Burrs are a by-product of Machining and therefor very difficult to eliminate. The only machining I have seen that produces little or no burrs is waterjet and EDM. Other than that rubbing 2 pieces of metal together to make one smaller will produce a burr no matter how sharp one of the parts are. I often run lite finishing passes to eliminate burrs and change the finishing tool often. I also use a vibratory deburring machine with the proper stones, being careful not to ruin the finish. You can also use a bead blaster to remove burrs so long as that type of finish is ok at the burr site.
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