![]() ![]() 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. (mm) ( of Thread Desired x mm Pitch) 147.06 (EXAMPLE M8 x 1.25 Tap with 65 Thread) 8 (65 x 1.25) 7.45 mm Dia. 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. High speed steel Ground thread Dies, with two or more thread - forming edges integral. 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. Twist drills, gun drills, combined drills, countersinks and. Plug Style: Generally used in thru holes. Taper Style: Starts the thread square with the workpiece. The most commonly sold taps are hand taps (sometimes called bolt taps) and they are appropriate for tapping the vast majority of materials in through or blind holed conditions. In higher tensile steels, larger hole sizes (less percentage of thread) may work better to reduce torque in tapping. Taps are available in many types such as Hand Taps and Pipe Taps. ![]()
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