![]() The solution was a modified tap from North American Tool. The caused premature wear and stress on the that thread in the flutes and eventually to catastrophic failure. Instead, because the diameter was of the hole was so large the cut tap did not engage the threads along the chamfer length and instead engaged at the first full thread at the end of the chamfer. As was stated above the operator thought that by increasing the drill diameter size would lead to better tool life. Such was the case with the application porblem. When using oversize hole diameters, the tap should also have an oversize chamfer point diameter so all threads in chamfer are cutting and not just dropping in a hole. In higher tensile steels, larger hole sizes (less percentage of thread) may work better to reduce torque in tapping.
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