Especially in steel thicker than ¼", twist drill bits will require extra pressure, lots of lubrication for cooling and some profanity — especially when trying to use a hand-held drill in an ...

That had 300 LEDs and came out great, but at the cost of manually drilling 300 holes in sheet steel with a hand drill. Looking to expand his wall of balls to four times the original size ...

For drilling holes in steel that’s 1/8 in ... Never hold a piece of metal in one hand while trying to drill through it with the other. The drill bit for metal could catch, instantly causing ...

It turns out that a hot solution of alum (ammonium aluminum sulfate), which is available in the spice rack of your local supermarket, will dissolve the steel drill bit without reacting with the brass.