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Deburr using drill and 400 grit sandpaper?

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Joined
Sep 14, 2020
Messages
6
I am just getting started, and I have some sheet metal of a CH 750 rudder kit that I was preparing. I found that many (if not almost all) holes in the sheet metal had burrs, so I gently used a large drill bit to get rid of the worst of it, and then used 400 grit sandpaper to level the remainder. This process seems to keep me safe from countersinking, but causes some pretty ugly scuffing/scratching on the sheet metal. I guess I would see the same results if I used a smooth file.

First, am I causing any damage to the skin by doing this? I think not, as I have seen others use files. But worth asking.

Second, any thoughts or suggestions on what to do about the scuffing/scratches? Can I buff out the scuffing/scratching before riveting? If so how?

Any advice would be most appreciated. Rather try to understand now before I make mistakes down the line that would be more expensive. Thanks.
 

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