A definition for deep-hole tapping that will preclude problems when tapping within this smaller size range should also be sufficient for larger sizes, which can cope better with tapping forces.ĭata from the field has shown us where the depth of the hole begins to be a factor in tool failures. Coarse pitches make the operation even more difficult, because the thicker chips created by the coarse pitch increase the torque of the operation. The small taps’ core diameters may not be enough to resist the higher torque of a deep-hole tapping operation. Observation and experience indicate that taps with diameters of 1/2" or smaller, especially those with coarse pitches, are more likely than larger taps to break or experience other problems in deep holes, such as abrasive wear, dulling, heat, and chipping. But it is possible to establish a working definition.įor such a definition to be useful, it should be applicable even to operations using the most delicate taps. The many variables that must be considered when tapping make it impossible to give an absolute answer. But the machinist must know exactly under what conditions the tap will be cutting and carefully choose a tool specifically designed for those conditions.īefore we look for the proper deep-hole tapping tool, we must first consider the question: “How deep is deep?” If machinists are to avoid or alleviate the problems associated with deep-hole tapping, they must have some guide to tell them when the depth of the hole to be tapped calls for greater care and concern. Broken tools, premature tap wear, and damaged workpieces are constant threats.ĭespite these difficulties, it is possible to tap deep holes successfully. It can be done, but it takes specific tools and special measures.ĭeep-hole tapping may be the most problem-prone of all machining operations.
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