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  #1  
Old 08-13-2019, 07:58 AM
Roy25101 Roy25101 is offline
 
Join Date: Mar 2014
Location: Orlando, FL
Posts: 54
Default AST hinges quite tight...

I just finished installing the AST hinges. When installing them there is no gap between the left and right tabs which I assume is ok because they move in unison. The hinges themselves are both pressed to one side but not too badly. They move quite easily but there is a noticeable squeak. I was wondering if anyone experienced this issue. Perhaps a solution would be to file the binding sides of the hinge eyes slightly to decrease the tension.. Thanks for any thoughts...
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  #2  
Old 08-13-2019, 10:15 PM
Vakashi Vakashi is offline
 
Join Date: Feb 2018
Location: Auckland, New Zealand
Posts: 11
Default

When you riveted the horns to the AST ribs the shop head of the rivet is against very thin material necessarily, which causes the ribs to bulge outwards by about 0.25 mm. When you place the two ASTs together they are 0.5 mm further apart from one another than they should be and there is your problem. I took mine apart and put ever so slight an inwards dimple in the rib before riveting to counteract the puckering effect of the shop head on thin material and hey presto a perfect fit. Also make sure that your countersinking of the rivets is absolutely perfectly flush, because if it is not the manufactured rivet heads will push the two parts of the AST apart as well.
Note that this is the way I did mine and must not be construed as advice on how anyone else should do theirs.
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  #3  
Old 08-14-2019, 12:15 PM
Roy25101 Roy25101 is offline
 
Join Date: Mar 2014
Location: Orlando, FL
Posts: 54
Default

Quote:
Originally Posted by Vakashi View Post
When you riveted the horns to the AST ribs the shop head of the rivet is against very thin material necessarily, which causes the ribs to bulge outwards by about 0.25 mm. When you place the two ASTs together they are 0.5 mm further apart from one another than they should be and there is your problem. I took mine apart and put ever so slight an inwards dimple in the rib before riveting to counteract the puckering effect of the shop head on thin material and hey presto a perfect fit. Also make sure that your countersinking of the rivets is absolutely perfectly flush, because if it is not the manufactured rivet heads will push the two parts of the AST apart as well.
Note that this is the way I did mine and must not be construed as advice on how anyone else should do theirs.
Thanks for taking the time to share that... It makes sense..
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  #4  
Old 08-14-2019, 01:01 PM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 589
Default

Roy,

The fit will become even tighter if your painter puts a thick layer of paint on each of the horns where they meet. I had mine painted but told the painter to go easy where the two horns mate. Even with thin paint, the fit got much tighter after paint than before.

Happy building.
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www.dogaviation.com
RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!

Dues paid until September 2020
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  #5  
Old 08-14-2019, 09:23 PM
DaveWelch DaveWelch is offline
 
Join Date: Mar 2005
Location: Huntsville, AL
Posts: 351
Default Bit of lube

Quote:
Originally Posted by Roy25101 View Post
I just finished installing the AST hinges. When installing them there is no gap between the left and right tabs which I assume is ok because they move in unison. The hinges themselves are both pressed to one side but not too badly. They move quite easily but there is a noticeable squeak. I was wondering if anyone experienced this issue. Perhaps a solution would be to file the binding sides of the hinge eyes slightly to decrease the tension.. Thanks for any thoughts...
As long as they move easily, just apply a bit of light oil or Boelube into the hinges. They’ll “wear in” and stop squeaking soon enough.
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RV12 N951DZ
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No paint yet. Working on a scheme with John Deere colors or accents.
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