No need to ‘tap out’ when it comes time for threading holes

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Additional Information

Definitions of tap terms

Major diameter: On a straight thread, the major diameter is that of the major cylinder. On a taper thread, the major diameter at a given position on the thread axis is that of the major cone at that position.

Minor diameter: On a straight thread, the minor diameter is that of the minor cylinder. On a taper thread, the minor diameter at a give position on the thread axis is that of the minor cone at that position.

Pitch diameter: On a straight thread, the diameter of the imaginary coaxial cylinder, the surface of which would pass through the thread profiles at such points as to make the width of the groove equal to one-half the basic pitch. On a perfect thread, this occurs at the point where the width of the thread and groove are equal. On a taper thread, the pitch diameter (or simple effective diameter) at a given position on the thread axis is the diameter of the pitch cone at that position.

Pitch: The distance from a point on a screw thread to a corresponding point on the next thread measured parallel to the axis.

Troubleshooting

Metal working professionals often consider taps to be the tools of last resort because of these problems. Different work materials and machining conditions lead to an almost unlimited variety of tap geometries, material substrates, surface treatments and coatings. Such an array can cause headaches when choosing the right tap for the job.

Tapping can be the preferred option for thread making. However, it is important to find solutions that prevent a tap from advancing slightly faster than it should, have it accurately correspond to its own lead, prevent the width of space from being shaved too widely and prevent oversized threads. These solutions can be used to help produce an ideal thread form.

YG-1 said one solution is its “Combo Tap” for blind- and through-holes. The tool’s special thread form geometry solves tapping problems by acting like a brake to prevent the tap from over- or underfeeding, avoid axial miss-cutting and stop production of oversized threads. In addition, the geometry is said to compensate for cutting forces, which reduces tap wear and extends tool life.

The suppler noted that the tap also allows for increased thread relief as well as reducing torque, machine power consumption and friction. In addition, it reportedly enables smoother tapping with better chip evacuation. Moreover, it reduces tap inventory because the multifunctional tap can thread a large variety of materials, including carbon, alloy, stainless and tool steels, the company explained.

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Tapping technology

No need to ‘tap out’ when it comes time for threading holes

Troubleshooting