We’ve been milling parts with a 1/8" cutter, 2-flute, in both aluminum and plastic and had this happen to the 1/8" collet we were using with a Velox Quick Change system.
The bore appears to have softened and hollowed out slightly, “flowering” at the tip and into the edges of the collet, resulting in not being able to successfully grip tools.
Example feeds & speeds include 23kRPM, 30ipm, 0.80" DOC, 2 flutes in Aluminum.
Has anyone else seen failures like this? This is completely new to me.