"Cheater corners"

http://www.rockler.com/product.cfm?p...BDB&filter=mdf
http://www.rockler.com/product.cfm?O...GG DADADADBDB
Chad Schmitz wrote:

I'm working on a project that uses two boards that are joined at a 45
degree angle and would like the corner created to be rounded. (I'm
interested to know how to do this for any angle other than 90 degrees)
Other than using sandpaper, is there a precise way to use any type of
router bit for this. I have over 100 router bits and none of them will
achieve this for me. Most bearing guided bits are geared for a 90
degree edge prior to routing. The graphic below shows the before
(left) and after (right) of what I'm trying to solve. I've been
woodworking for over 10 years and have made countless items, but
haven't been stumped like this before.

Any help?

http://schmitz.gotdns.com/wood/radiusfillet2.jpg