| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a rotary spindle device in which a balance adjustment can be performed easily for a short time and workability relating to the balance adjustment is improved. <P>SOLUTION: In a main spindle device 1, holes 11, each of which extends from a rear end face in parallel with an axial line of a main spindle 3 and has a female screw part 12 along an opening-side inner circumference in the main spindle 3, are provided at a plurality of positions at equal intervals in a circumferential direction on a concentric circle with the axial line. A rod-like weight member, with which a male screw part being able to be screwed into the female screw part 12 and having an axial direction length shorter than the female screw part 12 is formed in an end, is inserted into each of the holes 11, respectively. A screwing depth of the male screw part to the female screw part 12 is set for each weight member. Therefore, the balance of the main spindle 3 can be adjusted by moving the weight member in the axial direction. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
