Carbide Drill Speeds and Feeds Calculating speeds and feed for thread mills from our friend Bob Warfield at CNC Cookbook
https://www.cnccookbook.com/easy-guide-to-threadmills-calculator-speeds-feeds-programming/
Calculating chamfer mills and router bits
https://www.cnccookbook.com/easy-guide-to-chamfer-mills-cutters-router-bits-feeds-speeds-and-more/