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  #1  
Old 03-08-2008, 01:37 PM
tinman tinman is offline
 
Join Date: Aug 2005
Posts: 496
Default Gear Tower Cherry Max Rivets

I have given up on trying to buck solid rivets along the top of the gear towers. I went to Genuine Aircraft Hardware and found the 3214-4-4 Cherry Max rivets. They were offered in packs of 100...not so good for our needs since we need around 20 or so...
After explaining the need for smaller quantites for the RV-8 to them, they have agreed to offer the rivets in packs of 10. Go to the website here and you can locate them:
part # CR3214-4-4PKG/10
http://www.gen-aircraft-hardware.com...CR3214%2D4%2D4
If you order the PB REF BOOK (Cliff Notes for hardware) they will throw it in for free if you plug in the promotion code GEARBOX

Regards,
Don Alexander
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  #2  
Old 03-08-2008, 03:10 PM
RV505 RV505 is offline
 
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Hyloks would be a much better choice..

Last edited by RV505 : 03-08-2008 at 04:46 PM.
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  #3  
Old 03-08-2008, 05:19 PM
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Rick6a Rick6a is offline
 
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Quote:
Originally Posted by tinman View Post
I have given up on trying to buck solid rivets along the top of the gear towers..........
Don,

I recently installed Cherry rivets in that area. I used CR3212-4-4 and are available in units of one from Wicks and Spruce. See this thread for more info and a pic.
http://www.vansairforce.com/communit...022#post205022
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  #4  
Old 03-08-2008, 07:33 PM
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Walt Walt is offline
 
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Quote:
Originally Posted by RV505 View Post
Hyloks would be a much better choice..
Hyloks are great but are usually used in thicker materials than what we use in our RV's and require precision reamed holes. If the holes are not specifically reamed for Hyloks than rivets are probably better.
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EXP Aircraft Services LLC
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  #5  
Old 03-08-2008, 08:50 PM
RV505 RV505 is offline
 
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Quote:
Originally Posted by Walt View Post
Hyloks are great but are usually used in thicker materials than what we use in our RV's and require precision reamed holes. If the holes are not specifically reamed for Hyloks than rivets are probably better.
You are thinking of interference fit holes that are reamed to attach all aluminum l stuff like eng pylons vert stabs, primary structure. . You can install Hy-loks using Clearnce fit ( Rivit hole sizes ) The smallest Cherry is 1/8 or a #30 drill bit. The smallest Hi-lok starts at a 5/32 or # 20 dril so they arn't that much bigger. Plus the Hy-loks won't work like a cherry and looks really trick. Anyway Don if you want some Cherrys PM and I'll send you some. I have tons of them.

Last edited by RV505 : 03-08-2008 at 09:01 PM.
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  #6  
Old 03-09-2008, 06:49 AM
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Rick6a Rick6a is offline
 
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The problems I foresee trying to use hyloks in this application are threefold. First the skins are dimpled and can't take very much remachining, especially to accept 5/32" hyloks. Even if the dimples could be reworked, the flush hylok heads would stick out "like a sore thumb" compared to the rivets in the surrounding area. Also, you would have to bring up a series of holes to approx. .160 in the (very structural) longeron which is a consideraby larger dia. than the design call out for AD3 rivets through the longeron in that area. Finally, even if you could accomplish all that satisfactorily, I have to wonder this. If you can't access the very limited area inside the towers with a small bucking bar, trying to reach inside them with your fingers to thread the individual collars onto the hylok threads and follow that up with a wrench or ratchet setup to set them with would seem.......well, difficult.
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  #7  
Old 03-09-2008, 11:11 AM
RV505 RV505 is offline
 
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I didn't know the skin was already dimpled.. Suppose if you did accomplish the first to hurdels would hi lites work? They have a smaller collar?
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  #8  
Old 06-04-2009, 05:20 PM
SHIPCHIEF SHIPCHIEF is offline
 
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Thanks for that Don!
I went ahead and ordered the 100 pack because of the price break. They offered the Hardware manual like you said they would.
We have a lot of RV's being built @ EAA326 Puyallup WA, so I'm sure none of the extras will go to waste.
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RV-8 N89SE first flight 12/26/2013
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  #9  
Old 06-19-2009, 07:33 AM
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jmbrwn jmbrwn is offline
 
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Quote:
Originally Posted by Rick6a View Post
The problems I foresee trying to use hyloks in this application are threefold. First the skins are dimpled and can't take very much remachining, especially to accept 5/32" hyloks.
Rick-

I am working on this area now. I've got 2 of the rivets in the gear tower done with much frustration. I have the Cherry Max rivets, but the skin is already dimpled for 3/32 rivets per the plans. When you say remachining...what do you mean. Would you countersink the skin to accept the larger Cherry Max rivets?
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  #10  
Old 06-19-2009, 09:19 AM
SHIPCHIEF SHIPCHIEF is offline
 
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That's what I did.
The Fuse skin is pretty thick, so I drilled the holes out to #30, and reset my machine countersink to a very shallow cut. All of them came out perfect but one where I machine countersunk a tiny bit too much.
It wouldn't look horrible if you didn't machine countersink at all, but if you do, it looks just like a driven rivet with a dot in the center.
I think it will be invisible when you paint it.
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http://gallery.eaa326.org/v/members/semery/
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
2019
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