![]() Selecting a single round coolant hole may be good for a machine with questionable coolant pressure as it will create a stronger stream at the tip. ![]() The easiest way to determine which configuration is best, is to consult your gun drill manufacturer and have them guide you based on your hole requirements.Īs in most all metal cutting applications, it is important that you are able to evacuate chips from the cutting area quickly and also cool the tool. Nose grind will determine how the chip is formed and the relief will influence hole finish and coolant flow. In that case you are better off using an N-4 nose grind and R4 relief. This is fine for steel, inconel, and stainless steel but what if you are using aluminum or brass. Most gun drill manufacturers will supply a general purpose N-8 nose grind and R1 relief unless specified otherwise. Let's go thru 5 common mistakes that are made when selecting and using a gun drill. Most machinists and engineers are familiar with twist flute drills as they are certainly more common than gun drills, so its not unexpected that many don't understand how to select the best drill for their application. Selecting and using a gun drill for deep hole drilling can sometimes be confusing.
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