9/28/2023 0 Comments 1024 thread forming plug tapThe thread forming tap as claimed in claim 7, wherein said at least one cutting part is located between an adjacent two of said grooves.ĩ. The thread forming tap as claimed in claim 1, further comprising a groove formed in said outer peripheral surface of said main body between each adjacent two of said radial portions.Ĩ. The thread forming tap as claimed in claim 3, wherein a root of said chamfer part is formed smaller in depth than the root of said parallel thread portion, and said cutting part is formed at said root.ħ. The thread forming tap as claimed in claim 1, wherein said thread part is provided at the rear end portion with a run off which gradually decreases in diameter towards the rear end, said cutting part has an outside diameter nearly equal to the inside diameter of the internal thread, said cutting part is adjacent said run off and is configured so that when said main body is turned in said first direction, the crest of the internal thread is cut off after the internal thread is formed.Ħ. The thread forming tap as claimed in claim 2, wherein a root of said chamfer part is formed smaller in depth than the root of said parallel thread portion, and said cutting part is formed at said root.ĥ. The thread forming tap as claimed in claim 2, wherein a plurality of grooves extending in the axial direction of said main body are formed in the peripheral surface of said main body, and said cutting part is provided at a position of said radial portion between said grooves adjacent to said chamfer part.Ĥ. The thread forming tap as claimed in claim 1, wherein said thread part is provided at a tip portion with a chamfer part formed to gradually decrease in diameter as it extends away from the tip of said thread part, said cutting part has an outside diameter nearly equal to an inside diameter of the internal thread, and said cutting part is configured so that the crest of the internal thread is cut off when said main body is turned in a second direction which is opposite to said first direction.ģ. A thread forming tap comprising a plurality of radial portions disposed on an outer peripheral surface of a main body to form a thread part, said radial portions on said main body being configured to plastically deform an inner peripheral surface of a material to form an internal thread when said main body is turned in a first direction, wherein at least one cutting part configured for cutting the crest of the internal thread is formed between radial portions in the peripheral direction of the thread part.Ģ. But it’s the machinist who decides which tapping style to use depending on the job at hand.1. 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. Unlike cutting taps, forming taps create external threads. This gradual cutting motion allows a tap to smoothly enter a hole. 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. 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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