Core drill for drilling hole in workpiece, has bit for drilling hole and section that comprises bit for cutting thread and is detachably connected with drill, and mechanical elements realizing detachable connection of drill with workpiece

摘要

The drill (101) has a bit (103) for drilling a hole and a section that comprises a bit for partially cutting a thread. The section is detachably connected with the drill. A switch detects penetration depth of the drill, where the switch causes rotation direction reversal of the drill after manipulation. A holding device has mechanical elements realizing detachable connection of the drill with a workpiece. The holding device has an adhering unit for adhering a bearing surface of the holding device with the workpiece.