Ron Heggs Posted July 12, 2011 Author Share Posted July 12, 2011 Still producing the glazing bars for the canopies, and the trusses for the next viaduct span beam - just a little tedious - so to break the tedium, have started the 65ft station turntable construction Not worth a special drawing, even though it is a unique structure The rails will be fixed using C+L chairs - Details of disc wheels, and well will follow The basic table structure with a single handrail support in place Underside view Table deck and main support beams constructed from 40thou plasticard with detailing in 20thou strip Table walkway and handrail support detail Handrail support detail Handrail support is 40thou x 20thou strip with 0.35mm dia drilled holes for 0.3mm dia brass wire Angle fixings 60thou Evergreen L section strip ... to be continued >>>>> 2 Link to post Share on other sites More sharing options...
Ron Heggs Posted July 13, 2011 Author Share Posted July 13, 2011 Not much done today - ... to be continued >>>>> Link to post Share on other sites More sharing options...
ColinW Posted July 14, 2011 Share Posted July 14, 2011 Hi Ron, you have made a great start with the turntable. Colin Link to post Share on other sites More sharing options...
Ron Heggs Posted July 14, 2011 Author Share Posted July 14, 2011 Hi Ron, you have made a great start with the turntable. Colin Hi, Colin Thanks Have to consider the disc wheels and centre pivot/spindle attachments now Waiting for delivery of 300mm dia cutting compass to start the well construction Cheers Ron Link to post Share on other sites More sharing options...
sir douglas Posted July 16, 2011 Share Posted July 16, 2011 Hello Ron, that sounds like an advert for some cider!!!! Love the bridge work. OzzyO. cest cidre :-) 1 Link to post Share on other sites More sharing options...
Ron Heggs Posted July 17, 2011 Author Share Posted July 17, 2011 The temperature here today was almost 40 deg C in the shade - so modelling has almost stopped On the viaduct build, the deck beams are spaced 28mm apart, that means over the 4.5 metre length there will be some 162 beams required After cutting the first one, the task ahead required a just a little thought - Possible solution - tack a number of blanks together along the edges which will become waste, and cut the curved outline on my bandsaw through all the stacked blanks The blanks are 40thou x 14.5mm x 174mm plasticard Trial run - Stack of 5 blanks after cutting One beam component detached from stack The stack will be filed clean before detaching the separate components This is looking like the way forward - next trial will be with a 10 blank stack Only one thing to look out for - when cutting, the plastic swarf melts on the underside of the stack and causes the stack to catch on the blade opening in the bedplate, but cutting very slowly reduces this problem ... to be continued >>>>> 2 Link to post Share on other sites More sharing options...
artizen Posted July 17, 2011 Share Posted July 17, 2011 You are a very patient man. To even think of cutting 162 curved beams and then shape each one individually to correct profile makes me reach for a strong coffee! Link to post Share on other sites More sharing options...
Ron Heggs Posted July 18, 2011 Author Share Posted July 18, 2011 You are a very patient man. To even think of cutting 162 curved beams and then shape each one individually to correct profile makes me reach for a strong coffee! Hi, Ian That's not the tedious bit I have to fit the top and bottom flanges, and the vertical strengtheners to each beam web Its going to be a long hot summer - and a slow modelling time Cheers Ron Link to post Share on other sites More sharing options...
RMweb Gold bcnPete Posted July 18, 2011 RMweb Gold Share Posted July 18, 2011 The temperature here today was almost 40 deg C in the shade - so modelling has almost stopped Almost I trust you had a glass of something cold and fresh to keep you going Ron Watching with great interest... Link to post Share on other sites More sharing options...
Ron Heggs Posted July 18, 2011 Author Share Posted July 18, 2011 Almost I trust you had a glass of something cold and fresh to keep you going Ron Watching with great interest... Hi, Pete Not something expected - just Agua con gas - Gaseosa - try to keep the alcohol intake down to a minimum - use it mainly for bridge load tests , and my son-in-laws' visits Cheers Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted July 18, 2011 Author Share Posted July 18, 2011 Just a photo of the prototype deck beam details - Copyright Richard_T NO rivets being modelled Note - the tie beam between the two piers - more cross bracing Ron 1 Link to post Share on other sites More sharing options...
artizen Posted July 18, 2011 Share Posted July 18, 2011 No rivets - I can understand why! That's about $1000 worth of rivet sheets from Micro Mark under there and not to be seen when the model is completed either! Link to post Share on other sites More sharing options...
