This outstanding development increases drill cutting efficiency by means of greatly improved chip control. A chipbreaker rib is positioned along the length of the flutes, which curls and breaks long chip forming material into small manageable chips for easier evacuation. There is no clogging of chips in the flutes, as small chips flow freely along the flutes. The chipbreaker drill thus cuts more freely than standard drills.
The small chips also permit coolant to flow more freely to the drill point, giving improved heat dissipation and drilling performance. As the chipbreaker rib extends down the entire flute length, the chipbreaker form and effect is retained even after conventional sharpening. The chipbreaker rib gives added rigidity, markedly increasing the number of holes per re-grind, even where chip control is not considered important.
The benefits of providing coolant internally directly to the drill cutting edge include higher cutting speeds (reduced times by up to 75%), higher feed rates, longer tool life (3 to 10 times), and less frequent resharpening. In addition, they provide a superior finish.
The coolant assists in clearing chips from the drill point and it’s pressure forces the swarf along with the flutes of the drill facilitating drilling to greater depths without repeated withdrawal to clear swarf.
Coolant tubes are located away from the drill web, thus not affecting web strength, and connect to all coolant systems.
Coolant can be provided by the normal coolant pump supplied with most machines using soluble oil. However, we recommend using a mist coolant at a pressure of 550 to 800 kPa (80 to 120psi). This method is clean and efficient, eliminating the problem of collecting, filtering and re-using the coolant.
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