Sterling Dump

[tc1cat]

With the speeds and feeds you are trying to run, you really need some form of coolant/lubricant on the endmill and part. 10K rpm on any type of end mill in metal needs to be cooled. If the aluminum doesn't heat up and grab the tool, the endmill will fill up with metal and then break. Must cool the metal and endmill and try to remove the metal chips from the tool and tool path. Coolant does make a mess but it is the only way to do high speed machining. You should actually flood the end mill with coolant for these speeds and feeds.

Lynn