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A skew-built tunnel portal in paper and card - Scratchbuilding. - More Practical Help - Your Model Railway Club
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 Posted: Fri Mar 19th, 2010 03:19 pm
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Chubber
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Herewith pictures of my latest effort, a skew tunnel portal designed to cross a track at about 45 degrees in a bank set at 60 degrees to the baseboard front to back. As nothing is available commercially, and even the very adaptable Scalescenes model wasn't adaptable to being skewed I had to 'scratch' it using Scalescenes red brick paper and my own stone capping print out. 

I started by deciding on the size and shape of the opening, in this case single track of a size that would once have accommodated a single broad gauge line, then cut out it out of thick card. Using that as a pattern I cut another and having printed Scalescenes red brick onto thin card [Rymans, 160 gm/sq m which should go through most printers] I used the two 'male' former shapes to form a trough over which I slotted the front wall, having sandpapered the edges of the opening to match the angle. A drop of PVA and some time later, I cut off the front of the trough and leaving the rear intact glued stiffeners to the sides and outer curve. When all was dry I cut off the back 'former'.

Then, using a ten inch length of capping bricks held together by a 3 mm strip, I cut along the mortar line of all 250 bricks before gluing the 3 mm strip inside the opening, centimetre by centimetre, using PVA which allows the paper to become soft and stretch across its width.  This 'faff' is necessary because the locus of the intersection of the tunnel bore and the vertical face is not a straight line, rather it describes a double ovolo, or a very elongated 'S' shape with straight ends conforming to the vertical parts of the opening.

This left the cut apart bricks standing out like the bristles of a moustache. When the 3 mm strip was safely dry, I moistened the bricks with PVA, half-a-dozen at a time and stuck them down radially as best as I could. Allowed to dry, they were then burnished over with the handle of the knife to give a bull-nose effect.

Then it was just a matter of sticking some walls on, again the geometry proved interesting, the junction of the splayed wall capping and the vertical columns give the impression that they are sloping sideways whereas they are horizontal.  The thick buttresses are built up from multiple layers of 2 mm card, just as the Scalescenes models are.

As in all card modelling of this sort, I think better results are obtained by paying strict attention to cutting, sanding and preserving very sharp edges, and scoring every fold of the paper. To protect the paper from rubbing, spills etc and to increase it's wet strength so that it can be burnished into place I spray it both sides with 'W5' clothing and shoe weather-proofing spray from Lidl [about £3.50 a tin, much cheaper than stuff from artists supplier].

As this will be facing 'north' on the layout, it will be heavily weathered with moss, lichen and dirt so I have done some 'before' pictures just in case someone wants to see details to help them with a similar job.

I hope you like it.

Doug

























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 Posted: Fri Mar 19th, 2010 03:30 pm
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ElDavo
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Lovely piece of work Doug.

Cheers
Dave

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 Posted: Fri Mar 19th, 2010 03:35 pm
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Wheeltapper
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Absolutely superb Doug - gives us mere mortals something to aspire to ! :mutley



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 Posted: Fri Mar 19th, 2010 03:54 pm
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gordons19
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A beautiful piece of work Doug!.....

Top of the class and a Gold Star.:thumbs

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 Posted: Fri Mar 19th, 2010 04:15 pm
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ddolfelin
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Very good indeed.
I expect that soldering iron was really useful in the construction.



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 Posted: Fri Mar 19th, 2010 04:15 pm
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Janner
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You've made a superb job of that Doug :thumbs

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 Posted: Fri Mar 19th, 2010 04:32 pm
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Kevr
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 First rate job there Doug, better than anything you could have bought, if it had been available :doublethumb



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 Posted: Fri Mar 19th, 2010 05:05 pm
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John Dew
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Very impressive  :thumbs:thumbs...........you have certainly succeeded in preserving the sharp lines.........the bull nose effect that I achieve (?) is to me one of the drawbacks of Scalescenes



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 Posted: Fri Mar 19th, 2010 05:10 pm
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Fidge
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That looks really good - well done.

