A. Based on my 50 years of experience in this industry, I believe that you are quite interested in yield. As a result, with the more knotty No.2 Common lumber, you are trimming the wood as close to the knots as possible. The wood around a knot that appears normal in color will actually be at a steep slope of grain. Some people might call this cross-grain. The wood in the proximity to a knot will actually glue like end grain instead of the more normal side grain. End grain and cross-grain are very difficult to glue successfully.
Further, cross-grain does warp a bit differently than the rest of the wood, so if the moisture changes, the regions with cross-grain will change shape or size differently.
It might be obvious at this point that when processing No.2 Common lumber, or any lumber with knots, is to make sure that the knot and any severe cross-grain associated with the knot is eliminated. The overall yield might drop a bit, but the yield of quality pieces will increase.
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Q: We are having a problem with shrinkage. We make furniture, but someone else sells and delivers it. This person claims he did everything correctly, including opening the furniture wrapping (we wrapped the furniture with shrink-wrap and it was fairly well sealed) and letting it acclimate to the house climate. When the customer moved in, they said the furniture looked really wonderful, but within a week, it started to warp, open joints and crack in a few places. We are so careful to keep our plant at 40 percent RH and check the MC of the lumber. This is frustrating! Can you help?
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