Anyways, to answer you seriously, you need an ultra high speed spindle to spin a small engraving tool at a decent speed to make some kind of a chip, instead of just mushing over a burr.
You actual feedrate would not be all that high, based on my experience (which is not all that much with engraving on a mill), I doubt that you would need much more than 10 inches per minute feedrate.
Bigger cutters can stand more feed pressure, so you need to determine what the largest cutter is that you will use, and even then, how much production per hour do you need to push past it?
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