep, with three shelves and an accessible top surface. Now let's fill it up and see what it weighs (see illustration, next page). Weights and measures. A can of soup measures 4 inches high, 21/2 inches in diameter, and weighs 13 ounces. Some quick arithmetic shows that you can pack about 14 of these