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Left Elevator - rivets don't fit

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swayze(at)europa.com
Guest

Posted: Thu Mar 29, 2007 2:10 am Post subject: Left Elevator - rivets don't fit

Hi Everybody,

I'm working on the left elevator for my RV-7A, and I ran into a 

frustrating problem with some of the blind rivets required. There are 

4 blind rivets on the top and 4 on the bottom of the skin, that hold 

the skin to the outboard end of the E-606PP Trim Spar. This is the 

aft spar on the elevator that carries the trim tab, and these are the 

rivets forward and to the left of the little tabs that you bend over 

on the skin surfaces. The rivets called for are MK-319-BS blind 

rivets. They have brass-colored shafts. I tried every one of the 

rivets included with my empennage kit, and none of them will fit in a 

#40 dimpled hole. I tried a #30 hole in a piece of scrap, and it's 

way too big. Nothing about this is mentioned on the drawings or in 

the plans. All the other holes in this part are #40, and the standard 

AN326AD3-3.5 rivets fit just fine. Am I missing something? Did I get 

a bum batch of pop rivets? Or do I drill out the holes a little bit 

bigger?  If so, what size? I'm wondering if anyone else ran into this. Thanks.



Bruce Swayze

RV-7A Empennage

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Rick Galati

Joined: 10 Jan 2006
Posts: 91
Location: Lake St. Louis MO.

Posted: Thu Mar 29, 2007 3:55 am Post subject: Left Elevator - rivets don't fit

Bruce;

   

  Most pulled or blind rivets by their very nature are not as strong as solid rivets. To give them all the help they can get blind rivets should be inserted into a prepared holes that are very close to their diameter.

   

  You ran into a typical situation that is easily resolved by investing in a cheap digital micrometer and a drill index chart.  Enclosed is a copy of my favorite chart.   I find I refer to both tools often for one task or another.  If you measured the MK-319-BS, you would find it mics out at approximately .110-.111 in diameter.  The dimpling operation opened up the material just a bit.  Therefore, the correct drill bit to prepare a hole to accept a MK-319-BS is 7/64."  

   

http://img376.imageshack.us/img376/5454/img153pr3.jpg

   

  Rick Galati  RV-6A  "Darla!"

  RV-8 Fuselage

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Last edited by Rick Galati on Thu Mar 29, 2007 7:27 am; edited 2 times in total

vhimsl(at)adelphia.net
Guest

Posted: Thu Mar 29, 2007 6:34 am Post subject: Left Elevator - rivets don't fit

I use 7/64, #33 or #34 (mostly #34). Start out small and progress to larger.

Skin thickness, dimpling, etc. make a difference. The #40(many prefer a #41)

and #30 are for standard rivets. The blind 'Pop' rivets are thicker. 



You will find a drill bit gauge (flat plate with holes in it) for numbered

bits to be most useful. With the gauge you can put the pop rivet (screws,

pins, etc.) in each of the holes to find the right bit. Saves a lot of time!

It is even quicker than walking the extra five feet to my builders log to

search for the page where I wrote down the drill bit size the last time I

needed it.



Also get a chart that shows all the drill bits, both numbered and fractional

together so you understand relationship say between a 1/8th and a #30.



7/64" = .1094 

#35   = .1100

#34   = .1110

#33   = .1130

#32   = .1160

#31   = .1200

1/8"  = .1250

#30   = .1285

#29   = .1360

You might want to pick up drill bit #'s 11, 12, 19, 21, 27, 29, 'D', 33, 34,

35, 36, and 37. They're for bolts, screws, other...Can't remember all the

reasons, but I have them and they look well used.



When I first started, pop rivets were to be avoided at all cost. Now, pop

rivets are my friends. Lost track of dings caused trying to avoid using

them.



Regards,

Vince H.

RV8 - VSB finish

Moscow, ID



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truflite(at)yahoo.com
Guest

Posted: Thu Mar 29, 2007 6:53 am Post subject: Left Elevator - rivets don't fit

My guess is that you have the wrong rivet.  I just

looked at my elevator and found an aluminum rivet and

a steel pin.  The rivet I ended using there is a

MK319BS.



Dave



--- Bruce Swayze <swayze(at)europa.com> wrote:



 	  Quote: 	
		   

 <swayze(at)europa.com>

 

 Hi Everybody,

 I'm working on the left elevator for my RV-7A, and I

 ran into a 

 frustrating problem with some of the blind rivets

 required. There are 

 4 blind rivets on the top and 4 on the bottom of the

 skin, that hold 

 the skin to the outboard end of the E-606PP Trim

 Spar. This is the 

 aft spar on the elevator that carries the trim tab,

 and these are the 

 rivets forward and to the left of the little tabs

 that you bend over 

 on the skin surfaces. The rivets called for are

 MK-319-BS blind 

 rivets. They have brass-colored shafts. I tried

 every one of the 

 rivets included with my empennage kit, and none of

 them will fit in a 

 #40 dimpled hole. I tried a #30 hole in a piece of

 scrap, and it's 

 way too big. Nothing about this is mentioned on the

 drawings or in 

 the plans. All the other holes in this part are #40,

 and the standard 

 AN326AD3-3.5 rivets fit just fine. Am I missing

 something? Did I get 

 a bum batch of pop rivets? Or do I drill out the

 holes a little bit 

 bigger?  If so, what size? I'm wondering if anyone

 else ran into this. Thanks.

 

 Bruce Swayze

 RV-7A Empennage

 

 

 -- 

 

 

 



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matronics(at)cencula.com
Guest

Posted: Thu Mar 29, 2007 7:30 pm Post subject: Left Elevator - rivets don't fit

Here's a picture of the correct rivet to use.:



http://www.our7a.com/20061007.html



Others are correct, the holes need drilled out to 7/64.



Mike



On Thursday March 29 2007 06:10 am, Bruce Swayze wrote:

 	  Quote: 	
		   



 Hi Everybody,

 I'm working on the left elevator for my RV-7A, and I ran into a

 frustrating problem with some of the blind rivets required. There are

 4 blind rivets on the top and 4 on the bottom of the skin, that hold

 the skin to the outboard end of the E-606PP Trim Spar. This is the

 aft spar on the elevator that carries the trim tab, and these are the

 rivets forward and to the left of the little tabs that you bend over

 on the skin surfaces. The rivets called for are MK-319-BS blind

 rivets. They have brass-colored shafts. I tried every one of the

 rivets included with my empennage kit, and none of them will fit in a

 #40 dimpled hole. I tried a #30 hole in a piece of scrap, and it's

 way too big. Nothing about this is mentioned on the drawings or in

 the plans. All the other holes in this part are #40, and the standard

 AN326AD3-3.5 rivets fit just fine. Am I missing something? Did I get

 a bum batch of pop rivets? Or do I drill out the holes a little bit

 bigger?  If so, what size? I'm wondering if anyone else ran into this.

 Thanks.



 Bruce Swayze

 RV-7A Empennage

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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