This is probably common knowledge among the seasoned CNC veterans but I just stumbled onto it. I bought this bit (Whiteside #1580 - 3/8 radius) several years ago for a special project I was doing on my milling machine and it has set in its pouch ever since. Yesterday I needed to radius the top edges of an odd shaped pocket that had a couple areas where I couldn't use a conventional hand held router and a round over bearing bit. I pulled this guy out and did a .040 internal offset of the pocket in Aspire and ran a Quick Engrave toolpath .350 deep. It worked slicker than stewed oysters. I can see using this bit a lot and ordered the other two sizes that Whiteside makes, the #1570, 3/16" radius and the #1572, 1/4" radius. I just wish there were more sizes availble.
http://www.amazon.com/s/ref=nb_sb_no...Round+Over+Bit
http://www.amazon.com/gp/product/B00..._detailpages00
http://www.amazon.com/Whiteside-Rout...Round+Over+Bit