Notes on drilling stainless steel with DIY tools
I had to drill some mounting holes in a stainless steel tray I bought. It was harder than I thought. Here's what worked, in the end: Use cobalt bits. Home Depot sold some cobalt bits my Milwaukee called "Thunderbolt" that were expressly stated to work well on stainless and iron. They did the trick for me where gold titanium bits just dulled and broke. Use a slow drill speed. The second-slowest speed on my 18V cordless did well. I tried high speeds, and they just made the drill bit tip cherry-red, melted and useless. Use moderate pressure. Drill straight down. Drilling on an angle makes it more likely you'll bust the bit off. The above notwithstanding, I found a little bit of wiggle on the drill helped the bit gain some bite. YMMV. I wouldn't do this on thicker metals. Use a nail or something to dent the metal where you want to start. The "Thunderbolt" bits did a good job of staying put to start, as long as you went really sl...