January 2017- GWR Pagoda corrugated iron shelter

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January 2017- GWR Pagoda corrugated iron shelter

By Martin Leaver

Having a particular interest in the Colonel Stephens railways, it became essential to find a way of producing corrugated iron in our scale, as his buildings were made of little else. I now produce it in large quantities, made from aluminium beer cans, for myself and other modellers.

I started corrugating about a year ago using a metal tube wringer from America. This worked reasonably well, but it’s quite hard to keep the work feeding straight, tending to veer off to one side or the other, so you had to steer it by varying the pressure each side. Also it was only about 3″ wide. So now I have a heavy duty metal corrugator (also from USA) which takes 8″ sheets and has adjustment on both sides (like a mangle) so it always runs true.

The GWR Pagoda shelter at Didcot (Photo: Richard Huss)

I thought the rather attractive GWR pagoda shelter, which I saw at Didcot, would be a challenge, so set to work finding a way to model the roof. I made a crude curving press by cutting a 4” diameter aluminium tube in half lengthways, giving two half shells to press the work between. But fitting two curved convex sheets at 90 degrees was not easy, until I found an old laser rule in my toolbox. Projecting a vertical line onto the corner from the correct angle enabled me to mark the corrugated metal and cut the line accurately…..

Marking the correct angle with a laser rule

But, cutting the material post corrugation is not satisfactory, as it always causes distortion, resulting in wobbly edges. When corrugated the metal shrinks to 81.5%. So, for the Mk2 building I have devised, using some wood and a lot of knicker elastic, The Stretchograph, a stretchable drawing board. Using the laser line I marked out the required shape on thick paper. Transferred this to the Stretchograph. Divided by 81.5. Multiplied by 100, stretched accordingly. Then traced this new shape onto the metal, cut it, then corrugated and curved it. It worked! The corrugation returned it to the correct length and the end curves fitted far better than on the Mk1.

The Stretchograph in action: the required shape on thick paper, traced onto the elastic, which was then stretched to the required shape.

I know there must be a computer programme that can do this much better, but not one compatible with my analog brain.

I made the building out of plasticard, which is easily cut by scoring with a Stanley knife and snapping. Window apertures were difficult until I found that heating up the blade with my little chef’s blow lamp (taking care not to inhale the fumes) meant I could cut right through it.

The finished Mk 1 pagoda

The Mk 1 pagoda sits in late autumn sun

I put in a plywood floor, scored to look like boards, and used windows bought from an eBay doll’s house merchant.

These buildings have a sealing strip which connects the corners of the roof panels. For this I used the copper adhesive tape sold by garden centres to keep slugs off your vegetables.

The Mk 2 pagoda, with space for notices

For the gutters, I used aluminium again, but annealed so it doesn’t argue. Finally, the roof finials are those little yellow rawlplugs with the slots filled in! I’m not happy with the roof ridge. I’d really like to find a way of making a finely detailed decorative strip, to keep off the 16mm scale pigeons, but I’m still working on that one.

Night time scene

The Mk. 2 pagoda features a few changes from Mk1. It’s a bit longer so it more closely resembles the original at Didcot (with space for notices beside the windows). I had to change the way I made the guttering too. Simply bending it into a U is hard to do without banana-ing, so now I’m experimenting with scoring it several times longways, which causes it to bend quite precisely into a half hexagon profile, which might be mistaken for the work of an obscure and long forgotten manufacturer.

Corner detail on the Mk 2 pagoda

2017-01-01T12:27:44+00:00 January 1st, 2017|Model of the Month|14 Comments

14 Comments

  1. S Evans January 1st, 2017 at 12:08 pm

    What was the new corrugator and where did you get it from? Amazon?

  2. Mike Yeadon January 1st, 2017 at 7:59 pm

    Be interested in purchasing the corrugated sheets. How much?

    • Richard Huss January 1st, 2017 at 8:22 pm

      Mike, I’ll forward your enquiry to Martin. (If you’re an Association member, his contact details are also on the annual DVD.)

    • Martin Leaver January 3rd, 2017 at 8:52 pm

      Hi Mike, Thanks for your interest in my Corrugated Iron. For a while now I’ve been supplying this to other modellers via eBay. If you search ‘Model Corrugated Iron’ there you will find it. If you do order some do mention the SMA and I’ll put in a few extra sheets.
      Best Wishes, Martin.

    • Martin Leaver. January 3rd, 2017 at 9:18 pm

      I bought the corrugator from the USA, a company called Out of the Blue Studio, in California . http://www.metalcorrugation.com

  3. Trevor Thompson January 4th, 2017 at 9:17 pm

    A very effective model. Clever creation of corrugated iron in model from. I knew there had to be a way to make it!

  4. Adrian January 7th, 2017 at 1:15 pm

    Great where can I buy this type of roller I’ve use a MARVY but that had plastic rollers I also have one with metal rollers but it does not ” press ” the middle part properly .I do not use drinks cans ,I have thin 0.5 mm . 0.75mm aluminium sheets from 4D models. great web site and shop , the sheets are quite large too so no need to cut up pepsi cans..

    • Martin Leaver. January 10th, 2017 at 10:54 am

      Thanks Adrian, for finding me a supplier of Aluminium sheet. I’ve just ordered some. If it’s good I’ll be able to drink bottled beer again! The machine is at http://www.metalcorrugation.com.

      • Adrian January 10th, 2017 at 4:09 pm

        Martin ,Which one you did buy ? there is one for $ 265 , is that the one ? or was it an other one ? the site pdf isn’t that helpful , can you put me on the right track ! do let me know as I to like to build old tin buildings as per Colonel Stephens. Did you find the 4D web site good ? if you get the chance do pay them a visit the shop is much better than the web site you can spent an age there !, and the staff are helpful too, there’s everything a scratch builder could ever need ! Adrian ..5344

      • Adrian January 11th, 2017 at 1:43 pm

        Hello ,Martin , the other “crimper I have found is a hand held one , is that the one you use ? Adrian

        • Martin Leaver January 11th, 2017 at 10:20 pm

          Yes, It is the $265 + postage and about £60 ransom to pay to the PO before they’ll deliver (vat/duty) but it’s a lovely machine and well worth it. Yes I used the metal hand held job, but screwed to the bench, as you need both hands to work it effectively; One to wind and one to steer. Cheers, Martin.

          • Adrian January 12th, 2017 at 6:21 pm

            Martin , Thanks for that ,I thought so ,bit pricey ,I’ve ordered a tube wrinkle -metal corrugator from e-bay ,the site you suggested is not much help can’t send a message , when I can I’ll treat myself to one, again and thanks, I’m glad to have helped you find somewhere to get you supplies without cutting up beer cans,if you do get the chance do visit there shop ,there’s loads of stuff you’ll find there ,Adrian ..PS what’s the one you use called ?

      • Adrian January 12th, 2017 at 6:24 pm

        Martin ,me again ,if you want rivet detail ,use PECO track pins ,if don’t at present , Adrian

  5. Andrew McMahon January 8th, 2017 at 10:10 am

    Very impressive modelling. I like to see some non loco garden railway modelling work especially when it is as good as this.

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