How To Drill Hard Steel Video
Drilling steel or metal is harder than drilling wood. If you don't know how to drill steel, you can dull your drill bits quickly. Be sure to use a drill bit designed for steel, such as a cobalt bit. Wood drill bits have a special point that were not work with metal.
Use a little oil on the steel to lubricate and cool the drill bit. Heat will dull the drill bit rapidly. Drilling in steel requires a slower drill speed. Too fast and more heat is generated.
Place a block of wood under the steel workpiece. This will allow the drill bit to go into the wood, instead of dulling the bit on a piece of concrete.
As long as you have the proper sharp bit, a little oil and a variable speed drill, you can drill through steel or sheet metal without damaging the drill bit.
I received the following tip from John Gibbs of Ontario, Canada. Based on his years of experience as a tool and die maker, John provides this excellent tip.
"Hi, I am a retired 71 year old tool and die maker ... worked at my trade for 53 years.
I recently saw the video on how to drill through steel. It was very good. But if you needed to enlarge that hole, then the larger drill bit will often vibrate and produce a chatter which gives a terrible 5 or 6 sided edge instead of a smooth accurate edge to the hole.
The solution is to simply use a piece of emery cloth. Fold about a 1 X 2 inch piece of emery cloth in half, with the smooth side on the OUTSIDE, to avoid scratching the work piece. Place it over the hole to be enlarged, place the drill bit on the emery cloth over the hole and begin drilling. It will automatically center itself. The emery cloth will let the drill bit through smooth and easy, and produces a beautiful smooth edge without a trace of chatter.
Works every time. This is a tip I learned as an apprentice in England. I hope that you find this interesting. It's one of the best tips I was ever taught. Would make a nice little 2 minute video probably."