Re: centering
Not sure about the 135-degree point drills. Always use c'drills except for the Titex drills in both the lathe and mill.
Tool above center might be due to rake of the tool. Are you using ground tooling or carbide insert tooling? I have some insert tooling that my Sherline lathe wouldn't cut air with. No idea why as they work great in other machines.
I see that pugs beat me to answering!
Lynn
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