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At last, I've started stringing my overhead...
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 Posted: Mon Apr 8th, 2013 01:57 pm
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Herb Kephart
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Trev--

.075mm equates to .0029".

Nickle silver wire has a relatively high electrical resistance VS copper or phosphor bronze. You are going to have to put feeder wires every couple feet to keep the voltage drop from becoming a problem.

Overhead wire is something that does not scale down successfully. I have never heard of someone using wire that small, even with an indoor layout with more moderate temperature changes. If you are insistent on scale size wire, I would think that stainless steel would be better--lower coefficient of expansion, and a lot stronger. Still would need an inordinate number of feeders, and solder joints will be a weak point mechanically with any wire that small.

Interesting experiment. I shall be watching--

Herb



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 Posted: Mon Apr 8th, 2013 09:40 pm
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Across the Bridge
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Herb Kephart wrote:
.075mm
We are talking about ~0.7mm diameter wire here Herb, not ~0.07mm diameter!

Will

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 Posted: Tue Apr 9th, 2013 02:23 am
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Herb Kephart
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Gollywillikers-

I thought that I read-

"On the packet it says .075mm 22awg. Confused. So am I....."

Now I understand--you wrote that just to confuse me--

OR-----??    That is maybe-------     But if-------

Oh heck! Wake me up when it's all over.

Herb (I think)




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 Posted: Tue Apr 9th, 2013 09:28 am
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Tramcar Trev
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SZTREWTH ( thats Czek for Strewth) now I'm really confused.... the wire actually measures .715 mm using my digital verynears.... I can feed the trolley wire @ every pole if need be by running a bus underneath and soldering to the base of the brass poles.... Excepting the aluminium poles which I could solder too but I'll "do" a mechanical joint there if necessary. If that dosen't work I'll go back to the multi strand brass.... Maybe I could tin plate it? I used to tin plate PCB's in a hot bath of something.... Electroless tin plate....



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 Posted: Tue Apr 9th, 2013 11:14 am
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Across the Bridge
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Trev, I don't think you'll have much of a problem with wire resistance if you put a feed in every few metres or so. You shouldn't need a feeder on every line pole.

Will

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 Posted: Tue Apr 9th, 2013 02:17 pm
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Herb Kephart
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Agreed.

Herb



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 Posted: Fri May 3rd, 2013 12:02 am
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Tramcar Trev
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Well, yesterday was a historic moment; Car No1 ran about 2 metres under the overhead with complete success several times hey even backpoling without dewiring. I still have a long way to go but I have made afew major advancements to my soldering technique and now use a modified pair of artery forceps to hold the ear to the wire while it is soldered....
Avery brief clip on utoob;
http://www.youtube.com/watch?v=C5Veb6iIcwA&feature=youtu.be



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There once was a man who said Damn!!
I perceive with regret that I am
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in predestinate groves
I'm not a Bus, I'm a tram
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 Posted: Sun May 12th, 2013 08:16 pm
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Dan D Sparks
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Wow! We are in sync! I also have started stringing overhead on my HO layout. How exciting is it to see those trolleys take their first steps! Man- exciting stuff!




A forest of poles ready for overhead wire.

Dandy



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 Posted: Sun May 12th, 2013 11:44 pm
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Tramcar Trev
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I have removed all my overhead, viz: http://trevs-tramway.blogspot.com.au/?zx=1aa433e65a193286

Why don't I listen, I knew that the tinned copper was gunna stretch....

I'm also making an improved trolley wire holder upper....



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There once was a man who said Damn!!
I perceive with regret that I am
A creature that moves
in predestinate groves
I'm not a Bus, I'm a tram
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