Something else that might help is.if you're using thick Ti (more then. If you use cutting taps, use a spiral point tap. (for 2-56 threads) Third is the type of tap (as you mentioned).for thread forming taps I use a #48 or 5/64" bit. In some cases I've even gone as large as 5/64" on thicker Ti. I've come to take the information the drill/tap charts give, and go 2-3 sizes larger.
My "secret" is three fold.first and most important for me is the tapping head.I have one from Enco that is mounted to a dedicated Ryobi 10" drill press. I need recommendations so I can get something ordered right away. It is also being done by hand.not under machine power. This is being done in a mill or drill press with dialed in tables.so the tap is straight. I broke the last $35 2-56 tap I had last night on the second hole of. Jude knives for auction, and they have to be done by 8/1. As usual, I'm stuck because I am right in the middle of making St. I posted this on Facebook last night and David Curtiss said he uses forming taps, not cutting taps. I will step up to something like a #50 or even a #49, and I still get a really tight binding. I try to stay away from the cheap Chinese junk.Ī look at the tap chart says a 2-56 tap needs a #51 drill, which measures. It feels like I'm tapping a hole that is drilled under the tap drill size called for, but in reality I drill it bigger just to avoid this symptom. Even though I'm using a brand new tap, and a few different kinds of cutting oil, I still get unreal friction. Something about Ti that I can't really 's like it shrinks around the tap or something. I usually cannot get but two or three very small holes before the tap breaks. However, Ti seems to break my taps with ridiculous frequency. In other words, I am not an inexperienced person.
As a tool maker, I have tapped literally thousands of holes in all types of material. What I've come here to settle today is how I should be tapping it. I don't seem t have any problem cutting it in a mill with end mills though. I have trouble drilling, sawing, and tapping it. I love Ti as a material for my knives but the stuff is very hard to work with.
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