There are many kinds of bit structures, and the structure of Extra Long Wood Drill Bit must meet the following requirements:

1. The cutting part suitable for drilling conditions must have normal angle and size;

2. When drilling, the chips can be separated freely and discharged out of the hole in time as they are formed;

3. It can be grinded many times conveniently, and the angle value and main dimension parameters of the cutting part after grinding are unchanged;

4. Maximum productivity and good processing quality.

The structure of drill bit depends on its working conditions: relative to the drilling direction of fiber, drilling diameter, drilling depth, and required machining accuracy and productivity. The following common structures of extra-long wood drill bit are mainly introduced.

(1) The end of the cylindrical head center drill bit is cylindrical, with two cutting edges and a spiral groove. This drill is mainly used for drilling shallow holes with horizontal stripes, but the drilling depth is deeper than that of flat drills at a larger feed speed.

(2) Drill the round counter cutter bit in the center of the round counter cutter and the toothed counter cutter.

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