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Motor Type Vs. Machine Design
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 Do linear motors make a machining center better? Or, more specifically, do they improve dynamic stiffness? A study conducted by machine tool builder Mori Seiki suggests that the answer is yes, but with an important caveat. Applying linear motors alone is not necessarily the most effective way to improve stability. When it comes to dynamic stiffness, changing the machine design may offer more potential for improvement.Mori Seiki managing director Kazuyuki Hiramoto supplied the data for the graph on the following page. The numbers represent the test results for trials run on a test machine with and without linear motors, and with and without a machine-tool design concept called “Driven at the Center of Gravity,” or DCG. What the numbers specifically measure is the amount of vibration that resulted after the machine was moved and stopped. The point of the comparison is that some vibration can be attributed to how the axis motors work, but potentially more of the vibration results from where the force of those motors is directed. |
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