redmog
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Post by redmog on Oct 5, 2009 16:36:23 GMT
Still No Tube. If I can't lay my hands on a piece of tube in the next week or so I shall have to roll one up. Baggo was right - 4 1/4" tube is hard to come by. Anyway - quite a while ago I bought an unfinished boiler off ebay. It was going dirt cheap, no one seemed to be bidding, so I had it, knowing that it was costing me less than a set of tubes for my Bantam Cock boiler. I intended to cut them off and use them, and I could have also used the barrel. But It's too good to cut up, otherwise I would be on with my V4 boiler. Looks like making 'Heilan Lassie' next, so as to make use it. I'll get it in the pickle tomorrow ready for close inspection. So I might be jumping ship for a while and carry on with this boiler to keep my hand in. ![](http://i356.photobucket.com/albums/oo1/reklawwc/Forum/P1000366.jpg)
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redmog
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Post by redmog on Oct 6, 2009 15:55:55 GMT
Pickled. I've had it in the pickle today ready for inspection. I've realised I need a larger tank as I could only cover a part area. It looks OK though! There might be the odd dry joint, but I can sort it. Time to start a new thread I think. 'Heilan Lassie Boiler' or 'Thompson's A1 in the Making'? Chris ![](http://i356.photobucket.com/albums/oo1/reklawwc/P1000376.jpg)
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Post by Deleted on Oct 6, 2009 19:06:25 GMT
Pickled. I've realised I need a larger tank as I could only cover a part area. Chris Excellent! I'll be there next week! BTW, I bought a large plastic window box from B&Q for £6.99 and filled it with pickle. The complete boiler goes in luvly! JB
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redmog
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Post by redmog on Oct 6, 2009 20:22:53 GMT
Window Box. Pickled. I've realised I need a larger tank as I could only cover a part area. Chris Excellent! I'll be there next week! BTW, I bought a large plastic window box from B&Q for £6.99 and filled it with pickle. The complete boiler goes in luvly! JB Now thats a good idea JB. I'll get one tomorrow. Mine will only cost £6. 29p because it's 10% off on Wednesdays for the over 60's. at our local B&Q Chris
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Post by Deleted on Oct 6, 2009 20:51:39 GMT
I did the same trick but I didn't really want to give my age away! You can have green or terracotta: which one will SWMBO want? JB
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redmog
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Post by redmog on Oct 17, 2009 13:42:23 GMT
Cardboard Boiler. Made a boiler in card just to check LBSC had got his sizes correct. Much easier to make in card than copper. The sellotape sticks better than that silver solder. Seriously though - I intend lengthening the boiler. I propose putting an extra 1" on the length of the firebox. I will also need to put in an extra row of stays to keep the stay spacing the same. Can anyone spot a problem with this? I can see the advantage of more fire - Is there a disadvantage? The cardboard scale seems to work out right., although an extra 1/4" into the smokebox wouldn't go a miss. Chris ![](http://i356.photobucket.com/albums/oo1/reklawwc/Bantam%20Cock/P1000427.jpg)
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simonwass
Part of the e-furniture
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 17, 2009 15:05:31 GMT
No need to modify a Bantam Cock boiler, its a good steamer already. I used to have great fun with a club members loco years ago, our club track is known to be challenging and she went round with no fuss. Wide fireboxes with combustion chambers rarely struggle to make steam. When you think about it, a similar sized boiler with a narrow firebox doesn't have a much longer grate, so your wide grate is twice as big as it needs to be already. If you make it longer your draught will be less through the grate so your fire will run colder, its a fine balancing act. Run some figures through John B's boiler design spreadsheet.
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redmog
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Post by redmog on Oct 18, 2009 13:41:59 GMT
Boiler Calculations. No need to modify a Bantam Cock boiler, its a good steamer already. If you make it longer your draught will be less through the grate so your fire will run colder, its a fine balancing act. Simon & Baggo - Thank you for sharing your knowledge with me again. You always come up with something for me to think about. A piece of tube of the correct barrel size has now fallen into my lap. 4.25" dia. 16G. seamless copper. The only drawback to it is, is that it is of the correct LBSC size 16G, when I might have gone for something a little thicker, 2mm would have been nice. I ran the boiler specs through the excel software you recommended and came out with these results - Calculated factor of safety at 80 psi Boiler Shell Seamless 7.35 Stayed Surface with heads 7.96 Staybolts 5.45 How do they look? I might increase the staybolt factor Chris
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Post by baggo on Oct 18, 2009 15:12:16 GMT
I would probably decrease the stay spacing down to 0.625" which will increase the CFS on the stayed surfaces. It's a bit low with the spacing at 0.75". Everything else looks fine.
