8 Ways You re Killing Your End Mill In The Loupe· Few things ruin a machinist s day easier than broken chipped or prematurely worn down end mill Here are 8 variables that impact tool life 8 Ways You re Killing Your End Mill February 7 2018 / 4 Comments / in CNC Machining Machining 101 Milling Quick Tips Trending Now Troubleshooting Tips / by Harvey Performance Company Running It Too Fast or Too Slow Can