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Mutz_Nutz
05-21-2016, 12:43 PM
Apologies for not knowing the correct terminology, but I am building my boat in two halves and looking to bolt it together for sailing (its a sail canoe but am building as a prototype for what will be the next boat so it may sound over engineered...)

My question is to prevent damaging the sections to be bolted together, should I be using a brass/bronze flanged collar inserted in the bolt through sections to prevent compression of the timber, and if so, where can I buy such items (I am UK based)

Thanks in advance (and i have searched through here but not knowing the exact terminology i didnt find anything...)

Jay Greer
05-21-2016, 12:51 PM
Mutz, If you are planning to use your boat in salt water you might consider using bronze rather than brass as brass will corrode and disintegrate in a salt environment. Here is a likely source for you.
http://www.davey.co.uk/
Good luck with your boat.
Jay

Mutz_Nutz
05-21-2016, 01:01 PM
Thanks, Jay. Yes, it will be both salt and fresh water used.

Link much appreciated!

mattycoops43
05-21-2016, 01:39 PM
Top hat bush is probably the term you're looking for

Mutz_Nutz
05-21-2016, 02:19 PM
Cheers, Matt!

P.I. Stazzer-Newt
05-21-2016, 02:30 PM
Try googling "stainless Steel T-nuts".

MoePorter
05-21-2016, 02:31 PM
Look into bronze plumbing fixtures - fraction of the marine hardware price. You might have to modify then a bit. Maybe just a big & thick washer to spread the compression loads over enough area to avoid deforming the wood. Moe

slug
05-21-2016, 02:38 PM
Apologies for not knowing the correct terminology, but I am building my boat in two halves and looking to bolt it together for sailing (its a sail canoe but am building as a prototype for what will be the next boat so it may sound over engineered...)

My question is to prevent damaging the sections to be bolted together, should I be using a brass/bronze flanged collar inserted in the bolt through sections to prevent compression of the timber, and if so, where can I buy such items (I am UK based)

Thanks in advance (and i have searched through here but not knowing the exact terminology i didnt find anything...)


You mean a compression tube. Fiberglass tube of the correct size works well.

Oversize the hole before seating the compression tube in epoxy

leave the ends long untill cure , then trimm flush.

use oversize washers on the fasteners.

another method is an oversize hole completly filled with high density epoxy filler..once cured drill the correct fastener hole thru the filler plug. The high density filler will act as a compression tube.

for some applications i use these threaded brass or stainless inserts. Thin plywood for instance



once seated the insert is drilled out for correct ID and trimmed flush

http://s32.postimg.org/v8n5q61fp/image.jpg (http://postimage.org/)
image url upload (http://postimage.org/)