Principle of reverse chamfering knife

Working principle: When the front guide of the chamfering knife enters the hole, the 45-degree cutting edge on the blade relies on the elastic strength of the tool holder to chamfer and deburr the hole surface, and then pass the hole. The end opposite the entry hole is chamfered and deburred. The blade through hole relies on elastic contraction to change the outer diameter of the blade. The outer corner of the blade circumference is chamfered. There will be no cutting or damage to the original hole wall when the hole is passed. After the hole is passed, it will naturally open to achieve chamfering. When the cutter body penetrates into the lower end of the hole wall, whether it is open or closed, chamfering will occur accordingly. Especially when the cutter is retracted, the blade closes and the inner end angle of 33 degrees changes to an approximate 45-degree angle, which can achieve an approximate chamfering 45 degrees.