| 摘要 |
A machine tool 10 comprises a support 20 mounted for rotation about a machining axis 22 , a first motor 28 operable to rotate the support about the machining axis, a tool holder 30 mounted on the support for rotation about a tool positioning axis 32 which is parallel to and off-set from the machining axis, a second motor 50 operable to rotate the tool holder about the tool positioning axis, and control means 60. For a constant diameter machining circle, the support 20 and the tool holder 30 are rotated about their respective axes at equal angular velocities so that they rotate as a unit. To adjust the diameter of the machining circle, one of the motors operates for a period at a different angular velocity to the other motor, thereby altering the position of the tool holder 30 relative to the support 20 about the tool positioning axis 32. |
