Quote:
Originally Posted by mholbrook38
Titanium drill bit. BE CAREFUL, Titanium will drill through almost anything.
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My suggestion would be to source a preimium carbide drill bit for the job. Carbide will drill through almost anything. Titanium is a hard coating for high speed steel for improved wear resistance, but no where as hard as carbide or as suitable for drilling hardened steel. You do NOT need extremely high spindle speeds for a carbide drill to work. Normal drill speeds will suffice.
Take your time and start with a smaller carbide drill bit prior to using the largest drill size without drilling into the crankshaft, Center punching is critical, as this will dictate the final size drill you can safely use. If you are going to error, do so towards the pulley and not the crankshaft. Grady gives excellent advice on using heavy grease to catch metal chips.
As a point of reference for my recommendation; carbide will cut high speed steel. Ask any machinist who has broken a high speed steel drill bit off in a hole. EDM, or a carbide drill are your choices for removing a broken high speed steel drill bit.