| 摘要 |
A fixture for use with a cutting tool, such as a saw or sander, and adapted to cut perfect circles in a workpiece. The fixture has a base which is adapted to be positioned on a work table in a predetermined relationship with respect to the cutting tool. A pivot arm is supported on the base at a first pivot point such that the pivot arm pivots on the base toward or away from the cutting tool in an arc centered at the first pivot point. A second pivot point is formed on the pivot arm and is adapted to provide a center point about which the workpiece is rotated. Stop means defines a working position for the pivot arm in which the workpiece center and the cutting tool are displaced by a distance corresponding to the radius to be cut. The operator pivots the pivot arm toward the stop and rotates the workpiece about the second pivot point so as to bring the cutting tool into the workpiece to the defined radius, following which continued rotation of the workpiece about the second pivot results in cutting of a perfect circle.
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