Ron Heggs Posted July 19, 2011 Author Share Posted July 19, 2011 No rivets - I can understand why! That's about $1000 worth of rivet sheets from Micro Mark under there and not to be seen when the model is completed either! Yes, Ian - what the eye will not see, I am not going to grieve over (although it would be nice to model), but enough is enough Still trying to decide whether to do a bit of modelling in this heat, but it saps all your energy and concentration, so may attempt some CAD drawings of the remaining buildings for the layout - pre-Victorian brick built terraced housing, which were close by the viaducts until as late as the 1970s Cheers Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted July 19, 2011 Author Share Posted July 19, 2011 Cut another twenty deck beam blanks, enough for two trials - which were both successful It's cooler in the workshop (its under the drive), so I can carry out some modelling Each stack of 10 blanks produced a lot of swarf making cutting slow. Had to stop every few seconds to allow the plastic swarf to cool and be snapped off, and returned to the bandsaw to continue cutting. So cutting a larger stack would not be a good idea That makes 25 deck beams so far - 137 to go - just need cleaning up, and the ends shaping into quadrants, then the flanges, etc. can be added ... to be continued >>>>> 1 Link to post Share on other sites More sharing options...
Ron Heggs Posted July 19, 2011 Author Share Posted July 19, 2011 Check build of first deck beam - Centre pair of longitudinal rail support beams fitted to check positioning and depth Vertical end T braces fitted All appears OK Will complete the remaining 24 beams and build the deck for the first section of the viaduct ... to be continued >>>>> 3 Link to post Share on other sites More sharing options...
artizen Posted July 29, 2011 Share Posted July 29, 2011 Nine days and no updates? Surely you must be near the end of the 24 beams by now? Missing the regular updates on this epic (can't you tell?). Link to post Share on other sites More sharing options...
Horsetan Posted July 29, 2011 Share Posted July 29, 2011 Nine days and no updates? Surely you must be near the end of the 24 beams by now?..... He's probably decided to put in the hidden rivets after all Link to post Share on other sites More sharing options...
Michael Delamar Posted July 29, 2011 Share Posted July 29, 2011 I think we are all enjoying Ron's updates but best to wait for them when they come. the thread would be half as long if it wasnt for artizen Link to post Share on other sites More sharing options...
Ron Heggs Posted July 29, 2011 Author Share Posted July 29, 2011 Nine days and no updates? Surely you must be near the end of the 24 beams by now? Missing the regular updates on this epic (can't you tell?). He's probably decided to put in the hidden rivets after all I think we are all enjoying Ron's updates but best to wait for them when they come. the thread would be half as long if it wasnt for artizen Hi, Everybody Thanks for your concerns Have been unavoidably involved with urgent family matters Will probably be back on early next week Cheers Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted July 30, 2011 Author Share Posted July 30, 2011 Restarted deck beams build last night - a couple of pictures to show a little progress The longitudinal beams are 27mm long, just fitting between the 40thou deck beams spaced at 28mm centres A little warping is apparent, so will resort to boat/plane construction methods i.e. frame and spars This will mean notching the deck beams (6mm x 20thou), and using continuous 20thou x 6mm strip for the longitudinal beams, then cutting and fixing the 3mm x 23mm long top & 3mm x 27mm long bottom flanges It will also mean construction will be more accurate and quicker, and the assembly stronger with greatly reduced warping Have been examining the CAD drawing of the decking, and found that the deck width varies from span to span (presumably because of the corded curvature of the viaduct) Good job I have only cut the first 27 deck beams The beam & deck widths, with number required - Will cut & use metal templates, to cut and notch the multiple deck beams for each of the varying beam widths - next post will show these templates and their use ... to be continued >>>>> 2 Link to post Share on other sites More sharing options...
RMweb Gold Worsdell forever Posted July 30, 2011 RMweb Gold Share Posted July 30, 2011 Brace yourselves chaps, Ron's back at it... Link to post Share on other sites More sharing options...
iankemp Posted July 30, 2011 Share Posted July 30, 2011 Brace yourselves chaps, Ron's back at it... HEEEEE'SSSS BBBAAAAAACCCCCCCCCKKKKKKKKKK lol!! Link to post Share on other sites More sharing options...
Guest jim s-w Posted July 30, 2011 Share Posted July 30, 2011 Hi Ron Are you sure plastic strip for handrails is going to be strong enough? No problem for the handrail but have you allowed for a derailed loco hitting it? Mind you, you can say that about anything. Cheers Jim Link to post Share on other sites More sharing options...
Ron Heggs Posted July 30, 2011 Author Share Posted July 30, 2011 Brace yourselves chaps, Ron's back at it... HEEEEE'SSSS BBBAAAAAACCCCCCCCCKKKKKKKKKK lol!! Hi, Thanks for the opening calls Will try and keep things flowing again Ron Link to post Share on other sites More sharing options...
Ron Heggs Posted July 30, 2011 Author Share Posted July 30, 2011 Hi Ron Are you sure plastic strip for handrails is going to be strong enough? No problem for the handrail but have you allowed for a derailed loco hitting it? Mind you, you can say that about anything. Cheers Jim Hi, Jim Presume you are referring to the turntable deck handrails The supports maybe plastic, but the handrails will be brass wire. Neither of which would stand up to a derailed loco, as you point out They should be easily repaired if the worst happens, although there shouldn't be any slow speed mishaps Cheers Ron Link to post Share on other sites More sharing options...
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