Proper way to drill through metal?
I need to drill very many small holes (1/4 inch wide) through the metal of a shipping container the kind that are loaded on ships and on the back of trucks. The wall thickness is aprox. 3/16th of an inch thick. Problem: I am going through drill bits at a very high rate. I am getting only 12 holes drilled before the drill bit is worn out and I have to keep replacing with new bits. Am I doing something wrong ? Please tell me if there is some way to extend the life of the bit. Using WD-40 ? Some other oil ?
Also, I forgot to ask if using a drill bit for metal is harmed if I also use it for drilling through wood ? In this case pine.
Richard Whiting さんによる