CompoTech invited to present the use of composites in machine tools at the forthcoming International Machine Tool Engineers Conference, Tokyo, on the 1st November.
The real benefit to machine builders is the improvement in Dynamic Damping. Everything vibrates at it's own natural frequency and every material has a damping coefficient, ζ (zeta) which is the rate of vibration decay.
CompoTech have developed new composites that have the ability to dissipate vibrational energy.
Tests were done by comparing 3 Spindle Tubes:- with and without a simulated tool of 30kg
Each with the same dimensions, 415 mm x 170 mm, and each tested with the same 4000 N load. It was shown that the Graphite Carbon Damping Spindle Tube has nearly double the Natural Frequency, 12 x better Dynamic Damping and 7 x better Dynamic Stiffness.
It was shown that not only do Carbon-Graphite-Damping Composites have a higher stiffness and a higher natural frequency, but they also have a lower response at the points of sympathetic vibration. This reduces the response to excitation frequencies and should permit higher accuracy and / or higher cutting speed. The productivity of “Removing Metal” should be significantly better.