Repair & maintenance: Rivets in carbon

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Rivets in carbon

Printed From: Yachts and Yachting Online
Category: General
Forum Name: Repair & maintenance
Forum Discription: Questions & tips on the subject
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=5636
Printed Date: 15 May 25 at 1:05am
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com

Topic: Rivets in carbon

Posted By: Merlinboy
Subject: Rivets in carbon
Date Posted: 20 Jun 09 at 10:43pm

Hi Guys,

Im sure i have read somewhere on here that you can't just use normal rivets on a carbon mast, but i cant find the thread anywhere. Question is where do i purchase these special rivets that dont squash the mast?

I know you have to put that special paste on to stop the corosion!

Cheers

Russ

Replies:

Posted By: alstorer
Date Posted: 20 Jun 09 at 11:25pm

Are rivets really the only way to attach what you want to attach?

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Al

Posted By: JimC
Date Posted: 21 Jun 09 at 8:47am

There aren't any special rivets that don't damage the mast. That's why rule one is don't use rivets. The effect can be minimised by very careful fitting, most especially making sure the hole you drill is exactly the right size, but in general fittings should be bonded on, not riveted. Rivets are used on the mass production rigs because they are so much cheaper than doing the job properly.

What do you want to do?

Posted By: stuarthop
Date Posted: 21 Jun 09 at 9:07am

You can buy carbon specific rivets. I'm not sure where from as i've always carboned any fittings onto carbon spars or got the rivets out of stock at work. (at my last job not alverbanks). They do compress in a slightly different way to normal rivets

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Posted By: Merlinboy
Date Posted: 21 Jun 09 at 9:12am

Its the haliard cleat at the top of my 300 mast, the old one is worn out and the haliard slips, so i have drilled the old rivets out, but the rivet holes are fairly large, to large for screws really, how do i bound an alloy cleat to the top of the mast? surely it will get pulled out?

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Posted By: alstorer
Date Posted: 21 Jun 09 at 10:40am

Ideally you'd use something high quality, but I reckon even West will do the job well enough. Pick a good day for doing it though, and ideally don't use it for a week.

The key here is surface prep. Sand down both surfaces well, using something like 400 grit paper. Clean them both well with acetone (use white paper towel/kitchen roll- it's clean when this stays clean).

I'd reckon you want to thicken up the resin a little. This will do two things- for one, it'll help shim the gap (the two surfaces won't be the same shape!) and secondly, a slightly thicker bondline (up to a point) helps the strength of the bond (in peel loading).

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Al

Posted By: Jack Sparrow
Date Posted: 21 Jun 09 at 7:12pm

Go here for Carbon rivets.... http://www.sailboats.co.uk/Catalogue%7ECarbon_Rivet___for_carbon_wall_thickness_356mm%7Ep_167032%7Ec4792.html - LINK

you will also want some Anti Corrosion paste... http://www.sailboats.co.uk/Product%7EDuralac_Anti_Corrosion_Paste_DL-0115.html - LINK

or this one, can't remember with one is the best sorry http://www.sailboats.co.uk/Product%7ESuper_Lube_Anti_Corrosion_Gel_3oz__82003.html - LINK

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Posted By: Rockhopper
Date Posted: 21 Jun 09 at 8:55pm

file the holes then re drill and also stick it back on using a sealent called sticaflex great stuff i use it on my fishing boat stick like glue to anything it comes in either black or white

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Retired now after 35 seasons in a row and time for a rest.
2004 national champ Laser5000
2007,2010,National Champ Rs Vareo

Posted By: Merlinboy
Date Posted: 21 Jun 09 at 10:30pm

Cheers Jack thats just what i was looking for.

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