| 摘要 |
Electronic measuring and control of countersinking depth and/or failure of a drilling tool. Eddy current proximity detecting means is utilized for stopping and retracting the countersink drilling process after a pre-selected depth is achieved wherein a visual indication of the countersink depth is provided by way of sequentially lit LED segments through structure for detecting a surface up and away from the working end of the tool thereby avoiding contamination problems. Further, detection of vibration or chatter in the workpiece is shown as a means for detecting tool defects.
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