100k subs! Who'da thought?! Building an insert tool for my flycutter gets me into milling, finishing and hardening D3 tool steel, including a spark test, with a chat about hardness, rigidity, stress, and strain. All over the place. Be sure to check out: ABOM79 https://www.youtube.com/user/Abom79 OxToolCo https://www.youtube.com/user/oxtoolco OutsideScrewball https://www.youtube.com/user/outsidescrewball Basement Shop Guy https://www.youtube.com/user/BasementShopGuy NYCCNC https://www.youtube.com/user/saunixcomp Stefan Gotteswinter https://www.youtube.com/user/syyl Laura Kampf https://www.youtube.com/channel/UCRix1GJvSBNDpEFY561eSzw Happy Boy Theme by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100647 Artist: http://incompetech.com/