This is a milestone for me: It's the 250th column since the start of the Professor Hammer series in 1995! One of the things I really enjoy is the follow-up I receive from readers, who often have some ...

I've drilled thousands of holes in stainless steel, and I've found it's best to use a very slow speed. Once stainless gets too hot, it instantly hardens, and the game is over after that. A ...