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Old 26-10-2015, 17:32   #31
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Re: Larger last chain link

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Originally Posted by TeddyDiver View Post
How about letting more chain out? Wouldn't leave boat unattended in a such poor anchorage..

ps. or having a snubber to break..
Then you would not go ashore and explore in many, many beautiful places of the world. Which actually cancels any need for anchor, chain and related gear. Stay in marinas, keep the bow light!

You do not know if an anchorage is good or bad beforehand, you simply come back to the boat and discover you have a cruising submarine now ;-)

b.
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Old 26-10-2015, 18:21   #32
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Re: Larger last chain link

Never heard of this happening in real life. Are you speaking of a theoretical situation or something of which you have direct knowledge?
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Old 26-10-2015, 18:56   #33
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Re: Larger last chain link

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Presumably cheaper stuff sold in local chandlery.

Wichard shackles "look ok" but really don't know if they would hold up any better.

Now I will only buy galvanised in a proper rigging store and will not use SS in the anchoring gear at all. This does create issues as noted above. I now have proper end links in both ends of the chain.


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Old 26-10-2015, 19:58   #34
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Re: Larger last chain link

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Now I will only buy galvanised in a proper rigging store....
Galvanised is not a mark of excellence in itself. Make sure they are rated shackles - Crosby being a good example.
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Old 26-10-2015, 22:20   #35
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Re: Larger last chain link

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You do not know if an anchorage is good or bad beforehand,
If I'm uncertain I dive and check so I know

BR Teddy
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Old 27-10-2015, 08:19   #36
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Re: Larger last chain link

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If I'm uncertain I dive and check so I know

BR Teddy
Teddy,

Not if you are anchored in the northern territory nor if you have anchored in deep water. Frankly 90% cruisers are not fit to free dive to anything more than about 10 feet. Too much natural neoprene, to little breath.

So I am in the dive on me club with you but I think we are very alone here.

I think members of the weakest link club rule then.

Cheers,
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Old 27-10-2015, 10:52   #37
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Re: Larger last chain link

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Teddy,

Not if you are anchored in the northern territory nor if you have anchored in deep water. Frankly 90% cruisers are not fit to free dive to anything more than about 10 feet. Too much natural neoprene, to little breath.

So I am in the dive on me club with you but I think we are very alone here.

I think members of the weakest link club rule then.

Cheers,
b.
Got a drysuit a and Thinsulate under wear. 50m is the depth limit for me with air. As long as there's at least a hole in the ice
Thou agree with you, it's not so common..

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Old 27-10-2015, 12:45   #38
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Larger last chain link

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Can you use a tapered punch or drift and a big hammer to enlarge the last link in your chain?

Can and should are 2 different things. If I were going to do so I would pre-heat the piece to 400-500F which would alleviate some or most of the work hardening.

Another approach here is to figure out what your actual demand is and whether an existing shackle will meet that even though it's weaker than the chain. Let's say you want 1500 lb strength for your main chain. 1/4"BBB has a SWL 1300 and 1/4"HT is 2600, so you need the HT if you are going to stay with that size chain. A 5/16" forged shackle has a 3/8" dia. pin which will fit thru a 1/4"'link and has an SWL of 1500lb which meets calculated demand even though it's not as strong as the HT chain.

The first step here is to calculate what you think strength should be.
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Old 27-10-2015, 13:15   #39
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Re: Larger last chain link

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Never heard of this happening in real life. Are you speaking of a theoretical situation or something of which you have direct knowledge?
I do have direct knowledge and I've already posted that. It happened to my brother in law. He is ex navy having had many years at sea. His boat is a 36' strongly built to survey ex charter displacement power boat. Its short stoutly made bowsprit / anchor roller extension broke with a crash when they were anchored. The chain had caught on an undersea obstruction, presumably a rock. The boat had risen up with the tide and or a small wave and pulled the chain tight even though there was plenty of chain let out. The chain didn't break and insurance happily paid repairs. It was earlier this year.

Now you have heard of this happening in real life.
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