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 Posted: Fri Mar 19th, 2010 05:22 pm
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Chubber
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John Dew wrote: Very impressive  :thumbs:thumbs...........you have certainly succeeded in preserving the sharp lines.........the bull nose effect that I achieve (?) is to me one of the drawbacks of Scalescenes

Gosh! Thanks, chaps....:oops::oops::oops::oops:


John, it's easily worked around, would it be appropriate for me to show how I get sharp wrap-around fold lines in another thread?


Thanks again,


Doug



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 Posted: Fri Mar 19th, 2010 07:29 pm
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georgejacksongenius
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Masterpiece!

:pathead:pathead:pathead

Cheers,John.B.:thumbs

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 Posted: Fri Mar 19th, 2010 09:08 pm
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Sol
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dooferdog wrote:

John, it's easily worked around, would it be appropriate for me to show how I get sharp wrap-around fold lines in another thread?




Doug


There is a saying " is the Pope Catholic?"  -   what do you expect Doug when you ask a question like I have highlighted? 

 Of course, it would be most welcomed.

 

 

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 Posted: Fri Mar 19th, 2010 10:05 pm
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rector
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Yes please, Doug:thumbs



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 Posted: Fri Mar 19th, 2010 10:13 pm
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Chubber
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O.K. Sol, I'll have a try, as an engineer most of what I do is almost instinctive, but I'll have a go at trying to illustrate the three things I still find most difficult, i.e. a tight 'wrap' of a column to give the impression of solidity, a long slim wrap, to give the impression of a homogeneous row of stone slabs and wrapping a rectangular piece of card to give the impression of a solid 'slab' of stone, such as the capitals on my bridge parapet.

Hhm......not to be embarked upon after taking on the evening dose of RLW!  :lol:

Poop poop........

Thinkin' Doofer

Edited to say I'd be pleased if it encouraged other people to try doing wholly scratch-built card and paper or indeed John Wiffen's Scalescenes stuff. No ulterior motives, just that I have corresponded with John since he produced his first texture sheets having been sent some Australian museum artwork by visiting relatives. He's a nice family chap and I regret I will not be able to afford to visit Warley this year where he will have a stand for the first time and meet him face to face.

Doug



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 Posted: Sat Mar 20th, 2010 11:44 am
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jim s-w
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Hi Doug

Looks V nice but (there is always a but isnt there - sorry!) should the arches actually be stepped rather than flat? I thought the bricks that made up the arch are always laid in line with the opening not in line with the front face or is that just on 'pretty' bridges?

See http://www.lostrailwayswestyorkshire.co.uk/images/newtown%20goods/(15-07-06)/viaduct%20south%20canal%20side%20skew%2015-07-06.jpg  Answering my own question it seems not all are like this anyway and its very subtle so forget I asked!  :hmm

Cheers

Jim



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 Posted: Sat Mar 20th, 2010 02:48 pm
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Chubber
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Sorry, Jim, I'm not sure what you are getting at, but you're probably right, I'll have to tear it up and start again.....

or blame the 12"/1ft brigade for leading me astray.





Doug



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 Posted: Sat Mar 20th, 2010 03:35 pm
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jim s-w
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Hi Doug

Nah ignore me - I have seen bridges with what looks like a serated edge to them - I guess those are the more ornate ones!

Cheers

Jim



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 Posted: Sat Mar 20th, 2010 05:55 pm
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Chubber
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Don't worry, jim, there is a drip ring to go all around the opening yet, I've messed this up 3 times already so left it until today, also a refuge to go in, 15 ft inside and other 'doobries' to add yet.

Doug



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 Posted: Sat Mar 20th, 2010 06:51 pm
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Chubber
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As above









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'You may share the labours of the great, but you will not share the spoil...' Aesop's Fables

"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin

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 Posted: Sat Mar 20th, 2010 07:52 pm
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John Dew
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dooferdog wrote: John Dew wrote: Very impressive  :thumbs:thumbs...........you have certainly succeeded in preserving the sharp lines.........the bull nose effect that I achieve (?) is to me one of the drawbacks of Scalescenes

Gosh! Thanks, chaps....:oops::oops::oops::oops:


John, it's easily worked around, would it be appropriate for me to show how I get sharp wrap-around fold lines in another thread?


Thanks again,


Doug


Yes Please!!!

Sorry I didnt get back sooner.....am down with the flu

Regards

 

 



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