A hole machining tool that can insert a bar in the drilled inner hole. The nesting drill can be rounded and the slit is only 3mm wide. You can draw a lot of round plates on a large plate. The nesting drill can have one or more high speed steel or carbide tips with guide blocks on the body to prevent vibration during cutting and to reduce the deflection of the holes. The guide block is made of a wear resistant material such as cemented carbide, bakelite or nylon. The body and the tubular drill pipe can be joined by welding or special square thread. In order to ensure the smooth flow of chips and reduce the cutting load, the cutting edges of the cutter heads are arranged in different shapes to make the chips narrower. At this time, the chip breaking table is ground on the front of each tooth to break the chips. Broken.
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