For what it’s worth, most of the weighed text books were woodworking related. The results are shown in the table below. To help decide which load levels to test, I weighed various items in the home library. Note that no attempt was made to simulate a centrally loaded bookshelf - I felt that this scenario was less common plus I didn’t have the energy to run hundreds of additional tests. But, these differences were usually on the order of one to two hundredths of an inch so I didn’t fret too much over them. This turned out to be something of an inexact science if one particular weight is shifted a couple inches in any direction, this can result in a slightly different deflection measurement. This involved arranging cement blocks and steel weights as evenly as possible across the shelf span. The objective was to simulate a uniformly loaded bookshelf with typical loads placed on it. Three different shelf load levels were tested, representing light, moderate, and heavy loads: The thinking here was that these types of materials are typically used for utility shelves so why not use utility grade wood for the edging. For the plywood and MDF shelves, pine edging was used. For the solid wood shelves, the front edging was made from the same type of wood as the shelf. The idea was to start with a shelf with the least amount of support (a floating shelf) and go to progressively greater support levels. Fixed with front and rear support – ends secured with clamps, front edging, rear beam support. ![]()
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