| 摘要 |
PROBLEM TO BE SOLVED: To avoid exceeding tolerance of spindle deformation even a tool or a spindle collides with a machining jig or the like. SOLUTION: In a main shaft head of a machine tool which makes a spindle mounted with the tool circle around an axial line of a support shaft, two rotation members, composing a rotation transmitting mechanism for making the spindle circle and transmitting driving force of a rotation driving device, are fastened to each other by a bolt group at mutual connection parts as well as connected in a state of being prevented from relative rotation by friction force of the fastening. Rotation preventing torque based on the friction force is set to be larger than torque applied on the connection parts at the time of machining, and set to be smaller than the torque applied on the connection parts when an external force of generating deformation over the tolerance is applied on the spindle at the time of circling of the spindle. COPYRIGHT: (C)2009,JPO&INPIT
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