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Post by Roger on Apr 29, 2014 23:29:11 GMT
These shots are Gold dust for future reference. I like the idea of the tapped stays but I'm not sure I understand the comment about the 5/32" x 40 threads. Excuse my ignorance, but what's an 'inner firebox doorplate'?
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jma1009
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Post by jma1009 on Apr 29, 2014 23:35:26 GMT
hi roger,
the 'inner firebox doorplate' is generally the fullsize name for the rear flanged plate inside the firebox. it gets called all sorts of other names in ME.
the stays are threaded into this so they can be silver soldered without moving (i used 5/32" x 40 tpi in my case - a standard ME thread size).
cheers,
julian
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Post by Deleted on Apr 29, 2014 23:36:16 GMT
These shots are Gold dust for future reference. I like the idea of the tapped stays but I'm not sure I understand the comment about the 5/32" x 40 threads. Excuse my ignorance, but what's an 'inner firebox doorplate'? -------------- I'm thinking it's the Firebox inner backhead ??........As Julian says}-- It gets called all sorts of things..I've only known it as such because it follows on from the firebox having inner and outer wrappers etc....I like the advanced planning to enable a tea tray to be fitted !! |
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jma1009
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Post by jma1009 on Apr 29, 2014 23:40:26 GMT
i am pretty sure Duncan Ballard of the SVR calls it a an 'inner firebox doorplate' or just 'doorplate'!
'inner backhead' gets a bit confusing with the 'backhead' proper i think - martin evans confusingly often referred to both as 'backhead' which must have caused all sorts of problems for tyros over the years!
cheers,
julian
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Post by Deleted on Apr 29, 2014 23:59:29 GMT
I think from an Engineering designers point of view the term "Firebox inner backhead" accurately states just where and what it is......However a check in Alec farmers book sees him calling it a "Firebox Doorplate" whilst I can only find "Doorplate" in LBSC's Model Locomotive Building.......Must be Railway-based terminology handed down through the years.......Mind you, a Palm stay is not a week-end in a sleazy Cairo Hotel ( Don't ask me how I know !!).......
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Post by ejparrott on Apr 30, 2014 7:57:12 GMT
Firebox door plate to me...
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Post by Roger on Apr 30, 2014 8:39:33 GMT
Thanks, no wonder I was confused. I had visions of some kind of extra inner door???
"Firebox inner backhead" sounds like a description that's difficult to misinterpret, I'm surprised it's not universally known as that.
Anyway, mystery solved and the threading makes life easier I guess. I didn't see it mentioned earlier, but are any other stays threaded eg the ones on the throat plate or on the sides?
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Post by ejparrott on Apr 30, 2014 9:32:45 GMT
All others plain rivets
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Post by Deleted on Apr 30, 2014 14:46:59 GMT
Back in the day ALL the stays were shown as threaded ( and full size ones are anyway ) and then nutted and maybe soldered as well, but over the years and following some trials and experiments by various boilermakers the current system has been accepted.... I'm referring to sizes up to 5" gauge as I'm not too well informed as to 7.25" and upwards.....
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Post by Deleted on Apr 30, 2014 20:09:11 GMT
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jma1009
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Post by jma1009 on Apr 30, 2014 22:46:56 GMT
this might get a bit boring, but here's the inner firebox doorplate silver soldered with the stays to the backhead and firehole ring etc. i ran silverflo 55 over the silverflo 24 joints just to tidy things up a bit . silverflo 24 isnt the easiest thing to use for 'fine' assemblies. incidentally the centred holes in the ends of the stays are very important as a guide when opening up the holes in the backhead so that everything lines up. getting the holes in the backhead for the firehole ring and stay ends is a bit of guess work and careful fitting etc. it is always the way with the firehole ring to backhead, but the stays are an added complication and extra work. cheers, julian    |
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shooter
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If it 'aint broke....don't fix it!
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Post by shooter on Apr 30, 2014 22:55:33 GMT
Never boring Julian. It's a huge help to us mere mortals to be able to see how things look when done correctly. Long may you continue posting.
Cheers Steve
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Post by Deleted on Apr 30, 2014 23:01:43 GMT
Hello JULIAN.......... seems a shame now to hide all that away...... Can you just confirm that the first photo shown here is how the inner doorplate ( Ouch !!---that took some doing for me, LoL !! ) was actually positioned in the hearth and the flame applied from underneath ??.1
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jma1009
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Post by jma1009 on Apr 30, 2014 23:14:49 GMT
hi alan,
i dont think so as pic taken on the table of my Fobco Star pillar drill!
i did prop the plate up between thermalite blocks and heated up from underneath. the silver solder was applied from the top via 'rings' and strips of silver solder on the top.
cheers,
julian
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Post by Deleted on Apr 30, 2014 23:23:48 GMT
Yes, that's what I meant ( Fobco drills being too precious to use as a hearth anyway).....Incidentally I was taking part in a charity Motorcycle ride last Summer which started at}------------ Swadlincote centre !!--- I recalled that distinctive Yellow colour that the FOBCO drill in the Metalwork Classroom at school had....
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Post by Roger on May 1, 2014 7:30:19 GMT
Far from boring Julian, I think we're all making our own boilers in our heads while we watch yours unfold. It's a brilliant reference for when we get that far. There's nothing like seeing it step by step, knowing what it ought to look like.
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Geoff
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Post by Geoff on May 1, 2014 8:08:55 GMT
Julian,
Thanks for all these posts ... it all looks very good and is a different sequence for boiler construction than that proposed by LBSC for Maid of Kent. I was going to thread all my stays and was not looking forward to that prospect!
This thread has made me re-think my heating requirements as well!
Cheers
Geoff
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Post by Deleted on May 1, 2014 14:11:50 GMT
Hi GEOFF--------threading and nutting all those stays used to be the accepted way in the past ( Full-size still are, I hope !!) but the silver soldered "round head copper stay" has been the norm for some time .....Unfortunately this is one of those drawbacks of following a "How to do it" book from back in the day...........My friend and fellow club member John Ellis ( a professional model boiler builder ) and Helen Verral of Western Steam ---http://www.westernsteam.co.uk/about.htm ---- both use this method now
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jma1009
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Post by jma1009 on May 1, 2014 19:33:28 GMT
 Jim asked for a pic of my sievert propane torch. it must be over 25 years old. a 2943 burner is attached which is the largest size i use. ive never ever used the trigger mechanism. it is probably about time i replaced the hose as it is starting to perish. i turn the gas off on the bottle when not in use. the usual hose failure valve is fitted. cheers, julian |
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Post by ejparrott on May 1, 2014 20:03:06 GMT
I always use the trigger, and mine handset is the other way round to yours, saves the reflected heat melting the handles <embarrassed>
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