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Post by Deleted on Apr 30, 2012 19:01:59 GMT
In the days of LBSC, 5" gauge engines were built with a back-to-back dimension of 4.5/8" between the tyres, a 1/8" gap between the tyre and the frame plate, and 1/8" thick frame plates. This left 4.1/8" as the distance between the frame plates.
Nowadays, we build to 4.11/16" back-to-back between tyres, but the 4.1/8" dimension between frame plates has stuck in the designers' minds for no good reason. Logically, having increased the back-to-back by 1/16", we should also increase the frame spacing by the same amount, so 4.3/16" is a more sensible dimension.
The scale dimension is even greater, usually 4.1/4" to 4.3/8" but we have to allow for the increased flange thickness of our engines, plus a practical working clearance.
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Post by peterseager on May 1, 2012 8:45:32 GMT
Out of interest I looked up what Henry Greenly had to say in his book. He quotes 4 1/16" between frames. He also quotes 1/8" or 5/32" frame thickness but all his drawings shows 5/32" frames which adds up to 4 3/8" over the frames like our 4 1/8" inside with 1/8" frames.
Peter
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Post by Shawki Shlemon on May 1, 2012 10:35:10 GMT
Here we have two standards , one for the fine scale and the other for narrow gauge , people are sometimes using either and that is why I am using the narrow gauge standard on my engine ( the plans are like that , to change it is a lot of work and possible mistakes ) here is the standard for narrow gauge . www.pnc.com.au/~wallison/AALS/Resources/wheels/5_Profiles.gifI am not for or against either standards , just stating a fact .I personally prefer the fine scale 4.688" BB .
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Post by darrenmorton55 on May 8, 2012 22:04:09 GMT
Hello every one I am new to the forum so apologise if this has been posted in the wrong area. I have a 80% built 5" gauge B1 that was being built by my late father. I have finally got my act together and attempting to finish it! This engine has run and I know that the boiler I have for it is it's second one. The question I have is regarding the fire grate and Ashpan. Does this bolt to the frame or is it a removable type with a pin that goes through the frame? Also should this fit within the firebox or just butt up to it? I have spent many hours srcthing my head and reading the drawings but can't seem to work it out. Any info or pictures would be greatly received .
Many thanks
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springbok
Statesman
Building a Thompson Class B1 in 5"g Plus restoring a 3" Fowler steam road Engine "The Wanderer".
Posts: 570
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Post by springbok on May 10, 2012 7:47:38 GMT
Hi Darren Will look at the drawings today and post you back I sure Cris Vine could give you an instant answer if he reads this Bob
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springbok
Statesman
Building a Thompson Class B1 in 5"g Plus restoring a 3" Fowler steam road Engine "The Wanderer".
Posts: 570
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Post by springbok on May 10, 2012 8:57:11 GMT
Hi Darren After looking after all my animals went into the workshop, I have a complete set of the articles for the B1 from the 60s. On pages 452-454 13th Oct 1960 relates to the firegrate and ashpan with assembly instuctions. If you PM me your email address I will scan in the pages and send them to you Daron when you say it has run is this on compressed air as it is the second boiler as you have said been run on steam without a ashpan. no club track would allow this also has the second boiler been tested., was it steamed when the ashpan was missing. could you please clarify the situation. Bob
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kenn
Active Member
Posts: 15
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Post by kenn on Jul 16, 2012 12:59:08 GMT
Hi Guys I am looking for boiler photo including regulator photos. I have finished drawing the boiler but need more details for the regulator. I also need to know the ribs on the firebox, which is the newer design. Ribs all the way to outer plate on the lose standing ones
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Post by RGR 60130 on Jul 16, 2012 20:29:15 GMT
Kenn,
Which particular boiler photos are you looking for? All the regulator details are shown on the drawings - are you sure you have a full set of drawings? In mentioning the "ribs on the firebox" I assume you refer to the crown stays. There are arguments in favour of both the girder type stays and individual round stays. Individual stays are often cited as allowing better circulation. However, fitting them involves drilling lots of holes for them in the firebox crown and outer boiler wrapper. Needless to say they must all be silver soldered and leak free. Girder stays, on the other hand have a lesser potential for leaks and function perfectly well.
