Advances in Machine Tool Design and Research 1969. by S. A. Tobias

By S. A. Tobias

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Extra info for Advances in Machine Tool Design and Research 1969. Proceedings of the 10th International M.T.D.R. Conference, University of Manchester Institute of Science and Technology, September 1969

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Theory and Practice of Fluid Dampers in Machine Tools 63 C. BORDER E F F E C T Experimentally the value of the natural frequency of this device was found to be 123*7 cps. A difference of 2-3 % is found. It was shown that the border effect is the reason for this discrepancy and that in first approximation it can be taken into account by adding the gapwidth to the radius. In other words, by making the computation with R = 0-051 m instead of JR. = 0-050 m the computed value of the equivalent oil mass is 2-361 kg instead of 2-186 kg.

J. Bollinger*9) and Dr. M. P. by Dr. Cowley. In 1966 P. Vanherck made an application of fluid dampers to machine-tool spindles*11*, and Dr. *12* In 1968 P. *13) In this paper we want to focus our attention on these problems. The theory as well as the praxis of a dynamic absorber shows that the optimal turning of the dynamic absorber must be made in function of the natural frequency and damping of the main system. Especially the natural frequency of the main system must be fixed. Facing the problem of a spindle, the mass of the workpiece is important with respect to the equivalent mass of the main system and determines its natural frequency.

The difference in natural frequency amounts to about 25 % of the originally computed one. Theory and Practice of Fluid Dampers in Machine Tools 63 C. BORDER E F F E C T Experimentally the value of the natural frequency of this device was found to be 123*7 cps. A difference of 2-3 % is found. It was shown that the border effect is the reason for this discrepancy and that in first approximation it can be taken into account by adding the gapwidth to the radius. In other words, by making the computation with R = 0-051 m instead of JR.

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