![]() ![]() ![]() But it’s the machinist who decides which tapping style to use depending on the job at hand. Compare that to cut threads, which because of the tools used, cause grain structure to essentially fracture.Īlso, formed taps have a longer life, as they last about three to 20 times longer than cut taps.Ĭutting taps and forming taps both have benefits and limitations from stronger threads to greater compatibility. But machinists aren’t limited to the materials when they decide to cut taps.Ĭutting taps also have the upperhand regarding horsepower, as this threading method requires less power than forming taps.įormed threads are stronger because the grain flow of materials is compressed at the crest and root of the thread form. ![]() When machinists use forming taps, they can only use the process on aluminum, soft steel and nonferrous metals. The two threading methods tap holes differently, but they also have a handful of other differences, starting with the type of thread each method produces.Ĭutting taps are more versatile than forming taps and can be used with more materials. Additionally, forming taps usually require a larger hole because this style causes a material to thread away and into the threads of the tap. Forming taps involves the displacement of a material (like metal) within a hole. Use the correct tapping drill size and type of tap. Choose the correct lubricant (Choose Ultra S/P Super Premium). Unlike cutting taps, forming taps create external threads. Use a pitch controlled tapping attachment. The forming action creates heat and can work harden the material being formed. Speed Roll form taps should be run at 1-1/2 to 2 times the speed of a cut thread tap for a given material. This gradual cutting motion allows a tap to smoothly enter a hole. Just as important, rolled threads are stronger than cut threads because the metal grains are deformed along the thread contours. This process then leaves an internal thread that meets the machinist’s desires.Ī machinist achieves that geometric precision by using tools that come with a feature called the chamfer, which cuts a 90-degree angle or edge to make it more symmetrical. Cutting a tap means using tools that remove material from the tapped hole, according to North American Tool. Suggested Feed & Speeds for High Speed Steel Taps Taps - SFM Threads per In. When machinists need to create internal threads, they opt for cutting taps. Cutting taps and forming taps produce threads that are interchangeable and gauge identically, but those are the only similarities between the two tapping styles. ![]()
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