Originally Posted by glocked-up
So would it be correct to say that a mill press can do anything that a drill press can.....but a drill press can't do the things a mill press can do?
Generally, yes, that's true, but not completely. A nice drill press - and I'm talking about professional machine shop equipment here - will often have longer quill travel than a typical milling machine will, so you can use longer drills and still be able to retract them all the way out of the hole to clear your chips out. But that's not always true of all drill presses.
Mills have much stronger spindle bearings, so don't fall for a drill press with an X,Y table retrofitted onto it, and NEVER expect an end mill to cut worth a crap when you've got it mounted into a drill chuck. End Mills NEED to be held in collets. The loss of proper rigidity will keep it from cutting right, and will break the end mill, as well as ruin the concentricity of the drill chuck.
And: neither myself, or any other machinist or toolmaker I ever knew would refer to a "milling machine" as a "mill press".