Set your speed down and use light oil to cool the bit you Shouldn't have any problems. When I do that I put a couple nuts on the bolts so I can clamp them in the vice with out damaging the threads. I have drilled grade 8 bolts as long as 5" for grease passages. PATIENCE is the key.


I know a lot about a lot of things BUT I still have a lot to learn.
Life is what you make of it. So, why not make a working machine to make it easier.