Originally Posted by pickles
You got to be very careful, if you generate to much heat at the drilling spot you'll "work harden" the area and you'll never get that drill through there. Like others have said, it's slow slow, lots of pressure and oil. There's no real substitute for cutting oil, but other oils will do in a pinch. A pilot hole is also a good idea.
Yeah, I did this recently trying to put a 1/2" hole in the keg. Said "screw it" and drilled at full speed, no coolant. Drill bit got halfway through and stopped going. I put some water on the hole and forced the drill through, (took a lot of effort), got my hole, but now the drill bit is hosed, (tip is discolored from the heat, it's so dull I had a tough time drilling copper with it last night).
Slow, with pressure, as I'd done it in the past, and even with just a trickle of water from a garden hose works great. Don't be impatient and try to rush it like me.