| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary table and a machine tool provided with the same, which rotary table can secure a high precision of its rotational motion by improving accuracy of an assembly of bearings. SOLUTION: The rotary table apparatus 10 has a rotary table 12 rotating with a shaft body 9 as a rotary shaft, and a supporting base 14 for rotatably supporting the rotary table 12, and is used in a machine tool 1 for machining a workpiece. The shaft body 9 has a first V shape groove 34 directly formed thereon along the its rotational direction. The supporting base 14 has a second V shape groove 32 formed therein so as to oppose to the first V shape groove 34. A plurality of rolling elements 23 are located between the shaft body 9 and the supporting base 14 so as to roll by being brought into contact with the two V shape grooves 32, 34, and further the rolling axes of respective neighboring rolling elements 23 are alternated by±90°so as to compose a cross roller bearing 30. COPYRIGHT: (C)2004,JPO
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