Errors in measuring the drilling resistance of pine and spruce wood by the device resistograph

To assess the quality of the stem wood of growing trees, a Resistograph device is used, the principle of which is to measure the resistance of wood to drilling. The results of the device are influenced by a number of factors, primarily the drilling depth and the degree of bluntness of the cutting edges. The purpose of the study is to assess the systematic measurement error of resistance to drilling of pine and spruce wood with a Resistograph device. The research was carried out in the Arkhangelsk forestry. Drilling was carried out sequentially in turn from the first tree to the next in the north-south direction and then returned to the first tree again, retreating from the previous drilling  up 1 cm. Drilling began at a height of 80 cm from the root neck. In total, 140 resistograms were analyzed for each tree species. The resistograms were smoothed by the standardized assessment method (z-score). The errors were estimated by calculating the differences between the values of the drilling resistance of the corresponding sections of wood or between successive drills for the same drilling interval for each tree. Regression analysis of the drilling resistances of spruce wood allowed us to obtain the following equations for estimating errors: with wear of the cutting edges,  R´ = 0,17х´ – 13,62, where х´ is the total length of drilling, cm; with increasing drilling depth, R´´ = 0,27х´´ + 8,56, where х´´ is the actual drilling depth, cm. According to the analysis of pine wood resistograms errors: when the cutting edges wear out, R´ = 0,15х´ + 23,67; when the drilling depth increases, R´´ = 0,92х´´ + 7,59. Therefore, to estimate the true value of the wood resistance to drilling with the Resistograph device, it is necessary to subtract the errors R´  and R´´ from the obtained value.

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