Re: [Amel Yacht Owners] Rivets for Head sail furling foil


James Alton
 

Vladimir,

   Thanks for the offer and I am glad that you did find the oversized rivets.  I don’t think that I want to use the flush heads because I don’t want to cut away any metal for the countersink so I will pass on your nice offer.  

   I have found that with rivets that are a bit too long that I can usually insert them as far as possible, pull them a bit with the tool which shortens the rivet and push them in the rest of the way.  You might try this with some scrap to be sure that this works on your new rivets.  The initial swelling usually starts near the end of the rivet so the shank should still be loose in the hole (thereby allowing you to insert the rivet further)  if you don’t pull on them too much.

  The rivets on my boat appear to be original so I am hoping that if I am careful removing the old ones that I can use stock 1/4” rivets.  I purchased the following from Fastenal:



Best of luck,

James

SV Sueño
Maramu #220

On May 8, 2018, at 1:29 PM, Vladimir Sonsev sonsev52@... [amelyachtowners] <amelyachtowners@...> wrote:


James, 

Thank you very much. I found oversized 1/4" diameter.  I want to get flush head, aluminum CR 3252.
Box of 100 is a minimum order.
What are you buying? 
Perhaps we can split the box 50-50. Are you interested?

I have some reservations on total length. It is 1mm longer than we have. Perhaps I have to drill inner tube. We will see.

Vladimir 
SM345

On Tue, May 8, 2018, 10:46 James Alton lokiyawl2@... [amelyachtowners] <amelyachtowners@...> wrote:
 

Vladimir,


   I am on the run today but will get back to this soon.  Below is part of an email from my engineering friend in Aerospace that contains suggestions on finding the oversized rivets.  I have definitely seen reference to the oversize rivets on the Cherry rivet site so they must exist.  Here is the Cherry link again,  see page 7


  Thank you for the warning about the 23mm maximum rivet length.  I ordered two sizes from Fastenal since I was unsure of the exact grip length so I think that one of those will fit.

Jim,

There are many blind fasteners made for aircraft by Cherry, Huck, etc.  Most are available "oversize" for rework.  I've seen aluminum rivets with stainless mandrels.  Most achieve good shear strength by breaking the mandrel at the head end, and retaining it.

Best,

James

SV Sueño
Maramu #220

On May 8, 2018, at 9:28 AM, Vladimir Sonsev sonsev52@... [amelyachtowners] <amelyachtowners@...> wrote:


Jams,

Thanks for the links, but unfortunately I can't open FASTENAL link and WONKEEDO link. Those are very important for me.
Cherryaerospace I can open but I don't see oversized rivets.

Pleese keep in mind that maximum rivet length that you can put in, is 23 mm long from the bottom of the head to the very end of the mandrel. If it is longer, you have to drill a second hole in the inner tube of the foil.

Vladimir 
SM 345 "LIFE IS GOOD"

On Tue, May 8, 2018, 07:57 Kent Robertson karkauai@... [amelyachtowners] <amelyachtowners@...> wrote:
 

Thanks James, good info.

Kent
S/V Kristy
Kent,

   I did not finish my research since it sounded like the 1/4” rivets might work for me so I did not source the oversized rivets.  I found some 1/4” (.255 OD) all Aluminum (alloy 5062 for the rivet body, the mandrel however is 7075) structural rivets at Fastenal with a higher shear strength (1300 lbs. min versus about 460) than the more common ones found at Marine stores and have those on order.  I will do some testing before using them on the boat.   I have some concerns about the 7075 mandrel. https://www.fastenal.com/content/product_specifications/RV.BH.STR.ALUM.ALUM.12.pdf

 here is what I found about the removal tool and the oversize rivets:


https://www.youtube.com/watch?v=cNq7EEAvvlA  Video of using the Rivet removal tool

http://www.cherryaerospace.com/product/blindrivets Mention of 1/64” oversize rivets


https://www.wonkeedonkeetools.co.uk/rivets/what-blind-rivet-sizes-are-available/:  Mention of 9/32” rivets but I did not follow up.

Best of luck,

James
SV Sueño
Maramu #220







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