Ron Heggs Posted April 26, 2012 Author Share Posted April 26, 2012 Hi Ron - Been 'offline' for a while. Stunning progress! Two things - you say this model will go in a summerhouse? No danger of warping in the heat? Secondly - very early on it looked like you will building the intial structure over a plan. If so - how did you prevent the styrene sticking to the plan? I only ask because I've got to model the girder-work associated with the canopyof a platform at Brisol Temple Meads... Regs Ian Hi, Ian The summerhouse is a brick/concrete structure used in summer to keep us out of the heat on our pool terrace. The temperature rarely rises above 25 deg C inside The paper template is used to hold the curved styrene pieces in place. As each successive piece is fixed I slip my modelling knife under the joint whilst brushing the PlasticWeld over the joint, then remove the knife. So the joint doesn't stick to the template Then the first lot of braces are fixed on top of the curved arch. The arch is then removed, turned over and replaced and the second lot of braces fixed on top. So there is no possibilty of the structure sticking to the paper template Once these braces are fixed the complete arch is removed and all successive braces, etc. are fixed off the template If at any time a styrene joint becomes stuck to a template I slice through the paper to release the styrene, and gently file the offending paper off Ron Link to post Share on other sites More sharing options...
scanman Posted April 27, 2012 Share Posted April 27, 2012 Ron - Thanks for that - a somewhat simpler solution than I had envisaged! I was thinking along the lines of waxing the drawing - but my immediate counterthought was - styrene solvent... The knife approach is much simpler! Regs Ian Link to post Share on other sites More sharing options...
Ron Heggs Posted April 27, 2012 Author Share Posted April 27, 2012 One of the problems encountered, is the slightest difference in length in the suspension hanger and the actual distance between arch and deck beam will cause either a non-contact joint or a slight bending of the suspension hanger So each hanger is made slightly longer than needed, and is successively shaved in length on a trial basis until the fit is exact Some of the bending may be seen in these pictures - latest progress - eight more suspension/hangers to go Link to post Share on other sites More sharing options...
Ron Heggs Posted April 28, 2012 Author Share Posted April 28, 2012 - the first arch suspension/hangers completed - just a couple of hangers to be trimmed to remove the slight bending, and one needs repositioning at its upper end The next steps are to complete the deck plating, and fix the under arch strip to tie in the suspension hangers at their upper attachment points Link to post Share on other sites More sharing options...
N15class Posted April 28, 2012 Share Posted April 28, 2012 This will look really impressive when all three arches are together. Is it not possible to fit the top and bottom anchours and the fix the tie with an overlap? this would then mean the cutting has to be less accurate. Link to post Share on other sites More sharing options...
Ron Heggs Posted April 28, 2012 Author Share Posted April 28, 2012 This will look really impressive when all three arches are together. Is it not possible to fit the top and bottom anchours and the fix the tie with an overlap? this would then mean the cutting has to be less accurate. Hi, Peter This drawing shows the general arrangement of a suspension/hanger - The only attachments are - To the underside of the arch - an area of 0.5mm x 5mm To the top of the deck beam - an area of 1.5mm x 2mm Whilst the links overlap the suspension hanger any reduction in contact areas will reduce the effective load bearing The only possibility to provide some adjustment would be to sandwich a short piece of 0.5 x 2mm strip (say 5mm long) inbetween the two lower links, and then cut the suspension hanger strip about 6mm shorter, so that it is still able to be set between same two lower links with sufficient room, and fixing area to allow the required adjustment without further cutting, etc. I will trial this on the next arch Cheers Ron Link to post Share on other sites More sharing options...
N15class Posted April 28, 2012 Share Posted April 28, 2012 Sounds like it is worth ago. Could save a lot of fiddling. Link to post Share on other sites More sharing options...
randallb Posted May 18, 2012 Share Posted May 18, 2012 This is awesome !! I've just found the thread - and now want an "auto-like" button Link to post Share on other sites More sharing options...
artizen Posted May 22, 2012 Share Posted May 22, 2012 Ron - any updates on your extreme sports modelling masterpieces? Link to post Share on other sites More sharing options...
Ron Heggs Posted May 24, 2012 Author Share Posted May 24, 2012 Ron - any updates on your extreme sports modelling masterpieces? Hi, Ian Have been having a really busy time this last few weeks with demolishing walls for the villa reform, which has left me physically tired, and with aching wrists and arms - not really conducive to a plastic bashing Hoping to have a break within the next couple weeks, when I could be back to a little PlasticWeld sniffing Cheers Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted September 9, 2012 Author Share Posted September 9, 2012 We are off again - trying to catch up after a long period reforming the villa The latest pics. show the second arch ready to receive the legs of the outer 20thou x 60thou T bracing pieces - The Guinness glass only holds water The 40thou x 20thou strips - 28 off 41mm long & 44 off 42mm long ready to go - more pics. later tonight Link to post Share on other sites More sharing options...
Ron Heggs Posted September 9, 2012 Author Share Posted September 9, 2012 Progress tonight - T bracing legs fitted A few cross braces for fitting between the T bracings The first two pairs in situ - completion tomorrow, then flat bracings to be added Link to post Share on other sites More sharing options...
RMweb Premium Siberian Snooper Posted September 17, 2012 RMweb Premium Share Posted September 17, 2012 Hi Ron I've only just heard about this thread and as usual it's absolutely stunning. Civil engineering in miniature it certainly is. I take it that drinking water from a Guinness glass is only a temporary set back. Cheers SS Link to post Share on other sites More sharing options...
