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Post by Roger on May 19, 2019 9:25:45 GMT
Interest observation about the 55% stuff, Roger. Cadmium silver solder is still available here in Australia. I've got about 2 kg of the stuff. Paul used a little bit of cadmium on the backhead where it had a pin hole and we wanted to see a bit more of a fillet. The difference is quite marked, it's more yellow and the fillet is much more pronounced where it was used.
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pault
Elder Statesman
Posts: 1,497
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Post by pault on May 20, 2019 19:44:02 GMT
I must admit I was looking at the gap between boiler and cab, and thinking that looks rather snug to get the cladding under. As Paul said to me, it needs a little 'finishing', there is nothing currently on the back which will pull things in a little when attached. Looking at the full size there's a 'right-angled' section that goes around the front face of the spectacle plate to hold the lagging/cleading in place, I'm not sure if the lagging/cladding actually go under the cab front? just one of a number of small things to look into later. cheers Pete Something to remember is that the spectacle plate will stay where you put it but the boiler cladding will move as it and the boiler heat up and cool down.
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Post by Deleted on May 20, 2019 20:48:51 GMT
Hi Paul
All is in hand, Yes the spectacle plate was a little close for comfort but has now been rectified once the reason had been ascertained. Paul's boiler outline is very much to Gresley's GA with it's sloping firebox, Don's is not and relies on the cladding to give it the correct shape. If you look at Don's firebox top it's more or less horizontal, Gresley's had a pronounced taper which Paul has duplicated. This means a slightly smaller backhead is required as Don's, which is overscale, is the same size as the spectacle plate opening and hence the issue. Paul made a new former to form the correct sized backhead which can be seen in the photo's posted last week, it's difficult to see the difference as it's so small, remember the boiler doesn't protrude very far into the cab but it is there. Hope that explains where we are... I have since found a photo of Great Northern's boiler out of the frames when built showing the cladding rig (sorry forgotten the proper name) which is very handy for me as I will use it as a guide for fitting my own cladding.
Cheers
Pete
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mbrown
Elder Statesman
Posts: 1,720
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Post by mbrown on May 20, 2019 20:56:40 GMT
I think the word is "crinoline"! Just right for stately lady like FS!
Malcolm
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Post by Deleted on May 20, 2019 21:05:58 GMT
Thanks Malcolm...for some reason I had climsole in my head which just kept changing to 'plimsoll' so I knew it was wrong...'rig' seemed to explain what I was trying to say well enough..
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,909
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Post by JonL on May 21, 2019 21:06:20 GMT
Climsole is my new favourite word.
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Post by Deleted on May 22, 2019 14:32:09 GMT
Good afternoon everyone Hot of the press we have two photo's direct from Southern Boilers showing the excellent work on the combustion chamber tubes, Paul has been a busy man... cheers Pete
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Post by Deleted on May 22, 2019 17:25:17 GMT
And we have another picture to look at folks, this time the front tube plate.... Pete
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Post by thumpersdad on May 22, 2019 18:00:00 GMT
Wow! The ligaments between some of the tubes look really thin, by eye even thinner than on the drawing, especially in the row just below the superheater tubes.
Perhaps that is just a perception because the boiler tubes have not been installed?
Eric
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Post by simon6200 on May 22, 2019 21:26:20 GMT
Ligaments do look skinny but it won't matter. They are meant to be 3 mm min here, but latest code update might have relaxed that, not sure. Looks like the specified 1-1/4 flues from the photo. I'll be using 1" probably. I love the throatplate!
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Post by Deleted on May 22, 2019 21:33:58 GMT
The work is excellent Simon....the photo is a little misleading...the angle taken and chamfers make it look smaller than it actually is...
Cheers
Pete
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Post by Deleted on May 22, 2019 22:27:55 GMT
I tell you what, it's all go tonight, Adam (Cro fittings) has just sent me the finished rendering for the manifold that he's been working on for me, to say that it's excellent doesn't do it any justice at all. Judge for yourselves chaps... First, the reference ... and now the render which will be 3D printed and then cast in bronze... it looks superb....well done Adam, thank you sir... Pete
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mbrown
Elder Statesman
Posts: 1,720
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Post by mbrown on May 23, 2019 6:33:41 GMT
Does anyone know what those very small valves at the extremities of the full size manifold are for? I have seen them on other manifolds but haven't a clue what they are. The tiny handles look too small for a hand to get a grip, suggesting they might be operated with a key of some kind - and would probably not be used often.
Any clues anyone?
Malcolm
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Post by dhamblin on May 23, 2019 6:44:00 GMT
Boiler's coming on nicely and Adam's done a lovely job with the manifold design. Just a pity the cab design hides it from normal view when fully assembled.
Regards,
Dan
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Post by Deleted on May 23, 2019 6:51:04 GMT
Does anyone know what those very small valves at the extremities of the full size manifold are for? I have seen them on other manifolds but haven't a clue what they are. The tiny handles look too small for a hand to get a grip, suggesting they might be operated with a key of some kind - and would probably not be used often. Any clues anyone? Malcolm Hi Malcolm... Left one is the steam sand supply and right is the lubricator warming valve...I intend to have these valves, whether they will be practical or dummies remains to be seen. The casting will be cored to these parts so it's possible but unlikely due to their size...we shall see.... Cheers Pete
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mbrown
Elder Statesman
Posts: 1,720
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Post by mbrown on May 23, 2019 7:05:09 GMT
Thanks for the enlightenment Pete!
Malcolm
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Post by runner42 on May 23, 2019 7:59:20 GMT
Wow! The ligaments between some of the tubes look really thin, by eye even thinner than on the drawing, especially in the row just below the superheater tubes. Perhaps that is just a perception because the boiler tubes have not been installed? Eric It is important to have a minimum ligament distance because of the possibility of developing air pockets between the tubes causing overheating at that point due to water being displaced. This overheating could cause the joint to fail. This condition is more likely to occur at the firebox tubeplate than the smokebox tubeplate because of the closeness to the fire. The AMBSC Code Part 1 specifies a minimum ligament distance of 4mm minus 0.5 mm, however this is seen to be too stringent and analysis has been done to demonstrate that this figure can be reduced. A paper has been submitted to the Australian Boiler Safety Committee and it is likely that a lower minimum distance will be adopted. Brian
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Post by David on May 23, 2019 8:39:04 GMT
The front of the firebox / combustion chamber looks like a mongrel of a job - I don't blame you for paying someone else to do that!
It's looking great. He's pretty good at that silver soldering game.
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Post by Deleted on May 23, 2019 8:48:23 GMT
The front of the firebox / combustion chamber looks like a mongrel of a job - I don't blame you for paying someone else to do that! It's looking great. He's pretty good at that silver soldering game. I agree, David, I would say he's excellent at this silver soldering lark...
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on May 23, 2019 22:30:19 GMT
Hi Pete,
Paul is doing an extremely good job. I very much like Paul's use of lots of silver solder to the tubes on the firebox tube plate and over the combustion chamber joint. That is how it should look and be done in my book.
Cheers,
Julian
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