redmog
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Posts: 461 
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Post by redmog on Oct 22, 2009 9:43:02 GMT
What Holiday? You're OK for now Chris, take a holiday! JB Thanks JB. I would but - Boiler making's one long holiday. Chris
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kwil
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Posts: 383
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Post by kwil on Oct 23, 2009 9:17:19 GMT
The copper "frit" used in vacuum brazing does run when used on steel. I have used it for complex assembly of many small parts onto a larger "frame". Whether or not the joining would be pressure tight I have no idea. In another thread there is the saga of a MW Black 5 boiler disaster where the "joints" were merely fillets without penetration, I suspect this may also arise from using riveted assembly since aound the rivets, if set in the usual way with a hammer and dolly, will give rise to a local tight metal to metal joint surrounded by an tapered gap, at some point the gap will be too small for penetration by silver solder but wide enought to fail by pressure. I look forward to being proved wrong. I have a flexible borescope of less than 6mm diameter which I use to look inside!  |
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Post by mutley on Oct 23, 2009 9:44:23 GMT
Just a thought JB, but if you had to resolder the inner firebox how did you reflux the mating faces having rivetted everything up? Without havig nthose faces clean and fluxed can you be sure of good penetration and a secure joint or are you mearly gtting fillets around the outside?
Andy
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simonwass
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Cecil Pagets 2-6-2 of 1908. Engine number 2299. Would make a fascinating model....
Posts: 472
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Post by simonwass on Oct 23, 2009 13:48:44 GMT
It is a good point and is impossible to answer properly. The simple fact is that so many rivets were used so these are providing a lot of effort holding it all together, that crown will never fail even if it runs a few miles uncovered  The combustion chamber tubes look brilliant if the solder was applied from one side, if not the good quality fillets tell me they are adhering very well to both parts so are unlikely to fail. Unless JB spent ages with a scratch rod forcing the silversolder to form fillets the joins look quite good. This is only going by the photos, with anything like this complicated (for a beginner) boiler, it needs a good eye in person which is what the new boiler rules have in that the boiler inspector is going to give the assemblies a good once over. Shame I'm hundreds of miles away, I'd like to see it myself. |
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Post by Deleted on Oct 24, 2009 13:51:07 GMT
Sorry Chris, I couldn't leave it alone.......Trial assembly before soldering.Unforunately, because there is a seam along the bottom of the barrell, the tube plate has to be put on after insertion. This is getting quite exciting! Well, for me anyway! JB 
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Post by baggo on Oct 24, 2009 14:52:26 GMT
This is getting quite exciting! Getting exciting for all of us JB ;D John |
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redmog
Part of the e-furniture
Not Morgan weather
Posts: 461
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Post by redmog on Oct 24, 2009 15:03:17 GMT
Premature Return.
Looking Good JB. No more traumas please.
The tube plate normally goes on from the smokebox end.
It's hell of a fiddle pushing it into the barrel and lining up the tubes.
I make up some pieces of dowel that push into the tubes with a turned shoulder for the hole to line up.
Sometimes they just drop in
Sometimes go 'ping' as one jumps out.
I'm taking a domestic break today to keep the 'Good Lady' happy.
Hoping to see the club boiler inspectors tomorrow to show them my proposed changes
- keep everyone happy.
Chris
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Post by drjohn on Nov 5, 2009 5:15:19 GMT
What's going on JB - there's been an eerie silence for almost 2 weeks?
