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Is this Okay?

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cs(at)charlesstringham.co
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Posted: Sat Mar 20, 2010 3:32 pm Post subject: Is this Okay?

I just finished the horizontal stabilizer a few minutes ago--at least, I hope I did. One of the last processes is to buck the AN470 rivets on the front spar--the ones that hold the center-most ribs (fore and aft) to the front spar itself and the two extruded aluminum angle fittings. The rivets look good. I located the manufactured heads directly over the extruded aluminum angle fittings. When I finished, I noticed the rivet set had not been absolutely straight, which resulted in smiles that encircle about 120 degrees of the extruded aluminum angle fittings around the rivets. The depth is perhaps 10/1,000 of an inch. I know how important the structural integrity of the extruded fittings are. The smiles have very smooth edges. Is this okay? Thanks, Chet

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carl.froehlich(at)verizon
Guest

Posted: Sat Mar 20, 2010 4:52 pm Post subject: Is this Okay?

These are easy to drill out and do over.  



Recommend putting a couple of layers of masking tape on the rivet set.  This

will prevent smiles.  Replace the tape every third rivet or so.



Carl Froehlich

RV-8A (525 hrs)

RV-10 (systems install)



--

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estone(at)mchsi.com
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Posted: Sun Mar 21, 2010 4:10 am Post subject: Is this Okay?

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N38CW

Joined: 16 Apr 2008
Posts: 57
Location: Winston-Salem, NC

Posted: Sun Mar 21, 2010 5:07 am Post subject: Re: Is this Okay?

Chet, without seeing a pic of your work, you are the only one that can make a determination on whether the smileys are OK or not.  But as was mentioned, tape helps reduce the chances of creating them.  Another option I have learned about is using Snap-Socs.  They work great, are color coded for different size rivets, and can be found at various places.  I got mine at Brown Tool.



http://www.browntool.com/Default.aspx?tabid=255&txtSearch=snap+socs&List=1&SortField=ProductName%2cProductNumber&ProductID=103



 	  cs(at)charlesstringham.co wrote: 	
		  I just finished the horizontal stabilizer a few minutes ago--at least, I hope I did. One of the last processes is to buck the AN470 rivets on the front spar--the ones that hold the center-most ribs (fore and aft) to the front spar itself and the two extruded aluminum angle fittings. The rivets look good. I located the manufactured heads directly over the extruded aluminum angle fittings. When I finished, I noticed the rivet set had not been absolutely straight, which resulted in smiles that encircle about 120 degrees of the extruded aluminum angle fittings around the rivets. The depth is perhaps 10/1,000 of an inch. I know how important the structural integrity of the extruded fittings are. The smiles have very smooth edges. Is this okay? Thanks, Chet

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_________________
Bill Settle
RV-8 Fuselage

cs(at)charlesstringham.co
Guest

Posted: Sun Mar 21, 2010 11:05 am Post subject: Is this Okay?

Thanks guys for your responses. I just wanted to make sure I explained that the smiles are in the aluminum of the angle brackets that hold the horiz stab to the fuse, and not on the rivet heads. Do I need to hollow grind these? Will this reduce the strength of these critical parts?  Thanks, Chet

---

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estone(at)mchsi.com
Guest

Posted: Sun Mar 21, 2010 4:45 pm Post subject: Is this Okay?

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