Ron Heggs Posted September 17, 2012 Author Share Posted September 17, 2012 Hi Ron I've only just heard about this thread and as usual it's absolutely stunning. Civil engineering in miniature it certainly is. I take it that drinking water from a Guinness glass is only a temporary set back. Cheers SS Thanks for your comments and your numerous 'likes' With only two weeks to go - my long period 'off modelling' means that I will not complete this bridge before the deadline. However, I will continue with the build and keep all informed of my progress Cheers Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted September 23, 2012 Author Share Posted September 23, 2012 See my latest news via this link - http://www.rmweb.co.uk/community/index.php?/topic/28293-manchester-central-castlefield-viaducts-modelling-structures/page__st__1150&do=findComment&comment=792740 Hope you are not too disappointed Cheers Ron Link to post Share on other sites More sharing options...
BlackRat Posted September 23, 2012 Share Posted September 23, 2012 Ron superb! Just dont sneeze! Link to post Share on other sites More sharing options...
Ron Heggs Posted October 19, 2012 Author Share Posted October 19, 2012 Although the Challenge End Date has passed the build continues - The cross-bracings between the outer bracings The arch now awaiting the cross-bracings between the inner bracings Link to post Share on other sites More sharing options...
Ron Heggs Posted October 21, 2012 Author Share Posted October 21, 2012 Started on the internal cross-bracings - 80 strips cut ready for the next 10 sets of bracings The jig is used to set the three differing sizes of cross-braces - The larger one is used for the external (two set) cross-bracings (36 sets) The upper right is used for the internal (four set) cross-bracings (26 sets) The lower right is used for the internal (five set) cross-bracings (10 sets) First four in place - another 22 four cross-brace sets, and 10 five cross-brace sets to go Link to post Share on other sites More sharing options...
ollieholmes Posted November 1, 2012 Share Posted November 1, 2012 Truely stunning work. Please keep it up. Link to post Share on other sites More sharing options...
Ron Heggs Posted November 6, 2012 Author Share Posted November 6, 2012 Progress update - The 10 sets of internal bracings fixed to one half of the arch The remaining set of the 4 set of cross-bracings and 5 sets of 5 cross-bracings ready to be fixed into the internal braces Comparison of 4 & 5 sets of cross braces - next step is to construct the 6 sets of internal bracings and fix into the arch Link to post Share on other sites More sharing options...
Brian D Posted November 12, 2012 Share Posted November 12, 2012 Dear Ron, I am a Chartered Structural Engineer for my sins, now retired, and I am hugely impressed by your model "structural engineering" - just like the real thing but no welding, bolting or rivets! Whilst I have worked on many 12 inch to the foot scale structures, I don't think I could come anywhere close to acheiving what you have in 1:76 scale. Fantastic modelling. I have just a couple of queries - are you using Evergreen styrene and what make of adhesive are you using? I am having some difficulty making some signal box window frames out of Evergreen strips which refuce to stick together with the solvent I am using. I would appreciate you advice. Also, just a warning that all arch structures tend to spread under load so the deck needs to tie the feet of each arch together or, as in a masonry structure, the abutments must be able to resist this lateral force which may be significant under the load of a model loco and train passing over it. I suspect the real bridge relies on massive masonry abutments to resist these horizontal forces. I can't wait to see the finished structure in all its glory. Regards, Brian. Link to post Share on other sites More sharing options...
Ron Heggs Posted November 12, 2012 Author Share Posted November 12, 2012 Dear Ron, I am a Chartered Structural Engineer for my sins, now retired, and I am hugely impressed by your model "structural engineering" - just like the real thing but no welding, bolting or rivets! Whilst I have worked on many 12 inch to the foot scale structures, I don't think I could come anywhere close to acheiving what you have in 1:76 scale. Fantastic modelling. I have just a couple of queries - are you using Evergreen styrene and what make of adhesive are you using? I am having some difficulty making some signal box window frames out of Evergreen strips which refuce to stick together with the solvent I am using. I would appreciate you advice. Also, just a warning that all arch structures tend to spread under load so the deck needs to tie the feet of each arch together or, as in a masonry structure, the abutments must be able to resist this lateral force which may be significant under the load of a model loco and train passing over it. I suspect the real bridge relies on massive masonry abutments to resist these horizontal forces. I can't wait to see the finished structure in all its glory. Regards, Brian. Hi, Brian Thanks for your comments With regard to the styrene which I use for all my structures - most is stripped from Javis sheets and occasionally specific extrusions from Evergreen Joints all made using PlasWeld. Butt the two pieces together tightly and stroke the joint with a small brush dipped in PlasWeld, the joint is solid in seconds Originally, I was going to tie the arches via an underbuilt wire system to prevent spreading, but thought that a better option would be a temporary baseboard 1200mm x 400mm with two large wood blocks which will act as the masonry abutments, and prevent spreading of the arches. (The bridge will eventually be placed in a suitable location in our pool summerhouse where the tracks run from the rest of the layout) Cheers Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted November 14, 2012 Author Share Posted November 14, 2012 Finally managed to complete this half of the arch - - the other half of the arch is now waiting for the delicate touch of solvent on styrene Link to post Share on other sites More sharing options...
Ron Heggs Posted November 15, 2012 Author Share Posted November 15, 2012 96 strips for the 12 (4 sets) of cross braces, and 50 strips cut for the 5 (5 sets) of cross braces Ready to construct the remaining cros-bracings for this arch Link to post Share on other sites More sharing options...
RMweb Premium Ramrig Posted November 17, 2012 RMweb Premium Share Posted November 17, 2012 Hi Ron. Only just discovered this thread. Your use of plastic strip/card is stunning. Not content with Manchester Central you hare building this as well. Once this is finished are you moving on to a scale Forth Bridge? I think in 4mm it is about 9 metres long . Regards Steve Link to post Share on other sites More sharing options...
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