Wallet Chain--Roundmaille vs. Two-in-One
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TheDragoon

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 Wallet Chain--Roundmaille vs. Two-in-One Posted on Wed Aug 25, 2010 1:05 am Link to Post: Roundmaille wallet chains look very cool, but how do they compare in strength to a normal two-in-one chain? Being roughly round, roundmaille looks like on first glance that it can have more metal packed into a given diameter vs. the "dotted line" profile of two-in-one. But roundmaille has a hollow core and a lot more holes than two-in-one. If a single link of two-in-one chain fails, the chain breaks. Six have to fail in roundmaille.
Cipher

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 Posted on Wed Aug 25, 2010 2:19 am Link to Post: I think you've just answered your own question there... Basically, 2-1 is 6 times more likely to fail than roundmaille by that logic.Too much confusion! I'm going metric
Kirklandkie

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 Posted on Wed Aug 25, 2010 2:48 am Link to Post: If youre really concerned about it breaking you should experiment with running a metal cable through the core of your round chain. You said yourself its essentially hollow. Oh and as you said, 2-1 < 6-1 -kirk
StudioCastile

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 Posted on Wed Aug 25, 2010 4:17 am Link to Post: If you are really that concerned with strength, learn how to fuse, braze, weld, etc, or use split rings. In all but the finest applications either should hold up well.

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 Posted on Wed Aug 25, 2010 5:50 am Link to Post: Roundmail is actually offset rows of three rings. You only need 3 to fail to kill the chain (Provided they're the right 3)

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 Posted on Wed Aug 25, 2010 6:43 am Link to Post: If breaking is a concern, the choice of a useable weave is crucial, and there are several parameters that define this useability. Important is the stability of a single ring - material, AR, closing method define this. Another one is redundancy - e.g. a 2-2-2 chain is more stable than a 1-1-1 one, as two rings each share and 'level' the load, and have to break both at the same time to kill the chain. And, as also mentioned by one writer, the possibility to tweak is one in some cases - the possible steel cable inside a hollow weave is one example. So the roundmaille has more potential to be the more stable weave, but the fact has to be considered that smaller, thinner wire rings have to be used to make a chain of same diameter and weight per length ratio. But if the rings are virtually unbreakable (welded/fused, key rings) - the simple 1-1-1 chain will usually be the strongest weave - not without cause most technical chains are made as 1-1-1. If butted rings are used, often redundancy is needed... To propose other weaves suitable for wallet/key chains: Interesting choices are imho JPL3 and JPL5, Double Spiral, FP6in1, and HP4in1 (that even allows the hollow core cable tweak) - all of these have 'built-in' redundancy. And there are many more weaves that have favorable features for a high-load environment, AND look fancy... -ZiLi- Maille Code V2.0 T7.1 R5.6 Ep Fper MAl Ws\$ Cpbsw\$ G0.3-6.4 I1.0-30.0 N28.25 Ps Dacdejst Xagtw S08 Hip Human societies are like chain mail. A single link will be worth nothing. A chain is of use, but will break at the weakest link. A weak weave will have the need to replace weak links. A strong weave will survive even with weak links included. -'me
TheDragoon

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Posted on Thu Aug 26, 2010 1:57 pm

 AdrianHills wrote: Roundmail is actually offset rows of three rings. You only need 3 to fail to kill the chain (Provided they're the right 3)

Hmmm, the other three rings do carry some of the load, though, right?

In other words, a length of roundmaille would be stronger than three 1-1-1 chains?

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Posted on Thu Aug 26, 2010 2:06 pm

 TheDragoon wrote: In other words, a length of roundmaille would be stronger than three 1-1-1 chains?

Stronger in what terms?

It will actually be less than 3x harder to break, but it will weigh 3x as much.

Strength-to-weight ratio, 2-1 is almost always the strongest chain.
This is why it's what is used as chain, rather than a different design.

If you need a stronger chain, use bigger/stronger links, not more of the smaller ones

(That being said, roundmaille wallet chains look far cooler than 2-1 chain. )

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TheDragoon

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 Posted on Thu Aug 26, 2010 8:48 pm Link to Post: How flexible is JPL3? It has that "looks cool" thing going for it, and has more redundancy than 1-1-1 chain.

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 Posted on Thu Aug 26, 2010 8:52 pm Link to Post: Yeah the possibility of using lower AR rings gives a 1-1 chain the potential to be the strongest. It depends how you compare them. If say you had a pile of rings and made a 1-1 chain and a chain of roundmail from the same sort then I would expect roundmail to be much stronger. If we're just comparing weaves you have to assume the same rings are being used to weave each one. I don't know if roundmail would be stronger than 3 1-1 chains though, you'd have to test it. Strength testing is something that gets promised and not delivered semi-frequently.