It is inefficient to machine the disc type workpiece by the scribing method. To this end, we have made a universal indexing drill. It is suitable for circumscribing holes of φ30～200mm disc type workpieces. The workpiece height can be used from 6 to 100mm. It is only necessary to replace the drill sleeves 6 of different heights (figure). If the workpiece is large, the same type of indexing turntable 2 and three-jaw chuck 4 can be used. In order to improve the drilling accuracy, the inner and outer jaws should be used.
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