What's the bore and stroke of the cylinders and the wheel diameter? I'll run it through Jim Ewins's formulae and see what comes up.
John
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redmog
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Post by redmog on Oct 18, 2009 15:31:55 GMT
Bore, Stroke Etc.
Thanks John.
Bore - 1.125" Stroke - 1.625" Wheels 4.25"
Chris
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Post by baggo on Oct 18, 2009 15:32:46 GMT
Ok, got the missing info off Reeves website. Basically, the boiler is quite a bit oversize for the 2 cylinder version and that's why it produces plenty of steam. The boiler would actually be just right for a 3 cylinder version! Not too late to add another cylinder Chris ![;)](//storage.proboards.com/forum/images/smiley/wink.png) Only joking ;D Was there a 3 cylinder option in the design by the way? John
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redmog
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Post by redmog on Oct 18, 2009 16:45:57 GMT
Steam to Spare. Hello John. No. Not as far as I know. LBSC Words and Music only shows 2 cylinders. He does mention in the 'Text' that Gresley's loco was a 3 cylinder, but LBSC only designed it to be a 2 cylinder loco. Well - Better to have too much steam than too little I suppose. I'm cracking on now that 4' 8" of tube came my way today. It would be a shame not to live long enough to use it all. Chris ![](http://i356.photobucket.com/albums/oo1/reklawwc/Bantam%20Cock/P1000440.jpg)
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Post by Deleted on Oct 18, 2009 17:04:56 GMT
I'm cracking on now that 4' 8" of tube came my way today. It would be a shame not to live long enough to use it all. Chris When you are old and decrepit you can add some hardwood ends and use it as a track gauge!
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redmog
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Post by redmog on Oct 18, 2009 17:26:37 GMT
Impatient. I couldn't resist getting down the workshop and cutting 13" off, and then squaring up the ends. I hope to cut the slant for the throatplate tonight whilst SWMBO watches X - Factor. It's always a good excuse to get down the workshop - 'I can't watch this rubbish. Change channel or I'll have to go down my workshop' Works every time! ![](http://i356.photobucket.com/albums/oo1/reklawwc/Bantam%20Cock/P1000444.jpg)
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Post by baggo on Oct 18, 2009 18:00:45 GMT
We know who to come to if we need any 4¼" x 16g tube ![;)](//storage.proboards.com/forum/images/smiley/wink.png) ;D
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redmog
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Post by redmog on Oct 20, 2009 19:48:21 GMT
Big Kids. The motivation one can have from finding the correct size tube. Marked out, Cut out, then shaped up the outer wrapper today. Temporarily attached to the barrel by a couple of 10 BA screws and nuts, to be replaced by 1/16" rivets when the time is right. Tomorrows task to be the throat plate, then I should be ready for the silver soldering. Funny how we cannot resist placing the boiler wrapper barrel onto the chassis and standing back to look at it. Like big kids. Everthings falling into the correct place though. ![](http://i356.photobucket.com/albums/oo1/reklawwc/Bantam%20Cock/P1000447.jpg) ![](http://i356.photobucket.com/albums/oo1/reklawwc/Bantam%20Cock/P1000445.jpg)
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ace
Statesman
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Post by ace on Oct 20, 2009 21:01:42 GMT
Liking the build progress, some great workmanship there. I have stopped work on my V2 for this season as I have two small engineering projects I need to tackle first. ace
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Post by Deleted on Oct 20, 2009 23:06:54 GMT
Big Kids. The motivation one can have from finding the correct size tube. Ee baa gum, I feel a bit of competition coming on! JB
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Post by baggo on Oct 20, 2009 23:08:47 GMT
Funny how we cannot resist placing the boiler wrapper barrel onto the chassis and standing back to look at it. Like big kids. How true ;D ![](http://www.baggo.copperstream.co.uk/me/locos/25inch/helen%20longish/boiler5.jpg) John
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redmog
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Post by redmog on Oct 21, 2009 6:31:22 GMT
Keeping Up. Big Kids. The motivation one can have from finding the correct size tube. Ee baa gum, I feel a bit of competition coming on! JB You're right. But it's focusing me on the task. Chris
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