The forming action creates heat and can work harden the material being formed. Speed Roll form taps should be run at 1-1/2 to 2 times the speed of a cut thread tap for a given material. For thicker Ti, I use a taper tap, which gives a more-gradual bite, and does a great smooth job. Just as important, rolled threads are stronger than cut threads because the metal grains are deformed along the thread contours. I always use a decent tapping fluid, a tapping jig, and a plug tap. This is where we publish technical articles, applications stories, tip and tricks, new product announcements and press releases. I always use cutting taps, and tap-hole sizes from the chart, and rarely break a tap. See below for tap/drill size formulas, and formulas to determine maximum and minimum drill hole sizes for appropriate percent of thread.įorm taps operate most efficiently at spindle speeds 1-1/2 to 2 times faster than those recommended for conventional cutting taps, especially in softer materials and/or with fine pitch forming taps. Allen Benjamin will not guarantee the performance of taps with the shorter chamfer.Įntry diameter, measured at the thread crest nearest the front of the tap, is an appropriate amount smaller than the diameter of the hole drilled for tapping. Hole Size for Inch Forming Taps Major Diameter, TPI (threads/inch), of Thread HOLE SIZE. When a controlled maximum chamfer shorter than 2 threads is required, an additional charge will apply. Suggested Percentage of Full Thread in Tapped Holes 3. The chamfer on BOTTOM style form taps is approxi mately 2 threads long and requires a drilled hole depth 3-4 pitches beyond the full thread required. Whenever entry taper length is specified in terms of number of threads, this length is measured in number of pitches (p).īOTTOMING LENGTH = 1-1/2 to 2-1/2 PITCHES Entry taper length is measured on the full diameter of the thread forming lobes and is the axial distance from the entry diameter position to the theoretical intersec tion of tap major diameter and entry taper angle.
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