Okay I know that this little Craftsman Lathe is to small but still. I have a 3/4 thick x 3-1/2 round disc. I put the disc in a 4 jaw chuck got it centered and turn it on.The disc is a36 steel All I had was one 1/4 inch tool steel I shaped it according to something I read. Any way all its doing is grinding the cutter. Not even scoring the disc. What am I doing wrong?