what would be an optimal feed and speed and doc for 1.4301 stainless steel in a fanuc robodrill with 12mm (half inch) end mill?

is there a good online calculator which can "tell me" that?
I would like one which takes many things in consideration for example how much the tool is pulled out of adapter, or how long it is, the size of part (vibrations due to longer and slimmer parts), etc.

I was breaking tools in that material like crazy, but at first i used 6mm end mills.

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