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  #1  
Old 05-31-2020, 08:41 AM
RV701775 RV701775 is offline
 
Join Date: Jul 2019
Location: Boston, MA
Posts: 95
Default Skin Deburring Question

On skins and other punched parts where there are curves or bends in the punched area there are significant burrs on each side of the curve that I am finding difficult to debur without taking off quite a bit of material from areas around the curve. If I use a flat needle file it leaves a notch that could create a stress concentration, so I have been using a curved needle file but it is necessary to increase the radius to maintain a well curved surface. This creates a slight hump. I wanted to get some feedback and possibly some photos or examples of how other handle these areas.

Here are my photos:

https://eaabuilderslog.org/?blprojec...=7YL1dRvO9&add
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  #2  
Old 05-31-2020, 09:09 AM
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jcarne jcarne is offline
 
Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 1,977
Default

I used little scotchbrite wheels from Cleaveland on a Dremel to get things like that. If it was really tight I used 400 grit turners cloth and flossed it.
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  #3  
Old 05-31-2020, 09:38 AM
Marc Bourget Marc Bourget is offline
 
Join Date: Apr 2009
Location: Stockton, California
Posts: 338
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Have you tried a drill slightly larger than the hole, and roll it between two fingers as you rock it back and forth?

Sharp drill won't require much pressure. A finger from the other hand near the tip helps direct the deburring.
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  #4  
Old 05-31-2020, 05:36 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,755
Default Corner deburring

Don't overthink it. Wrap a piece of maroon scotchbrite around a piece of PVC pipe and roll it in the corner.
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Donated 01/01/2021, plus a little extra.
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Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #5  
Old 05-31-2020, 06:03 PM
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fl-mike fl-mike is offline
 
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Files, needle files, drill bits, deburring tool, abrasive cloth, 400 grit aluminum oxide sandpaper, scothbrite wheels, a bit of scotchbrite cloth on an arbor. Whatever it takes. Trust me, you'll have a drawer full of options soon...
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RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
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  #6  
Old 05-31-2020, 06:07 PM
mturnerb mturnerb is offline
 
Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 1,605
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Quote:
Originally Posted by fl-mike View Post
Files, needle files, drill bits, deburring tool, abrasive cloth, 400 grit aluminum oxide sandpaper, scothbrite wheels, a bit of scotchbrite cloth on an arbor. Whatever it takes. Trust me, you'll have a drawer full of options soon...
I'll add a couple to this list: emery cloth (may be the same as abrasive cloth and if so, I'm being redundant), and these little goodies: https://www.amazon.com/Mitchell-Abra...0966346&sr=8-4. (comes in various sizes).

Also - sandpaper rolled up into little cigarette-sized rolls, and adhesive sandpaper (https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1) on a popsicle stick....
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Last edited by mturnerb : 05-31-2020 at 06:42 PM.
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  #7  
Old 05-31-2020, 11:48 PM
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JonJay JonJay is offline
 
Join Date: Jan 2007
Location: Battleground
Posts: 4,348
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Hand deburring tool is another option. They work great on larger radius holes and inside corners. I prefer it over using an abrasive for short run work in these areas. The end result can be just as smooth as polishing once you learn the right pressure and angle and how to steady the tool.
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Last edited by JonJay : 05-31-2020 at 11:55 PM.
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  #8  
Old 06-01-2020, 07:54 PM
Aero_Octaveus Aero_Octaveus is offline
 
Join Date: Aug 2014
Location: Edmonton, AB
Posts: 240
Default

1" squares cut out of maroon scotchbrite, then attached to the end of a dremel does an incredible job of smoothing out those nooks and crannies after you use a small file to break the edges.

Amazon is also a gold mine when it comes to small sanding drums for the dremel as well.
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  #9  
Old 06-01-2020, 10:57 PM
DTARM1 DTARM1 is offline
 
Join Date: Feb 2016
Location: Planet Earth (and it's lonely here)
Posts: 53
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You don't need a machine. I don't know why so many people need to have some kind of machine to do something. Hold a piece of sandpaper or scotchbrite in your hand and using your finger rub the piece of sandpaper or scotchbrite across the area to deburr. You don't need a $3,000 scroll air compressor and a $1,500 Desouter angle grinder with a $15 3M rol loc and a $4 rol loc disc to do what a piece of scrap sandpaper you pull out of the trash can will do. But, then again, maybe you do.
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  #10  
Old 06-02-2020, 06:53 PM
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bk1bennett bk1bennett is offline
 
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Location: Sachse, TX
Posts: 81
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Quote:
Originally Posted by fl-mike View Post
Files, needle files, drill bits, deburring tool, abrasive cloth, 400 grit aluminum oxide sandpaper, scothbrite wheels, a bit of scotchbrite cloth on an arbor. Whatever it takes. Trust me, you'll have a drawer full of options soon...
He speaks truth
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