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Tool
I agree with Capesam that a radius bit is the best. I use a 60 degree bit too. I like a much smaller radius on the point than Capesams. I find that if I use a big radius on the tip I get a little vibration, especially if I am doing a small dia. plug or a hard material like rock maple into a needle. I too use high speed steel, 1/2 square, but also use carbid ground the same way. I add an angle on the bit, if you look at the front view, that I think makes the tool cut much cleaner. The side view, like CS's, has the much needed angle also. I have never experienced any tearout but with a sharp point the finish looks like crap which is why you need the radius on the point. Maybe you are being too aggressive with the amout of stock you are trying to remove . Maybe your RPM's are too slow but you said you did it before. Try what Capesam's and I suggested and if still can't get good results send me the bit and I will grind for you. Paul
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