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First of all this is definately not the be-all-to-end-all deburring guide.  But included is how I do it, and some tips as to what order to use the tools.  I am still (after finishing tail) not happy with my process for deburring ribs, as it takes WAY too much time. 
Deburring is the process of removing burrs from the metal part.  Burrs are commonly formed when drilling, punching, or cutting metal.  These are small sharp burrs of metal that are left on the edge.  It is important to remove the burrs on holes because they can keep the rivets from sitting flush.  They can also be a point where stresses conentrate and start cracks.
Deburring holes:
To deburr holes, you simply spin a deburring tool one time in the hole.  Spinning it more just starts countersinking the hole.  This is bad for thin skins as it makes the joint weaker.
Deburring Skins:
The skins come with ridges from the edge of the punches that cut the skins and a burr all along the bottom side of the skin.  If you start by using an edge deburing tool first, as it hits the ridges it will not clean the edge burr evenly, so first use a file to remove all of the ridges (every 4 in or so from the punches), then use the edge deburring tool to remove the burr.
I usually use a 2" polishing wheel after the edge deburring tool to finish the edge up.
Deburring ribs:
Start with the bench grinder polishing wheel.  This will get almost all the burrs off.  The only point that this will not get is inside the bent flanges on curved ribs.  On these small spaces I am using very small files, and sandpaper.  Not happy with how long this takes, and still looking for a better process.