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Post by terrier060 on May 15, 2019 23:15:31 GMT
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on May 15, 2019 23:46:58 GMT
Hi Pete,
Looking very good, and Paul is making a fine job of it so far. I hope your club boiler inspector is up to a tig welded barrel.
The protrusion of the rear of the barrel section into the firebox water space, where water is most turbulent and any restriction here ought to be avoided, is something I am sure Paul will rectify in due course.
I presume the Porche will not be sold to pay for the boiler?!
Cheers,
Julian
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Post by Deleted on May 16, 2019 8:56:42 GMT
Hi Julian
Thank's for your comment, regarding tig and my boiler inspectors and the steampipe support. The support (which is above the water level)is there in Don's design which was cleared by my club's inspectors some years back. As for any Tig welding, there is no issue with using Tig and some inspectors openly prefer it, the Gresley outline that Paul has captured in the shell by using Tig, couldn't be achieved with overlapped silver soldered joints. Paul (Southern Boilers is very well respected within my club,as he is across the country. I have often been asked in the past of my plans for the boiler and when mentioning that I may get a professionally built boiler there is one name that always comes up and that's Paul and Southern Boilers, recognised as the best there is. Also of note is that Paul is currently building two Gresley boilers side by side, the other for a V2 happens to be for a fellow NLSME member...
I have no worries about my boiler and the work that Paul does, IMHO, it's second to none.
cheers
Pete
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Post by simon6200 on May 16, 2019 21:17:33 GMT
Pete, do you think Don's outline of the boiler on the GA looks right? The boiler as specified with overlapped joints fits under it comfortably so should not be a problem. Cladding hides a multitude of sins and about the best engine in our club, a streamlines C38, has a round top boiler with fake belpaire cladding. It is not the only one around either.
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Post by Deleted on May 16, 2019 21:24:10 GMT
Hi Simon I think Don's GA is great...the cladding will give the correct profile as with most model designs. Don't worry about the boiler laps, you'll never see them when finished...
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Post by David on May 16, 2019 22:34:09 GMT
Looks very good. And a good source of reference photos for one way to go about it for the rest of us, thanks.
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Post by runner42 on May 17, 2019 7:52:45 GMT
Hi Pete,
I see that the holes for the stays have been pre-drilled in the throat plate and outer wrapper, for the wrapper I wonder did he drill them before bending the wrapper? To do so would ease the drilling process having a flat plate but the bending would perhaps elongate the holes on the non flat surfaces. I assume he will use the pre-drilled holes as a guide for drilling the holes in the firebox wrapper? Subtle points like that are important issues that are often not declared in how to's in boiler making. Interesting to see an expert's approach, I am sure that I will get more useful points as the build proceeds.
Brian
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Post by simon6200 on May 17, 2019 9:16:02 GMT
He probably drilled them slightly under final size if drilled in the flat. I glue on CAD printouts for stay pitches. Once, to my disbelief, I annealed a wrapper, and the printing on the paper could still be read.
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Post by Deleted on May 17, 2019 10:32:56 GMT
Hi guys Actually, I believe that one of the big mistakes by us amateurs is to drill these holes too tight, you won't get enough penetration if doing it that way. I note that no one has noticed the few extra holes yet(not the extra two rows of crown stays).. see if you can find them and what they are for?... Pete
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,907
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Post by JonL on May 17, 2019 11:26:32 GMT
Hi guys Actually, I believe that one of the big mistakes by amateurs is to drill these holes too tight, you won't get enough penetration if doing it that way... Pete It's things like this that are making me nervous for boiler time! I need to get re-reading my boiler making books... As for the extra holes... I genuinely haven't a clue.
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Post by simon6200 on May 17, 2019 11:30:24 GMT
I meant to be drilled out to size after bending. Certainly don't want the stays ( or tubes) a tight fit, as you say.
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Post by Roger on May 17, 2019 14:08:53 GMT
Hi guys Actually, I believe that one of the big mistakes by us amateurs is to drill these holes too tight, you won't get enough penetration if doing it that way. I note that no one has noticed the few extra holes yet(not the extra two rows of crown stays).. see if you can find them and what they are for?... Pete Hi Pete, This was probably true in the days of Cadmium Silver Solder, but the new stuff is very different. I was told that it would penetrate just about anywhere unless it was a tight press fit. I made some of my fits a little on the loose side and it was a nuisance because they didn't want to fill because the Silver Solder doesn't fill or readily form fillets like the old stuff. I would suggest that you have to make the boiler more accurately these days with nice close fitting joints compared to the old days.
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stevep
Elder Statesman
Posts: 1,070
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Post by stevep on May 17, 2019 17:35:54 GMT
Hi guys Actually, I believe that one of the big mistakes by us amateurs is to drill these holes too tight, you won't get enough penetration if doing it that way. I note that no one has noticed the few extra holes yet(not the extra two rows of crown stays).. see if you can find them and what they are for?... Pete You mean the short row of holes each side, angled down, just behind the throatplate, below the bottom row of stay holes?
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Post by Deleted on May 17, 2019 18:04:06 GMT
Yep...that's the one's Steve...
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stevep
Elder Statesman
Posts: 1,070
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Post by stevep on May 18, 2019 8:16:03 GMT
Wonder what they're for!!
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Post by Deleted on May 18, 2019 8:24:15 GMT
Wonder what they're for!! Ah..that's the question.. .no cash prizes for the correct answer though...I'm skint...I bet you know..it's pretty obvious really.... Pete
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don9f
Statesman
Les Warnett 9F, Martin Evans “Jinty”, a part built “Austin 7” and now a part built Springbok B1.
Posts: 960
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Post by don9f on May 18, 2019 16:38:21 GMT
Are they something to do with supporting a thing you said many, many posts back that you were maybe going to fit in the firebox?
Cheers Don
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Post by Deleted on May 18, 2019 17:26:48 GMT
Certainly is Don....coffee's on me at a future meet...
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don9f
Statesman
Les Warnett 9F, Martin Evans “Jinty”, a part built “Austin 7” and now a part built Springbok B1.
Posts: 960
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Post by don9f on May 18, 2019 17:29:51 GMT
Thanks, I’ll look forward to that!
Don
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Post by simon6200 on May 18, 2019 23:00:35 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.
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