Abstract
Various advantages exist if it is possible to miniaturize machine tools to fit processing object. However, simply miniaturization of a machine tool ordinary decreases the rigidity of the machine tool, and it cause decreasing of the accuracy and performance. For a miniaturization of machine tools that keep their rigidity, we proposed a new structure of small milling machine that have a work space in the shell structure. Next, the difference from usual machine tools in design was considered. Moreover, a FEM analysis was executed for spherical shell models with proposed structure, and it was shown that making a proper thickness distribution is important to enhance rigidity.
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