Specialize in industrial tools and machine tool accessories since 1993

What You Need to Know about Forming Taps?

by:PRECO     2020-07-20

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Today, most of the threads produced in the manufacturing industry are machined with cutting tools: taps and thread milling cutters usually used for internal threads, thread dies and thread milling cutters used for external threads. These tools are historical standards used for this purpose and are familiar entry tools for mechanics. As processing materials and applications change with customer needs, alternative tools follow. Although both cutting tools and forming tools produce basically the same threads and gauge in the same way, their use requirements and results obtained are different in many ways.

A tap is a tool for processing internal threads. According to the shape, it can be divided into spiral flute taps, blade inclination taps, straight flute taps and pipe thread taps. According to the use environment, it can be divided into hand taps and machine taps. For metric, American, and British taps. The tap is the most mainstream processing tool used by manufacturing operators when tapping.

The threads produced by cutting taps and forming taps are interchangeable and have the same specifications, but this is the only similarity between the two tapping styles.

Cutting tap
When machinists need to create internal threads, they choose cutting taps. According to Preco Tool, cutting taps refer to the use of tools to remove material from threaded holes. Then, this process leaves internal threads that meet the mechanics' expectations.

Machinists achieve this geometric accuracy by using a tool with a function called chamfering, which cuts into a 90-degree angle or edge to make it more symmetrical. This gradual cutting motion allows the tap to enter the hole smoothly.

Forming tap
Unlike cutting taps, forming taps produce external threads. The forming of the tap involves the displacement of the material (such as metal) in the hole. In addition, forming a tap usually requires a larger hole because this pattern will cause the material to unscrew and enter the thread of the tap.

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Why You Should Be Using Forming Taps
Forming taps are ideal for tapping blind holes, but can be used for any tap application in ductile materials including steel and certain stainless steels. Forming taps have lubrication grooves, but there is no cutting surface, and they will not cut threads or generate chips. They form threads by applying pressure on the thread material, thereby eliminating chip blockage in the chip flutes.

This type of tap is suitable for lathes, radial drills, machining centers and tap heads. In order to increase production, their operating speed is twice that of traditional cutting taps. Because the forming process pushes the material into a thread form, it has a stronger cutting action than a tap to remove material. Since there is no blunt cutting edge, compared with similar cutting taps, the number of tapping holes for forming taps is increased by 5 to 10 times.

How to use thread forming taps
1) When tapping, insert the nose cone first to make the center line of the tap consistent with the center line of the drill hole.
(2) Rotate the two hands evenly and apply a little pressure to make the tap enter the knife, and no pressure is needed after the knife is entered. (3) Each time the tap is turned, it is reversed by about 45° to cut off the chips to avoid blockage.
(4) Do not increase the rotation force if the tap is difficult to rotate, otherwise the tap will break

Each style has its advantages and limitations. Which decision to use usually depends on the limitations of the job, but is usually influenced by the experience of the mechanic. If you want to find a good thread tap, please look for PRECO!                                

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