Depends on the cutter dia ..My milling machine is made from an old heavy cast iron bench drill...and I don't have any problems milling wood at top speed... Most routers run at 25,000 up to 30,000 rpm with cutter bits. Up to 12mm...I'd imagine that a router fastened to the drill somehow would be better tho'.You had to go open it up huh? See how it works?
I did that with several old watches, couldn't ever get them going again...
So a question about milling machines, and wood. I use my drill press as a milling machine for wood, and 3200 is the max rpm. What does a professional do?