How many Tons needed for swaging 4mm fittings

rob2

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A fair number of these swaged fittings have failed over the years due to poor design of cheaper swage tools and the pressure required is enormous, so unless you have unlimited facilities to develop the tools it's a non-starter. If you can make the dies, you could probably swage a talurit splice with that pressure, though.

Rob.
 

lw395

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I have DIY crimped 4mm 7x19, using an Ormiston bolt-up tool and copper ferrules.
The tool does not press the whole length of the ferrule at one pass.
This was for the moving bits of a dinghy rig, the 4mm goes around some sheaves in the deck, above that it's 3mm Dyform.
I've done a rough and ready test to satisfy me that the Dyform will probably fail first.
I don't have the numbers to hand.
But it worked.

Guard rails are safety kit, I get a chandler I trust to put proper roll-swages on.

The fitting you show is designed to be roll-swaged I think?
I don't think a plain hydraulic press will do the job anything like the same.
A lot of people use these fittings at a fraction of their rated load, for instance in architecture, you don't want a 2mm wire, it would be like a cheesewire.
Also there is 'ebay stainless' and 'marine stainless'. If it does not say A4 or 316, who knows what it is?
 

Rum Run

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I considered this very seriously last winter, and even asked a question on here. The dies normally sold with the presses on eBay are not the right shape so ideally would need some modification.
In the end I had the guard wires made by Craig Bond of Brightlingsea
 

William_H

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If you are doing the swage type where the wire folds around a thimble and back onto itself then the load is effectively halved. A good thing. However this can also give the possibility of 2 swages onto the wire so doubling your chances of a good attachment. So it might be OK to use the swage press you have presumably using the correct dies.
It may be useful to test load the swages to confirm they are good. Put paint on the end of the swage such that when dry it will crack if there is any movement under load. Not really practical if you need to swage in situ on the boat. But if you cna do a test piece it might rove yur method.
good luck olewill

good luck olewill
 
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