As higher speeds are attained, adequate lubrication is essential for prolonged tap life and thread quality. TAPPING SPEEDS: TRU-FLO 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 TRU-FLO taps. See below for tap/ drill size formulas, and formulas to determine maximum and minimum drill hole sizes for appropriate percent of thread. Entry 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. We will not guarantee the performance of taps with the shorter chamfer. When a controlled maximum chamfer shorter than 2 threads is required, an additional charge will apply. BOTTOMING LENGTH = 1-1/2 to 2-1/2 PITCHES PLUG LENGTH = 3 to 5 PITCHES The chamfer on Tru-Flo BOTTOM taps is approximately 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). ENGINEERING DATA 109 TRU-FLO ® THREAD FORMING TAPS THREAD FORMING TAP ENTRY LENGTHS: 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 intersection of tap major diameter and entry taper angle.
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