![]() Longer Tap Life: forming taps can last 3 to 20 times longer than cutting taps because they have no cutting edge to dull.Since the metal’s structure is cold worked along the thread profile, the threads produced are generally stronger and have a smooth, burnished surface finish. Stronger Taps: the absence of chips eliminates the need for flutes, resulting in a solid, stronger tap.Because no metal is cut away, the possibility of producing oversized threads is greatly reduced. Better Thread Gaging: forming taps rearrange the metal in the hole to create the thread.This is especially true for materials that work-harden such as steel and stainless steel. ![]() Stronger Threads: the grain flow of formed threads follows the contour of the thread, resulting in greater thread strength.Making threads without chips produces excellent thread surface quality, eliminates the risk of poor threads due to axial “mis-cutting”, increases static and dynamic strength of threads and allows elevated tapping speeds. Chip-less Tapping: since threads are formed and not cut, there are no chips to interfere with the tapping process or cause chip-removal problems in blind holes.However, suitable materials react to form tapping in different ways. Tapping via form tapping is appropriate for materials with tensile strength less than 1,200 N/mm 2 and fracture strain of 5 percent or less.Īs a rule of thumb, if a continuous chip is created when drilling, then the material is likely malleable enough and a good candidate for form tapping the threads. This larger hole is generated to allow room for the material to flow to create the minor diameter of the thread.įorm tapping is typically used in steels, stainless steels, light metal alloys and non-ferrous materials. One thing to really keep in mind is that form tapping requires a larger drill than a typical drill size for a cut tap. Roll form tapping has several benefits over cut tapping such as faster cutting speeds, stronger threads, no chips generated, stronger tap and longer tool life. Good chip evacuation minimizes thread damage and prevents tap breakage.Form tapping, also known as Roll Form tapping, is typically used in applications where traditional cut tapping is unsuitable. ![]() The spiral grooves transport the chips out of the drill hole upwards, which prevents the chips from clogging the grooves. Taps with right-hand spiral grooves are particularly suitable for blind holes. The chips are removed in the cutting direction. The chip removal of these tap types takes place below the hole. Taps with left-hand spiral grooves are suitable for through holes. Taps with straight flutes are not suitable for deep threads as there is hardly any chip evacuation.ĭetailed view: Tap grooves (spiral groove) of a machine tapĪ distinction is made between taps with left-hand twisted and right-hand twisted spiral grooves: Left-hand spiral grooves on taps ![]() Straight fluted taps can have the form A, C, D or E. They are suitable for both through and blind holes. Universally applicable, mainly for short-chipping steel and cast iron, they form the basis of the taps. Taps with straight groove are the most commonly used taps. All flute shapes can be found on both cut-in taps and machine taps.ĭifferent tap grooves: Spiral groove, straight fluted with peel point and straight fluted In hand tap sets, all taps are straight fluted. A flute can have different shapes designed for its use, which can cause the material removed to be ejected in a different way. A groove on taps is required to make room for material removal during tapping. ![]()
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