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Post by Deleted on Jan 21, 2011 17:30:07 GMT
Another setback! Can anyone tell me why I now have a cab roof that looks like a pagoda? I cut the aperture before I rolled it up, perhaps that was the cause. Anyway, try as I might I can't straighten the bugger out so here is one in MS with all the rivet holes drilled first and I'll cut the top and sides out afterwards. I'll put stiffening ribs in the appropriate places, and I'll flatten the top a bit to just 5/16" high. I need a break from the Brit, so no more posts for five or six days as I'm off to the West Country to visit four lots of friends. Honiton, Exmouth, Brixham and Liskeard. Phew. It'll give the SL a run!
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Post by Deleted on Jan 21, 2011 18:37:35 GMT
Hi JB I can see what your saying, I would guess that the prototype would have support ridges around the hole that would stop it flattening out. You may still be able to do this and get the shape back. You could cut the two curved sections to the correct shape using the outer edge as a template. Cut it overlength and Mark where the two edges are in relation to the arc. Move the arches inboard to the hole and clamp in place making sure the previously marked lines along the arc line up with the roof edges. This will push the middle if the roof up to it's correct arc. Then solder the arch to the roof, if the prototype arch doesn't go across the whole width then only solder the section that does, cut off the remainder after. Of course this only works if the prototype has these supports. Engineering wise I would suspect that it did or it was laminated to hold it's shape in stead. Well that's how I think I would tackle this situation... Pete Edit: I meant to say you need supports running up either side of the hole as well .. Hope this helps..:-)
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Post by Deleted on Jan 21, 2011 19:32:36 GMT
Pete, I'll discard the earlier version. I'll put the ribs in before I start cutting any metal..... JB
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Post by chris vine on Jan 21, 2011 20:55:41 GMT
Hi JB, I wonder if your rolls were bending while you rolled it. That way, the rolls would be putting more pressure on the edges of the roof than in the middle. This could cause a bit of stretching of the outside edge which could cause it to distort like it has. A bit late now, but useful to know what caused it. Maybe the mild steel version was just easier to form? Get the roof down on the way to Devon, but remember how narrow their roads are! Chris.
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Post by Deleted on Jan 21, 2011 21:06:02 GMT
Hi Chris, and thanks for the input. The rolls are 300mm long and 50mm diameter, so perhaps they are not the culprits! Jim (Burrell2349) tells me he had exactly the same problem with MS sheet, so it just might be that I made it in the wrong sequence!
Talking convertibles, I'd love to, but it's still hardtop weather out there..... JB
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Post by chris vine on Jan 21, 2011 21:59:12 GMT
Hi JB, What are you doing at the confuser when you could be in the workshop?! No, if the rolls are 2" diameter, I am sure they are stiff enough. You know how the very edge of a piece of metal which has been rolled is not quite as tight a radius as the rest of it. The third roller doesn't quite catch it enough - at least in one direction. I think this is what has happened with your roof. The edge along where your cutout is, has not rolled quite so tightly as the rest of the roof either side of it (front and rear on the loco). I think this has introduced the distortion? ? One thought: (and this is teaching granny to suck eggs) I have found (at least with my rotten rolls) that is is best to roll the work in alternate directions. I seem to get a much more even radius. Also the effect of the roller not quite getting a pull on the edge in one direction gets cancelled out. I am sure you reversed the direction anyway!! Chris.
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Post by Deleted on Jan 21, 2011 22:19:24 GMT
Chris Thanks for the help, and I try to ensure that the rolls are tightened down evenly. I'm not a tin basher by trade, so I'll just reap what I sew (sow?)! I'll get there, eventually.... JB
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Post by mutley on Jan 21, 2011 23:05:56 GMT
Looking good on the Brit My soft top has heated seats doesn't yours? Turn the heater up switch the seat on and away you go.
