At the Mid-West SRP get together, there was a discussion on cryogenic freezing of metal during the heat treatment. I was reminded of this guy who uses dry ice in his manufacturing of knives. I asked Mike Blue if he knew of this guy and his machine and I couldn't remember his name. So here is the guy and his 290 lb double honing machine.
The Iceman's Double Hollowgrinder for Making Custom Handmade Knives.