Mapster
Member
I have some heat treated steel parts from work that I am planning on making a pen out of, but the parts just laughed at a fresh HSS bit. Cobalt? Carbide? Carbide boring bar? All tips and help would be appreciated!
Thanks for the tips everyone. I actually have a sleeve type part and I have to open up the inner diameter about 10 thousandths. I need the ID to be .334 and it is currently about .320. It is case hardened, but I have to drill through the casing the whole way. I am drilling about half an inch deep.