SCANNING & OPTIMISATION – On the frontline The placement position of PGLR system in the log line


The PGLR system


improves recovery by getting the log closer to the ideal rotation angle called for by the turn optimiser –


Paul Green, USNR Optimisation Engineer


position and provides feedback, through the optimiser, to the PLC to adjust the cutting tools accordingly. The PGLR system improves the machine’s ability to achieve the optimal breakdown for each log as it is being processed. The final breakdown solution is based on the actual position/rotation of the


log, rather than on the assumed position.


Testing for turn Optimisation Engineer Paul Green worked on the development of the PGLR system. He explained the theory behind its design: “The PGLR system improves recovery by getting the log closer to the ideal


rotation angle called for by the turn optimiser. Studies have shown that on log turners running without any correction, the standard deviation of the turn error can be much higher than most people think. Part of the reason this surprises people is that rotation accuracy studies are very time consuming to do, so


most mills don’t know how their machine is performing. “USNR has a history of experience measuring the performance of log turners starting with manual angle measurements; Precision Log Rotation (PLR) using ink stripe and camera; and now our PGLR laser scanning system to measure and


The large log line is fed by two feed modules depending on the size of the log 22 International Forest Industries | FEBRUARY/MARCH 2012


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