12/11/2023 0 Comments Form taps mild steel![]() We lost the tap in job setup, when the lathe changed tools the tap hit the end of the workpiece and broke. We used to keep a running score of the number of holes we'd get for a certain tap, 5200 holes was the highest in 10-32, 7/8" deep in 12L14. Nothing to prove that theory, but then all taps perform better that way. The formed material assumes the shape of the thread form of the tap without the creation. I have a theory roll taps work best in machines with fixed feed, as in rigid tapping on CNC's or lead screw tappers. Forming taps create thread by displacement of material within the hole. The grooved relief type were a problem in all materials with deep holes, even though it's a chip-less operation you still get a mush of swarf flakes to clog the groove. In steel the coating or missing coating could give an indication of tap wear which we started to have after a couple thousand holes in steel. I bought both coated ones and uncoated, as a rule I would have used uncoated for aluminum only because I usually used everything uncoated for aluminum. Taps are made of high-strength steel (HSS) coated with titanium nitride (TiN) to provide a core with enough toughness but harder surface. Back in the day I don't recall seeing any roll taps being listed as material specific (there might be now though). I know there are different types, like the tri lobes, with grooves etc, but are they all material specific, or was I fed a line of bull?I believe you were fed a line of crap. is so high it does not dissolve in the steel anymore but is in free form. I never really questioned that, because we do 95% aluminum anyway, but now I'm curious. For cutting metric male thread by hand tapping, high carbon steel (HSS) is. ![]() ![]() What makes a roll tap suitable for use in steel or other material vs softer materials like aluminum? The ones that we have at work, I was specifically told by our tooling vendor that they were for aluminum and soft materials only, and don't use them on steel. ![]()
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