Re: [Amel Yacht Owners] Rivets for Head sail furling foil
Vladimir,toggle quoted messageShow quoted text
Thank you for the information. The Mil-spec maximum hole size for a 1/4” rivet is 265 thousandths and 7mm is 275.5 thousandths. I wonder if the hole size you are reporting has been increased by drilling out the rivet? Or if this hole is being measured in the aluminum extrusion, perhaps the riveting process enlarged the hole some? I am wondering if a 1/4” rivet could be preswelled the additional 10 thousandths to completely fill the hole? I will run this one by an engineering friend to get his opinion.
It would seem that a single pc. of aluminum could be machined to insert into the inside of the extrusion to provide something to tap into if needed. The hole size to tap for an 8mm bolt is 269 thousandths so very close to the hole size that you have. I am unclear if the Amel Owners that are replacing the original rivets with the 8mm bolts are simply tapping the existing holes in the two parts being joined or are inserting some sort of a backing? Could someone enlighten me on whether a backing plate of some sort is needed to convert the original furler rivets to the 8mm bolts? This change would be nice so that I would not have to drill out the rivets each time the furler needed to be removed.
Best of luck,
On May 7, 2018, at 7:17 AM, Vladimir Sonsev sonsev52@... [amelyachtowners] <amelyachtowners@...> wrote: