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My Scratchbuilt Catenary - Members Projects - More Practical Help - Your Model Railway Club
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 Posted: Sun Dec 20th, 2015 02:06 pm
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Ed
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B&Q and Wickes (Homebase aren't really DIY).

http://www.diy.com/departments/nails-screws-hardware/builders-metalwork/DIY765615.cat

http://www.wickes.co.uk/Products/Building-Materials/Hardware-and-Metalwork/c/1000179

If I do have to resort to metal.....

https://www.eileensemporium.com/index.php?option=com_virtuemart&page=shop.browse&category_id=80&Itemid=9

probably best source but as I said before, far more pricey than styrene.


Ed



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 Posted: Sun Dec 20th, 2015 02:13 pm
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Petermac
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Yes Ed, more expensive than plastic but if plastic isn't suitable ............................

Here's the B&Q aluminium offering:

http://www.diy.com/search/results/?question=square+section+aluminium

If you search "square section steel" or "rod" you'll find their range.  Here, they also do it in brass.

Wickes don't seem to have it online and Eileen's is "modelling quality" therefore much more expensive.

If it is difficult, I could maybe source some here and post it to you .....................:roll::roll:



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 Posted: Sun Dec 20th, 2015 02:37 pm
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Ed
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Haven't given up on styrene yet Peter, but aluminium could be an option.

After all, the Dapol catenary is plastic and seems ok. Although I've read it may be a little flimsy, I've not seen any 'in the flesh'.

There seem to be quite a few layouts using Dapol masts but with no wires, which doesn't look quite right to me. But now Dapol have finally started producing catenary wire sections (which are made of wire) they must believe their plastic masts are capable of holding the weight.

Now I've done the platform wall I can start on catenary mast version 2, using the 5mm square styrene strip, which is 'cheap as chips' :mutley


I'm measuring a new jig as I type.


Ed



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 Posted: Sun Dec 20th, 2015 02:40 pm
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PS: Example

https://www.youtube.com/watch?v=8yUFFnGuiKM



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 Posted: Sun Dec 20th, 2015 03:20 pm
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Petermac
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You're right Ed - it doesn't look good without the wires ...............

I think Dave (westcoast) used gantries throughout rather than posts and hangers .............:roll::roll:

One of my favourite tram layouts (Grime Street) uses brass tube of differing bores slotted one inside the next size up for his posts and NS wire for the overhead although it's not "live" - normal 2 rail operation is the norm.  Naturally for railways, you do need either "H" girder profile or square rather than round.;-)



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 Posted: Mon Dec 21st, 2015 10:19 pm
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Ed
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New style of mast arm on the left, original on the right, both using 5mm square styrene tube for he mast.




The styrene square tube is much more rigid than the H strut, so hopefully one problem solved.

(Think I prefer the original style of arm).

Next job is to make up a 500mm section of catenary and contact wires with droppers, which will probably be the longest section of wire run I'll have.

Probably have to wait until after , I mean Christmas :mutley



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 Posted: Mon Dec 21st, 2015 10:33 pm
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must agree the original arm does look better
:thumbs;-):cool:
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 Posted: Mon Dec 21st, 2015 11:08 pm
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Petermac
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Yep - I'd go with that too - the original design is better. :thumbs



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 Posted: Mon Dec 21st, 2015 11:08 pm
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Silver Fox wrote: must agree the original arm does look better
:thumbs;-):cool:
OPwen

That'll do for me :thumbs

Thanks Owen, I'll stick with arm version 1.


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 Posted: Mon Dec 21st, 2015 11:09 pm
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Petermac wrote: Yep - I'd go with that too - the original design is better. :thumbs

Two votes, definitely the right version then.

Thanks Peter. :thumbs


Ed



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 Posted: Tue Dec 22nd, 2015 07:34 am
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I'd be a 3rd vote for version one Ed. Nice work. 
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 Posted: Tue Dec 22nd, 2015 01:59 pm
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Thanks Marty.

The newer version is actually nearer the Dapol version, which is 'sort of' BR Mk3 catenary.

Bing search produced:-

 http://www.rmweb.co.uk/community/uploads/monthly_06_2010/post-1-12759087499_thumb.jpg

My original cantilever arm is nearer BR Mk1, which had round posts I believe.

But hey, I'm only trying to represent OLE, not model it accurately.


Ed



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 Posted: Tue Dec 22nd, 2015 05:02 pm
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G`day Ed,
Just catching up again with your progress on the masts.
If you go down the styrene tube method you could always insert some threaded rod up the tube to keep it rigid.  It would actually be very strong indeed if you can find a snug fit.  You could take a section of tube with you to the DIY store and try it for size.??
It would be like I suggested back in an earlier post.
http://yourmodelrailway.net/view_topic.php?id=14021&forum_id=52&page=1#p253991
:cheers  Gormo



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 Posted: Tue Dec 22nd, 2015 06:20 pm
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Hi Gormo

Think the styrene square tube will be rigid enough, as the system won't be tensioned and the pantographs won't be touching the wires.

Wouldn't mind getting hold of a Dapol mast for comparison, but I'm not buying a pack 10 for £8 + postage if I'm not going to use them.

Also don't want the catenary too rigid in case I leant on it while doing something else and do myself a mischief. Prefer to replace a mast and some wires, than have a piece of metal stuck somewhere painful :mutley



Ed





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 Posted: Wed Dec 23rd, 2015 04:25 pm
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Yes Mate.....I see your point.!!
It`s making my eyes water just thinking about it.
:mutley

Cheers
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 Posted: Thu Jan 7th, 2016 02:24 pm
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Ed
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Did a quick 'mock-up' yesterday, just to see what this looks like.

The posts are sat on top of the baseboard so they and the contact wire are about 10mm higher than they should be.

The pantograph is also fully extended and it will actually be fixed slightly lower, just below the wire.

From a distance (excuse poor photos, not much light).



Bit nearer.



Looks a bit 'chunky' up close



Definitely too 'chunky'



I've managed to find and order some 4mm square styrene strips to make slightly thinner posts and I'm going to use thinner wire for the post arms.

I've some 0.4mm copper wire and some 0.4mm brass wire to experiment with for the catenary, so next job is make up some new jigs.


Ed




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 Posted: Thu Jan 7th, 2016 06:09 pm
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Great Work, Looks pretty good



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 Posted: Thu Jan 7th, 2016 11:29 pm
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getting there Ed,
:thumbs;-):cool:
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 Posted: Fri Jan 8th, 2016 12:28 am
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Ed
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Thanks Aaron, Owen.

It appears that the 0.4mm copper and brass wire can't really be straightened enough for my purposes and keeps returning to a partially coiled state after stretching and twisting.

Probably OK for a tensioned system, but I don't really want to head down that route.

Going to test some 1/0.6 equipment wire next, which appears to retain a nice straight length, but may not be robust enough.


Ed






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 Posted: Fri Jan 8th, 2016 06:14 pm
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Ed
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Not built any new masts yet and the masts, wires and pantograph are still set high.







Catenary is definitely less 'chunky'.


Ed



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