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Figure 27. A single pair of prongs is appropriate for 4/4 boards, but thicker boards are usually cut somewhat differently. You are looking at representations of the end grain in these diagrams. For 4/4 boards, the prongs should be about one-quarter of the board thickness. As an example, for 4/4 boards you would mark out two prongs about 6”-8” long or so depending on the width of the board(s). The prong thickness ought to be 3/8” of an inch thick – about a quarter of the board thickness is right because thinner prongs too strongly indicate the stresses at the surface and won’t provide reliable results. In the 4/4 board shown below, the core would be removed with a bandsaw leaving one-quarter of the thickness remaining at each surface (Figure 28). Figure 28. Cross-section of board showing wood to be removed for a prong test. Samples cut before conditioning starts will probably have the prongs turn inwards, indicating that casehardening is present (Figure 29). 55PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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