Currently, roll-form taps with both plug and bottom tapered threads are produced on precision thread-grinding machines capable of accurately maintaining a controlled taper point, lead, thread form, pitch diameter, and relief (Figure 2). Previously, it was difficult for the tooling on thread-grinding machines to generate the types of relief and configurations of lobes on the taps. Before improvements were made, extreme tapping torque was required, massive burrs were produced at the top of the hole, and excessively high heat was generated during roll-form tapping.
In the past, these advantages over cutting taps may have been overshadowed by problems with the original roll-form tap design. For these applications, the potential benefits of using roll-form taps over cutting taps include longer tap life lower cost per tapped hole no chip production, which eliminates the cost and time needed for chip disposal the ability to operate at increased speeds, which improves productivity reduced tap breakage and the production of threads with superior finish and strength (Figure 1). While conventional cutting taps may be preferred for short production runs and very thin-sheet stock parts, roll-form tapping technology may provide a great many benefits for shops involved in long production runs and deep-hole tapping applications. Outdated perceptions have made many machining firms wary of roll-form tapping.
Roll-form taps are gaining popularity for producing high-quality internal threads quickly and cost-efficiently.įigure 1.
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