2.5 Operating speed

Turikov, Shevchenko and Pashkov 1-1973], and Stakhiev and Lyzhm [1972] recommend an operating speed during sawing 15 percent below the critical speed. Note that the critical speed depends upon the blade temperature distribution during operation which is not usually known. Stakhiev and Lyzhin [I972] presented a nomogram for the determination of the critical speed for a wide range of saw diameter and thickness, taking into account the clamping ratio, and assumed temperature differences between saw periphery and its center. Pashkov and Bodalev also proposed a similar nomogram for determination of the optimum sawing parameters based on the assumed temperature differences between the rim and the clamping radius. The saw blade temperature distribution during production was measured with a radiation sensor. The on-line control of saw stability consisted of spectral analysis of the saw during operation and implementation of a spectral shifting technique using roller and thermal tensioning. The extension of the concepts to real-time, on-line methods of saw stability control is a continuing area of research.

Review

One problem with the research is the reduction the level of noise and vibration along with measures of improved production, cutting accuracy, and surface quality during woodworking circular saws. Reduction of kerf losses can be achieved by using thinner saws as long as blade stability can be maintained through blade design and on-line control. The current status of saw vibration control research is analysed here. The articles include vibration reduction and control through saw design and membrane stress modification, feedback vibration control, and methods for reduction of aerodynamically excited vibration noise.

The ideal process of cutting does not exist. Research found that the level of noise and indicators vibrations can be reduced by choosing the right design of circular saws and processing modes of cutting. This research is necessary, because reducing the level of noise and vibration will prolong the viability of the tool and improve the quality of the cut.