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Rivet and holes sizes

 
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LIKE2LOOP(at)aol.com
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PostPosted: Sun Jan 29, 2006 8:16 am    Post subject: Rivet and holes sizes Reply with quote

In a message dated 1/28/06 11:53:10 P.M. Eastern Standard Time, ron.mcgann(at)baesystems.com writes:
Quote:
Section 29, page 14, step 9 has you countersink the fuse longerons for a AN426-AD3 rivet.  Is this correct, or are they countersunk for an 032" skin dimple?


     If you countersink for a  3- rivet, it will accept the rivet or 3/32 skin dimple that will then have the 3- rivet in it.  So to answer your question, the CSK will work for either a rivet or a skin dimple. 
 
  For the confused (like me),  The rivets are numbered in 32nds. 
 
The "3-"  rivets are 3/32nds.  (0.09375") and fit in #40 holes (0.098"). 
 
The "4-"  rivets are 4/32nds =  1/8" dia.  (0.125") fit in #30 holes (0.1285").
 
The #40 drills are smaller then the #30. 
 
    I also got hung up the issue of what size to drill some of the stiffeners on the surface that faces the skins HS.  The plans can be confusing at first.  They become obvious when you make mistakes. 
 
     The best way to figure out what they are really saying is to flip to the page with the skin diagram with the rivet call out specs for the section you are on.
 
    If the rivets called for are AN426 3- then the holes are all 3/32 (#40 drill), so NO surfaces that faces the skin should be drilled larger then 3/32, or a #40 drill, and they will be flush.  The AN470 are the dome shaped rivets, so no dimple or CSK.  The skin layout pages often clear up all the words on the previous pages.    
 
     If the rivets called for are  4- then the holes have to be 1/8 (#30). 
 
    It would really help if the plans were like the VS figures with specific rivets  and drill sizes on the drawings as well.  They seem to slack on detail as we go.
 
    If you think about the holes... any dimpled holes usually have a corresponding Countersunk hole behind it, if the metal is thick enough. If there is a doubler behind a countersunk hole, it needs NO cs or dimple since it butts up to a flat surface.  For the new guys.... ( i am a veteran, 1 month into it) the number on the rivets after the dash is just the length.   I hope this clears up things for some folks.
 
Steve       Just finished dimpling the HS skins and ribs, and doing all the CSK.  
Stephen Blank       RV-10   Builder #40499 / C-170B flyer
766 SE River Lane
Port St. Lucie, FL 34983

772-475-5556 cell


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ron.mcgann(at)baesystems.
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PostPosted: Sun Jan 29, 2006 2:14 pm    Post subject: Rivet and holes sizes Reply with quote

Hi Steve, 
 

 --------  If you countersink for a  3- rivet, it will accept the rivet or 3/32 skin dimple that will then have the 3- rivet in it.  So to answer your question, the CSK will work for either a rivet or a skin dimple.  --------
 
You may in fact find that the countersink for a -3 rivet is too small for an 032 skin dimple.  If you countersink to flush the head of a -3 rivet, then insert a dimpled skin into that countersink, you may notice the skin sits a little proud (ie above) the flange with the countersink.  The objective is to have the dimple sit in the countersink AND to have the skin flush with the underlying structure.  
 
I have found that countersink depth varies with skin thickness.  Just my observation - other's experience/opinions may vary.
 
cheers,
Ron    
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