While searching for some carbide bits for milling aluminum, I ran across this online feeds and speeds calculator. This calculator was found at www.micro100.com , the super carbide tool store. Sorry if this has been posted already, I did a quick search on OB and it did not come up.
Josh
BTW, I'm not affiliated with Micro 100 in any way, I was just looking for some carbide end mills.
Feeds and speeds calculator - an online resource 2015-08-20
Free online feed and speed calculator