Is this deburring OK?

aarvig · #1 04-27-2010, 12:42 PM

I am a newbie learning as I go so I thought I would post a pic of my recent hole deburring. I deburred the horizontal stab spars and double plates as well as all the ribs. I used a single flute, spun by hand with mild pressure (on a scale of 1 to 10 with 1 being no pressure and 10 be everything I have I was at about a 3). Is this good or do I need to change anything or is this too deep and should I start over? Thanks for the help.

msturgis · #2 04-27-2010, 01:04 PM

That looks good.. Basicly, you just want knock any rough edges, or burs off. If you can run your finger across the holes and not feel and roughness, you should be fine.

RV7Ron · #3 04-27-2010, 01:05 PM

plenty good...just need enough pressure to remove any burrs/sharp edges, doesnt take much at all.

RV7Ron · #4 04-27-2010, 03:32 PM

Quote:

Originally Posted by Rivethead

I'm going to disagree here (sorry). it appears to me your being a bit aggressive with the debur to the point of slightly counter sinking the holes. All that's necessary is slight pressure on the tool and once or twice around just to break the sharp edge and remove any chips that can propagate cracks. When done your holes should still have a fairly crisp edge.

good point...I dont disagree. I dont know if you can do any harm by going that deep, but its not needed. After you do several hundred, the pressure magically seems to lighten up too.

aarvig · #5 04-27-2010, 06:41 PM

Quote:

Originally Posted by Rivethead

I'm going to disagree here (sorry). it appears to me your being a bit aggressive with the debur to the point of slightly counter sinking the holes. All that's necessary is slight pressure on the tool and once or twice around just to break the sharp edge and remove any chips that can propagate cracks. When done your holes should still have a fairly crisp edge.

Yeah,
I kind of thought that may be the case which is why I asked the question. Do I need to replace the parts or are we OK?

tc1234c · #6 04-27-2010, 06:58 PM

Here is a quote from L. Reithmaier, "Standard Aircraft Handbook", sixth ed. Page 87.

"REmoval of these burrs, called debunking or burring, must be performed if the burrs tend to cause a separation between the parts being riveted. Burrs under either head of a rivet do not, in general, result in unacceptable riveting. .....", "Care must be taken to limit the amount of metal removed when burrs are removed. Removal of any appreciable amount of material from the edge of the rivet hole will result in a riveted joint of lowered strength."

Scott Hersha · #7 04-27-2010, 07:56 PM

Put your rivets in those holes and press on. Don't be so aggressive with your deburring in the future, but don't worry about it on what's been done. All of us have 'over-deburred' a few times. You have strength in numbers.... 18,000+ rivets. It's not coming apart.

mcencula · #8 04-27-2010, 09:01 PM

Certainly good enough to keep going.

The holes in the first picture look fine. That's a thick piece and can accept a heavier hand on the deburring bit. The holes in the middle picture look slightly over deburred. The bottom pic is a mix...the middle hole on the top row looks good, but the other ones look a little too much.

It's clear from the fact that you're asking the question that you're detail oriented. I'm sure your plane will be very nice once it's all done.

Good luck.

Doug Lewis · #9 04-28-2010, 02:45 PM

Aaron, I think you need more practice deburring. I'll give you a call when my wing kit shows up.

Brantel · #10 04-28-2010, 03:40 PM

Build on....Build on....save your money, those parts are fine.

Problem with opinions is that everyone has different standards. You will develop your own as your build moves forward. Just try every work session to do your best and stay within the range of acceptable limits and you will be golden.

Send them pics to Van's and they will tell you that your building an airplane not a watch and to build on.....

I tried to always stay on the conservative side of the Van's standard and that will almost always be good enough. If you have a concern, don't be afraid to keep posting them here as there is a ton of experience on this forum and these guys will call out something that is not safe.

Do you have an EAA tech counselor in your area? Other RV builders that are flying? They can help you with these concerns as they come up...