Importance

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Abstract

Three columns 10, 20, 30 are set up in an approximately triangle arrangement. A saddle 51, which fixes a main spindle 50 thereto, is held in contact with a side face of the column 10, 20 or 30 or a brace 40 which unitarily connects two or three of the columns 10, 20, 30. A plurality of chucking tables 4a, 4b are installed in an indexing table 2a. When a work piece 5b attracted onto one chucking table 4b is carried to a position below the main spindle 50, the other chucking table 4a is located at a loading-unloading position. Since the main spindle 50 is located at a geometrical gravity center of a triangle defined by the columns 10, 20, 30, a reaction force which is generated during machining is uniformly distributed to each of the columns 10, 20, 30. Consequently, the columns 10, 20, 30 are prevented from deformation which causes inclination of the main spindle 50, and the machined work piece has superior flatness.

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First Claim