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PROCEDURES FOR CUTTING AND USING SAMPLE BOARDS 1. Select a few boards from the stack of lumber that represent the slowest drying material. These would be the widest, thickest, and highest moisture content boards. Boards that contain the most heartwood or are quartersawn are also suitable. 2. Cut a 24 to 30 inch sample that is free of knots and at least 12 inches from the end of the board. Then cut two one inch sections from the sample board as shown (see Figure A). Make sure to number the sections and sample board. Figure A: Dimensions of a sample board for controlling the drying process. 3. Immediately weigh the one inch sections (accuracy of about one gram required) and record the weight. Measure immediately after cutting since it is important that they do not gain or lose weight before weighing. 4. End coat the sample board with a roofing cement or commercial end coating (see Figure B). Now, weigh the sample board and record the weight on the sample (accuracy of 0.1 pounds). 5. Place the sample board in the lumber stack in a location where it will dry at the same rate as the rest of the lumber in the dryer (see Figure C). 6. Place the one inch sections in an oven 215oF to 218oF (102oC to 103oC) and dry – usually 18 to 36 hours depending on the oven. Reweigh and obtain the oven dry weight. 7. Calculate the moisture content of each section and average the moisture content (MC) of two sections to obtain the moisture content of the sample board. 8. Estimate the oven dry weight of the sample board using average moisture content and weight from step #4, and record this so it can be used for future moisture content calculations. 9. To determine the moisture content at any time, reweigh the sample board and calculate. %MC = [ Wet Weight - 1 ] x 100 Oven Dry Weight Estimated Oven = Wet Weight (Step #4) x 100 Dry Weight (100 + %MC) Current %MC = [ Current Weight - 1 ] x 100 Estimated Oven Dry Weight Figure B: Roofing cement and commercial end coating. Figure C: Stack of lumber with sample boards. APPENDIX C: Procedures for Cutting and Using Sample BoardsPDF Image | DH Drying for Small Woodworking Firms and Hobbyists
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