DJ
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redmog
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Posts: 461
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Post by redmog on Nov 5, 2009 10:04:23 GMT
Topping up his Tan. What's going on JB - there's been an eerie silence for almost 2 weeks? DJ He's away - airing his 'speedos' in France. What a thought! Chris
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Post by Deleted on Nov 5, 2009 12:27:19 GMT
Topping up his Tan. What's going on JB - there's been an eerie silence for almost 2 weeks? DJ He's away - airing his 'speedos' in France. What a thought! Chris I shall be back tomorrow pm. AND I've been keeping a beady eye on you......! JB |
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Post by Deleted on Nov 9, 2009 13:44:21 GMT
The combustion chamber doesn't leak!Well, water was coming out of the pump feed union well before it started to leak from my Heath Robinson ex-floor mat gaskets! I refrained from fitting the fire tubes until the thing was tested. Better to be safe than sorry, even though there were club members suggesting that I do without the cross tubes and half of the chamber 'Just in case you get a leak'. Hell, you can't go through life avoiding obstacles - Carpe Diem! Components for test rig: Firehole plug is 5/16" alloy plate  Bottom of firebox linished as flat as possible to mate with the makeshift gasket. Connected up to an old tender pump and tested for major leaks of the gravity kind!  Top put on, bled, and assembled for testing. Notice the tiny piece of steel strategically placed to stop the angle iron from slipping off the doorplate. I wonder if I will be quite so lucky with the main assembly?  Big heat soon...... JB
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Post by dickdastardly40 on Nov 9, 2009 14:28:33 GMT
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redmog
Part of the e-furniture
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Posts: 461
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Post by redmog on Nov 9, 2009 19:24:47 GMT
Useful Test. Good test JB. I hope to have a similar result with my A1 boiler, when I get round to doing it. My added problem is having the tubes already in, but I've learned something from your test and will try a similar approach when I get back on to it. They never look pretty do they. Chris 
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Post by Shawki Shlemon on Nov 10, 2009 8:27:54 GMT
Well done JB , your determination and patience will no doubt lead to a success .keep up the good work and congratulation for the achievements so far .
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Post by Deleted on Nov 12, 2009 21:58:06 GMT
The forum has been a bit quiet of late, so here is a pic of the Brit all cleaned up for its debut at yesterday's 'Bits and Pieces' night at the Southampton SME. I was surprised at the level of interest in the Brit: it turns out that nobody at the club has made a steam boiler for about 15 years! The cheque book has taken over from the brazing torch..... I have now received the one piece of tubing needed to complete the boiler: watch this space! Jb  |
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Post by drumkilbo on Nov 12, 2009 22:04:52 GMT
You're right about the forum being a bit quiet of late JB, so it's really nice to see your Brit again. The chassis and all the motion looks superb in that pic and I'm sure the boiler will be too.
Ian.
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Post by welshy on Nov 12, 2009 22:05:57 GMT
Looking good JB, nice finish on the wheels and motion.
Good to have you back posting the pics .
Mike
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Post by drjohn on Nov 13, 2009 2:30:54 GMT
Honour upon honour - JB has allowed me to talk to him on skype! So I was saying that I'm waiting to see how he gets his hands inside the smokebox to do the plumbing there. I also mentioned about how Baggo copes in that department, with the 2 1/2" gauge stuff - his retort was Ï've been to Baggo's house and he's a very small guy".......... over to you Baggo! ;D ;D ;D
DJ
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Post by Deleted on Nov 13, 2009 14:09:00 GMT
Did a bit more silver soldering today, and the boiler is ready to be assembled: I can't put it off any longer! I received the pressure guage from Reeves yesterday, so I repeated the hydraulic test with stiffer gaskets. Got up to 20lb+ before the gaskets started to leak!  Soldered two rows at a time. I thought I'd imagine I was a brain surgeon and localise the heating......  And this was the result of stage one. Took no more than three minutes to heat up using the 25mm burner.  Close inspection reveals a satisfactory result for stage one.  Ditto repeato for stage two: (Sorry Curly!)  Finished article. Well pleased. The gloves are great: the heat slot kept the heat from radiating as well and I didn't feel a thing!  |
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redmog
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Posts: 461
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Post by redmog on Nov 13, 2009 14:19:58 GMT
Brain Surgeon.
So you did the tubes one row at a time JB ?
In the past I've done them as a cluster,
which makes inspection more difficult.
Nice Idea.
Chris
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