Time and yield on the sawing process of Eucalyptus globulus Labill, with circular and band saw

In order to determine the times and performance in the transformation process of round wood to squared wood of Eucalyptus globulus, a research was carried using circular saw (sawmill A) and circular saw more band saw (sawmill B). The sizes of the samples were 210 and 205 logs. To know the conversion time of the logs, the return-to-zero method was used and in the yield the sawn volume was related to the roll volume of the logs. The result indicate a significant behavior, whose times when processing 1.000 pt (2.36 m 3) are of 112.73 with circular saw and 167.36 minutes by means of the circular saw system plus the band saw. With yields of 27.74% in the sawmill A and 48.84% in the sawmill B, means that for each cubic meter of round wood (m3. r) processed, 117 pt and 207 st of sawn wood were obtained respectively. Finally, in the sawmill A, as the diameter of the logs increases, the yield and productivity increase. However, in the sawmill B, the yield diminishes and the productivity showed a variable behavior, due to the different number of logs evaluated by diameter class in each factory