replying to 123, dustinthesmith wrote:
Hate to say it, but you don't know what the hell you are talking about Pavel.
I'm a blacksmith of six years, every now and then even with the VERY high
quality steel I buy for knives you occasionally run into a slag inclusion which
simply cannot be drilled through. Basically, extremely hard carbides congregate
at a specific point and makes it almost impossible for even a carbide drill bit
to cut through it. It is simply the nature of steel and happens to just about
anything made with the bessimer process to some degree.
I myself have a harbor freight drill press and it works pretty great even for
drilling through hardened steel with a carbide bit. You can't exactly expect it
to mill stuff, but for its purpose it works well and does a better job than any
of my hand drills, including some very high quality ones I have.
All that being said, OP you could either find a way to grind through it, or
scrap it and start over.
Don't be too disappointed though, I've had to scrap some very expensive work
simply because of a slag inclusion on even American made steel of high quality,
and unless you are buying some kind of crazy Swedish powder metallurgy steel at
a huge mark up you will ALWAYS have a bit of a chance to run into some slag, it
has nothing to do with harbor freight or home depot. The guy isn't building a
skyscraper after all, there is no reason to sink hundreds and hundreds of
dollars into a simple home project.