Rivets

SteveB_Sigma33

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The attachment point for my topping lift let go at the weekend. It's a simple piece of metal rivited to the end of the boom.

My question is -
After drilling out the old rivet do I have to use a special type of rivet to withstand the rigors of being exposed to the elements?

Sorry for being a numpty on this!

Oh and all I can say is thank goodness for gas struts. No one ended up with a sore head when it let go
 

DavidGrieves

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Hi Steve

Yes, the special rivets you require are called 'monel' rivets. You should be able to get them from the Marine Super Store Port Solent. Also buy a tube of Duralac, it’s a zinc oxide paste and helps prevent galvanic corrosion between dissimilar metals. put in on the rivet and between boom and the attachment point for the topping lift.
You will need quite a hefty rivet gun, like a pantograph type, as monel rivets take some force to break off, and take care not to scrape the boom when it does go.
 

William_H

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Yes as David says. The rivets are easy to get. asuitable rivet gun (pliers) is not so easy. Can you get at the inside to fit nuts and bolts? or can you drill new holes and thread a 3/16 ww thread into to fit a SS screw or even use self tapping screws in new holes? Screws /rivets set on the side of the boom so load is in shear rather than tension will not let go sop easily but you may not want them there. good luck olewill
 

cliff

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[ QUOTE ]
Hi Steve

Yes, the special rivets you require are called 'monel' rivets. You should be able to get them from the Marine Super Store Port Solent. Also buy a tube of Duralac, it’s a zinc oxide paste and helps prevent galvanic corrosion between dissimilar metals. put in on the rivet and between boom and the attachment point for the topping lift.
You will need quite a hefty rivet gun, like a pantograph type, as monel rivets take some force to break off, and take care not to scrape the boom when it does go.

[/ QUOTE ]'Duralac' Jointing Compound is a yellow paste prepared from elastic varnish of low moisture permeability,
a corrosion inhibiting material, Barium Chromate, and an inert filler, It does not contain Zinc Oxide.
----------
hammer.thumb.gif
“Artificial intelligence is no match for natural stupidity”
Skype id:cliffillupo
 

castaway

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With regard to the riveting tool I have a 'pantograph' or trellis type riveter and I bought it from out local Draper Tool Stop. Can't remember how much but it wasn't too much.

I think if you go to Drapers web site you can order on line, alternatively you're welcome to borrow mine if you want.. I'm around at Wicor Marine at Portchester, and will be at the Folly Inn on Saturday night, 7/8th, or it can be picked up in Bracknell

BTW I bought it to do my mast steps, and they havn't let go yet!

Regds Nick

www.yachtsite.co.uk/fairweather
 

30boat

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The same thing happened to my topping lift fitting but I threaded the holes and fitted it back with machine screws .It is very easy to cut a thread in alloy and the end result is as strong,if not stronger than the original arrangement. I used Loctite stud lock to prevent oxidising of the threads.
 

mikebees

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Lots of cheap riveters on e-bay. Make sure they can handle 4.8mm rivets which is the most likely size you'll use.
Mike
 

DavidGrieves

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[ QUOTE ]
[ QUOTE ]
Hi Steve

Yes, the special rivets you require are called 'monel' rivets. You should be able to get them from the Marine Super Store Port Solent. Also buy a tube of Duralac, it’s a zinc oxide paste and helps prevent galvanic corrosion between dissimilar metals. put in on the rivet and between boom and the attachment point for the topping lift.
You will need quite a hefty rivet gun, like a pantograph type, as monel rivets take some force to break off, and take care not to scrape the boom when it does go.

[/ QUOTE ]'Duralac' Jointing Compound is a yellow paste prepared from elastic varnish of low moisture permeability,
a corrosion inhibiting material, Barium Chromate, and an inert filler, It does not contain Zinc Oxide.
----------
hammer.thumb.gif
“Artificial intelligence is no match for natural stupidity”
Skype id:cliffillupo

[/ QUOTE ]

Hey Cliff

I'm really sorry for the mistake, will the Duralac not work now because I said it contained zinc? How stupid of me!!!

I wouldn't worry too much Steve I don't think your boat is about to fall apart...

Hey Cliff! Who needs artificial intelligence when we have people like you to keep us all right?

Nobody likes a smart arse.
 

aidancoughlan

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Dont worry David, Cliff is probably not trying deliberately to be a smart arse. I think he's a metagurgalist, so probably likes to be precise on the subject. I've been told that Zinc Chromate paste is used for preventing corrosion between different metals (and I've seen Duralec paste mentioned before also). Who cares whats in them though. (ok cliff, I know...).

BTW, my rigger told me not to bother with the pasty stuff if using Monel rivets, since they shouldnt react with aluminium.
 

isandell

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But why did you bother saying that it was zinc oxide? Trying to be a smart arse but getting it wrong? That's worst than being a smart arse and being right.

You seem to be very touchy about being corrected.

Ian
 
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