Drilling by friction with no loss of metal from the hole. The heat sort of creates its own rolled washer on the top of the hole (if you want one, or it doesn't if you don't), and it creates its own insert. No swarf results from the drilling and no cooling fluid is needed. What do you think? [ame="https://www.youtube.com/watch?v=o7MV0i1QTzo"]Formdrill: Create your own inserts (Flow drilling) - YouTube[/ame]
Really cool, but that takes pretty heavy duty industrial machines to use it - for example a 1/4" size hole requires 1.6hp @2800 RPM. Plus they're Morse taper toolholders, you can't chuck one of those into your home drill press. While my little home drill press will hit 3,000 rpm, at 1/3 hp no way I can get the power needed to keep that speed when you start to press the hole. Still, I'd love to have a 1/4" bit just to try on sheet metal - wonder what they cost?
They have a wizard to help you determine what items are required. Formdrill: Tool selection wizard As an example. For 1/4 NPT thread in 0.120 Stainless with a collar you would need these bits. Your Formdrill application
And you need a Morse taper machine with significant HP to drive it..... Those drive collars are spendy.....