Simcoe26, look back at my previous post about drilling speed. Small bits require higher speeds. As your bit size increases, slow your speed. You could start your 1/8" pilot hole at 2000rpm, just use plenty of oil. Once you start with the step bit, slow it down. You should be at about 600rpm to start and then down to 300rpm by the time you hit 1/2". Use that to the end. If you have work hardened your work piece (BK) you can either anneal the metal or start over in a new location. If you have not done any damage, the new location is a better (and easier) option. Also, make sure you punch the location. If you don't put a dimple in the metal, your bit will just wander and you'll never get anywhere, especially with all of that cutting oil on the surface.