| 摘要 |
The control device is useful on material removing machine tools, such as grinders, for producing a conical surface on rotating bodies of revolution, particularly disc valve bodies, having a reference surface perpendicular to the axis of rotation. The device comprises a measuring fork having facing stops, engageable with the conical surface and the reference surface of the workpiece, respectively, and spaced apart a preselected distance. This fork is on the lower end of a freely pivoted arm which is swingable about a pivot axis parallel to the axis of rotation of the workpiece and preferably included in a vertical plane including the axis of rotation of the workpiece. An adjustable spring biases the arm to swing the fork in a direction to press the stops against the respective workpiece surfaces during machining of the conical surface, and the spring biases the fork to swing through and beyond such vertical plane when the conical surface and the reference surface of the workpiece have the preselected distance from each other. A feeler or the like may be associated with the arm to engage a control element to interrupt the machining operation at such time. A retracting arrangement is provided to swing the fork back to its starting position.
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