01-22-2024, 05:32 PM
(01-22-2024, 02:54 PM)EdK Wrote: That is bizarre. I wonder if it had a crack in it?
What brand of end mill was it?
Ed
Hard to say. It was one of a dozen or so random sizes of Enco end mills that I bought back when I bought my mill. They all sit in a drawer in one of my tool boxes reserved for machining tools only. Each end mill has it's own square plastic telescoping container as well so it's not like they are rolling around in the drawer banging into each other like my hand files do.
Still, they were made in China. If it wasn't cracked before hand my only guess is that the force put on the flutes of the end mill running in reverse is much higher than running in the correct direction. Maybe something to do with the angles / corners of how the flutes are ground? Just a wild guess from a not-even-close to an engineer.
I've never had any problem with any of the other Enco mills though - probably because I haven't tried running them backwards as well.
Willie