[ssashton]

I ordered some single flute 1/8" down cutting end mills. I've ordered such things before and they usually have a single flute that is the cutting edge, say 17mm long.

These ones are different. They have a main flute that goes most of the 17mm, but it is not the primary cutting edge and does not go 100% to the end. There is a secondary shorter flute at the cutting end.

Is this some re-grind method or is it specific for plastics or something? Anybody seen this before?



It's easier to see in a video: https://photos.app.goo.gl/hKjsNkYcNdhxJQL3A