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MEMBER Forest Operations; Pulp, Paper and Bioproducts;

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Summary

The recent development of a circular saw temperature sensor makes the measurement of saw temperature possible. Previous experimental tests and mill tests on multiple saw machines and several sawmills confirmed that monitoring saw temperature during sawing provided useful information to diagnose sawing and lubrication issues. It was also shown how to compute the cooling capacity of the guide lubrication system from the recorded temperature data. However, it is not known how large a temperature is safe for a saw. This information is needed to assess whether a saw is operating in a safe range or approaching at critical point where the saw loses stiffness or dishes, causing snaking or mismatch. In this project, a computer model of guided saw is developed. The model is used to predict the critical temperature for a saw, based on its geometry, rotation speed, and the cooling capacity of the system. In this report, first a general example of a guided circular saw is solved with some assumed parameters. Then the recorded data from actual sawmill tests (four different machines from different sawmills) is used as the input for the model and the safe critical temperature is calculated for each case.

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