Reg
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Post by thefodenman on Jul 19, 2012 12:23:05 GMT
Hi, I had the 'I' section crown stays built into my B1 boiler, which attach to the inside of the boiler outer rapper. I think that was the earlier design. My B1 drawings are for the girder stays which I think is the later design (purchased 1984). I have no idea why it changed I would have thought 'I' section was a better construction, perhaps not as easy to make? I may still have the copy of the drawing if you are interested. Since this thread is about the B1, I have just tried to hydraulic check my boiler with the regulator and fittings. The regulator leaks through . Has anybody got any suggestions (polite ones please!) its not a gusher, just a steady trickle. I can blank off the super heater outlet pipes, however you cannot do that when its finally assembled. I would like to make the valve seal better. Cheers Andy
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springbok
Statesman
Building a Thompson Class B1 in 5"g Plus restoring a 3" Fowler steam road Engine "The Wanderer".
Posts: 570
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Post by springbok on Jul 22, 2012 4:06:44 GMT
I have both sets of the boiler design and am told by Helen of Western Steam tha latest one is the one to use. Bob
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kenn
Active Member
Posts: 15
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Post by kenn on Aug 8, 2012 17:45:33 GMT
Hi All Been busy with my building of my B1, but just wanted to show a update od my cad model which is progressing very nicely Attachments:
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springbok
Statesman
Building a Thompson Class B1 in 5"g Plus restoring a 3" Fowler steam road Engine "The Wanderer".
Posts: 570
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Post by springbok on Aug 9, 2012 5:13:01 GMT
Hi Andy If you have quartered your wheels now is the time to paint them, I know I refer to Chris Vines book a lot (I do not get commision) I think he will be at Harrogate with "Bongo" and flogging his books. lovely chap and willing to give you lots of advice. Liveing in the darkest west country it is a bit to far for me to travel these days. Impressed by your CAD it is certainly comeing along since you first started it. but spotted a few errors also will point you to a chap who has done animation on this valve gear (and many others.) Now going out to look after all the animals. When I get back will post you. Book shows a lovely simple little jig for painting the wheels.
ADVERT. Come to the Thornbury BSMEE Exhibition next week look at our websit for details. Bob.
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springbok
Statesman
Building a Thompson Class B1 in 5"g Plus restoring a 3" Fowler steam road Engine "The Wanderer".
Posts: 570
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Post by springbok on Aug 10, 2012 3:11:08 GMT
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springbok
Statesman
Building a Thompson Class B1 in 5"g Plus restoring a 3" Fowler steam road Engine "The Wanderer".
Posts: 570
|
Post by springbok on Aug 28, 2012 14:45:51 GMT
Hi everyone Have been now waiting 8 months for my boiler and when I enquired was told it would be the same again. Found a company at the Thornbury exhibition who said they could deliver in a week, so guess what I have done. They also stock all the casting boiler bits you name it. They are called Hot Coals Tel 01291650977 E Mail kim_hotcoals@btinternet.com Bob
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Post by Deleted on Aug 28, 2012 16:29:04 GMT
hmm seems this is a common issue with boiler makers, I'll be watching how you get on with interest Bob, not that I'm any where near ready for mine but it's good to plan ahead.. Pete
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Post by Jim on Aug 28, 2012 21:33:39 GMT
I have the same problem Bob. I gave my boiler maker a serious talking to yesterday but he just shrugged his shoulders and went on machining the axle boxes for a Britannia's tender. He had the cheek to say it was still too cold..the lazy twirp! Jim
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springbok
Statesman
Building a Thompson Class B1 in 5"g Plus restoring a 3" Fowler steam road Engine "The Wanderer".
Posts: 570
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Post by springbok on Aug 29, 2012 8:08:28 GMT
Just to say had an email to say will be with me via TNT on tuesday courier now that is service. will keep you posted, he is useing the new I think copper tig welding method, had a look at one on his stand and looks very tidy work. Will keep everyone posted. Bob
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Post by Deleted on Aug 29, 2012 8:29:13 GMT
price would be interesting too if you'd be so kind so we can compare... Pete
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springbok
Statesman
Building a Thompson Class B1 in 5"g Plus restoring a 3" Fowler steam road Engine "The Wanderer".
Posts: 570
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Post by springbok on Aug 29, 2012 11:08:36 GMT
Sure £1650.00 no vat Bob
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Post by Deleted on Aug 29, 2012 11:27:48 GMT
wow.. that makes it even more interesting... Pete
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