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 Posted: Fri Mar 24th, 2017 09:21 am
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Ed
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I bought some SWG25 0.5mm piano wire as a alternative to 1/0.6mm hook up wire, as a test for making some Catenary for the Dapol masts I recently bought.

However, it comes coiled and I can't seem to consistently straighten it.

Picture below has the first and only bit I manged to straighten, using the one end in a vice and the other in the drill chuck with a small twist method, set in the jig as a contact wire.

The piece above it is one of three I've tried to straighten using the same method, with a resulting deforming twist in the wire.
 


I've also tried hanging a weight on one end of a piece overnight, but it still springs back to curve once the weight is removed.



Probably fine if your using it for a Catenary system under tension, but not a lot of use for my system or using to make hand rails etc.

Maybe stretching it and heating it would work, but seems a bit excessive.

So am I missing something, or is there no easy way to straighten high tensile spring steel wire.


Ed







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 Posted: Fri Mar 24th, 2017 10:57 am
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MaxSouthOz
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I saw a guy straightening wire on YouTube, Ed.

Luke something or other.

I'll see if I can find him.



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 Posted: Fri Mar 24th, 2017 11:01 am
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Here he is.  Luke Towan.

https://www.youtube.com/watch?v=0_guMOYoCpw

His method is about 7 minutes in.



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 Posted: Fri Mar 24th, 2017 11:16 am
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Ed
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Similar to what I do with copper wire Max, work hardens and straightens the wire as you wist.

Just doesn't seem to work with steel.


Ed
 



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 Posted: Sat Mar 25th, 2017 06:27 am
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Petermac
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Tram modellers have exactly the same problem Ed.   They appear to have resorted to buying straight wire for the overhead.................. :thud

Eileen's Emporium, I think, sell it.  I'll look for some pointers............... :cheers



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 Posted: Sat Mar 25th, 2017 11:51 pm
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Brossard
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Nickel Silver wire is hard and straight and takes solder extremely well.  I don't know what size you need but I have used 0.45mm and 0.31mm.  It is my favourite material for jobs requiring wire - like handrails.

John



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 Posted: Sun Mar 26th, 2017 07:02 am
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Ed
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Thanks John, another option if I try straight wire :thumbs


Ed





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 Posted: Sun Mar 26th, 2017 09:51 am
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Ed
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Quick (stupid?) question for John or anyone who might know, is Nickel Steel wire heavier than Piano wire (steel)?

Just thinking about the Dapol plastic masts, which are very flexible.



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 Posted: Sun Mar 26th, 2017 10:17 am
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Petermac
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The simple answer Ed is yes, it is volume by volume, but I suppose it depends on the gauge you use.  If you can get away with thinner nickel silver wire than the piano wire you're using, then it could end up being similar..............

Steel (rolled) weighs in at 7850 kg/cu metre whilst nickel silver weaighs in at 8400 to 8900 per cu. metre - around 10% heavier.



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 Posted: Sun Mar 26th, 2017 10:19 am
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Petermac
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Here's a link to N/S wire at Eileen's Emporium:

https://eileensemporium.com/index.php?option=com_hikashop&ctrl=category&task=listing&cid=4020&name=nickel-silver-wire-up-to-1mm-long-lengths&Itemid=189



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 Posted: Sun Mar 26th, 2017 10:32 am
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Ed
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Thanks Peter :thumbs


Ed



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 Posted: Sun Mar 26th, 2017 04:26 pm
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Hi Ed,

Nickel silver is a brass alloy, not that different to steel re mass. Find a hobby shop that has model plane control systems, the springy control wires are ideal, come in 3 foot lengths and are straight. And with a range of different diameters. For shorter lengths (12") I use P/B wire, which also comes straight and in different diameters. 15 thou' would be equivalent to about 1". To be exactish you would need 13 thou' wire.

Nigel



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 Posted: Mon Mar 27th, 2017 06:55 am
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Ed
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Thanks Nigel.

I've tried some 0.6mm MIG welding wire as well with the same results, so I've given up with coiled wire and ordered some 0.51mm x 36" straight Piano wire from Eileen's Emporium.

Can't be that different from Dapol's own wires.



Ed



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 Posted: Mon Mar 27th, 2017 10:50 am
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Longchap
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Good luck Ed, fingers crossed here that it works a treat.

Bill



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 Posted: Mon Mar 27th, 2017 11:00 am
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Petermac
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A good move I think Ed.  Trying to straighten coiled wire, of any gauge, is nigh on impossible.

It solders well too so that's a bonus over the steel which can be a PITA.



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 Posted: Thu Mar 30th, 2017 07:13 am
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Ed
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Piano wire (high tensile steel) is definitely a PITA to solder.



Searching around the web, it appears that the RC groups use piano wire a lot for plane undercarriage.

Lots of information about flux, silver solder and minimum 40 watt irons.

I have a 100 watt solder gun, but no silver solder of flux.

Should I persevere, try different wire such as Nickel Silver, or give up and stick with the copper 1/0.6 stripped and stretched hook up wire, which I know works but is a little soft  :hmm



Ed








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 Posted: Thu Mar 30th, 2017 07:58 am
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Petermac
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I thought you'd ordered N/S wire from Eileen's Ed ................ :roll: :roll: :roll:

For the price, I'd try some N/S before lashing out on the various fluxes and solders for steel.............. :hmm



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 Posted: Thu Mar 30th, 2017 09:09 am
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Ed
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Petermac wrote: For the price, I'd try some N/S before lashing out on the various fluxes and solders for steel.............. :hmm

I was thinking the same thing Peter, but looking on EE's website it's costs £6 to post some wire costing £3.50.


Ed



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 Posted: Thu Mar 30th, 2017 09:37 am
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Petermac
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I didn't look at the postage costs Ed - was it the same postage for the piano wire ?

If you buy in less than 36 inch lengths, it must surely be cheaper......... :roll:  A 36 inch parcel costs a fair bit to post I'd guess.  I know with track, it's outside the "norm" for Royal Mail (or whatever they're called nowadays) so tends to come by carrier which is usually dearer.



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 Posted: Thu Mar 30th, 2017 10:18 am
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Ed
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Piano wire is 36" and was £3 postage.

It comes slightly coiled, but springs straight once out of the packaging.

Nickel silver 'long' wire is more expensive and is 18", obviously has to be packaged straight therefore is £6 postage.

'Standard length' Nickel silver is only 250mm long which is a bit short for Catenary, but does only cost £3 postage.

Got a feeling I looked at this before I did my original Catenary and was one of the reasons I used 1/0.6 hook up wire. It comes coiled but straightens OK and is fairly cheap.

Just had a look, but there doesn't appear to be anywhere I can pick up suitable wire locally.


Ed





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