Andy
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Post by Deleted on Jan 21, 2011 23:13:45 GMT
My soft top has heated seats doesn't yours? Andy Andy. Yes it does, but my lovely lady prefers to keep her hairstyle intact in the cold weather! Mind you, driving through Monaco she was quite happy to stand up in the seat and take pictures... JB
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Post by Deleted on Jan 21, 2011 23:21:57 GMT
Monaco.... Now there's a place I really want to drive to one day, your a lucky man JB,.......
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steam4ian
Elder Statesman
One good turn deserves another
Posts: 2,069
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Post by steam4ian on Jan 21, 2011 23:40:54 GMT
JB
The answer to your question
[quoteCan anyone tell me why I now have a cab roof that looks like a pagoda?[/quote]
Chinese steel!
Regards Ian
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Post by Deleted on Jan 22, 2011 8:50:59 GMT
JB The answer to your question [quoteCan anyone tell me why I now have a cab roof that looks like a pagoda? Chinese steel! Regards Ian[/quote] Don't give up your day job Ian! Cheers JB
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Post by Deleted on Jan 27, 2011 18:31:40 GMT
No-one said it was going to be easy, but it's getting decidedly tricky! The sides have been drilled to take the roof (lucky I still had some decent drills!) and a few temporary rivets put in place. Given the amount of free movement it looks like I will have to put the front panel on the firebox roof to ensure that everything is symmetrical before I make the front panels. The spirit level is there because the sloping firebox creates an unwelcome optical illusion! The roof is a little shorter front-to-back than the drawing as I was a bit careless where I put the first washout plug...... JB
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Post by Shawki Shlemon on Jan 28, 2011 8:31:32 GMT
JB , you are doing very well , don't worry about minor imperfection , non of us who are made by God are perfect ( at least I am not ) , the full size engines were not perfect either , so to be authentic you must have some imperfection , I think you are making these little faults purposely. ;D
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Post by Deleted on Jan 28, 2011 17:52:56 GMT
Onward and Upward! Roof support and rear balcony today. I'm finding that a lot of bits have to be 'temporarily attached and then removed' before one can be confident of the outcome..... First dig out the gadget that you haven't used since war broke out..... Make one that's too fat and not wide enough.... Make another one, this time with wings.... Remember that there are other uses for a Toolmaker's Clamp! Persuade it to fit.... Move on to the balcony and some meditation! I found that some light oil on the patern helped the cutting process. Finished balcony ready for bending. Bent up and resting on the footplate awaiting csk screws. View from the rear. Getting there!
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Post by welshy on Jan 28, 2011 20:51:55 GMT
Looking good JB not an easy job to get it to look right and fit well but you seem to be coping well. Mike
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Post by Deleted on Jan 28, 2011 21:17:47 GMT
not an easy job to get it to look right and fit well. Mike Agreed! Quite expensive on saw blades too..... JB
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Post by Deleted on Jan 28, 2011 21:21:08 GMT
Britania certainly has an involved shape to it's cab JB, not an easy job at all. Looks very good , looking forward to seeing more... Pete
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6233
Hi-poster
Posts: 156
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Post by 6233 on Jan 28, 2011 21:35:03 GMT
JB,
Looking stunning, the workmanship you are putting in to the build is first class. I remember a good friend of mine who I visited one day, he was busy in his workshop fabricating miniature hinges for the tender tool store doors for his 3 1/2" Brit, amazing work. On his 5 inch Black 5 he even made a bucket for the footplate with all the firemans tools in. You will have one fine model when she is finished. I am a fellow Britannia man with a 5 inch Brit. Also a fellow Mercedes man with a ML.
Enjoy your trip.
Mark
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Post by Deleted on Jan 28, 2011 21:46:06 GMT
JB, I remember a good friend of mine who I visited one day, he was busy in his workshop fabricating miniature hinges for the tender tool store doors for his 3 1/2" Brit, amazing work. Mark Thanks Mark, all encouragement gratefully received! However, I'm not sure that I'll live long enough to go into that detail! I'm going to put some floorboards in: does anybody have any details on this? JB
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