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Post by simplyloco on Aug 7, 2019 17:53:24 GMT
Fire DoorI'm sticking with the backhead for now, preferring to leave the manufacture of the regulator front end to later, when I know a bit more about the subject... This rather nice door came with the engine, and the hinge fits perfectly on a 2mm thick backing piece using the three mounting holes. Unfortunately, I can't find the door closer/keeper arrangement on the drawings. There are three holes predrilled and tapped in a triangular configuration on the LHS, but looking at the (rare) photos of the cab interior there just seems to be a vertical latch swivelling on a pivot pin at the bottom, thus rendering the three holes redundant! Any ideas? John  DSC00152 by inkaboat, on Flickr
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mbrown
Elder Statesman
Posts: 1,794
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Post by mbrown on Aug 7, 2019 19:09:41 GMT
The GNR/LNER door was secured by a sliding latch which worked vertically on the side of the door and engaged with a stud shaped like a pointed mushroom which was attached to the back head a little above the bottom of the door. The latch slid on two shouldered pins so that it could move up and down and engage with the mushroom stud. Not at all sure how that squares with your three holes, so presumably the builder was going for a different arrangement.
I guess you could use the three holes to mount a small plate which carried a mushroom stud, and set it lower down to engage with a sliding catch? Just a thought....
I agree it's a nicely made door, and so much better than the oft-seen LBSC oven door arrangement. Does the flap tilt both ways? Normally, the lower part would swing inwards so that the fireman could shoot the coal through the bottom half of the trap. The tilt of the flap (on the prototype) was controlled by a hinged ratchet at the top. I never thought of this before, but on a model it might be easier to fire through the top half of the flap when it is swung outwards as in your picture as you would be viewing it from a higher angle than a "real" fireman....
Malcolm
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Post by Deleted on Aug 7, 2019 19:49:13 GMT
I have a 5" gauge (actually +5% at my request) drawing for this, kindly scaled for me by Bruce Harvey. As Malcolm states the lower section of the flap goes in allowing the rachet to hold it at various angles depending on how much secondary air is required. I think in our scales any firing would be restricted to having the door fully open. I was admiring a fully working 3 1/2 gauge version on a nice V2 today, everything worked as per prototype including the latch with it's mushroom catch...  Pete |
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Post by qreidford on Aug 7, 2019 19:55:01 GMT
John, On the Reeves 1993 drawing issue for the boiler there are two holes on the left and the three hinge holes on the right. That drawing also shows a door, latch and hinge. However, I much prefer your version which looks loads better than my rudimentary one, I can only imagine the builder had a latching idea in his mind involving the three holes on the left. This is mine - as I said yours looks so much better ☹️  Cheers Q |
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Post by simplyloco on Aug 7, 2019 22:09:23 GMT
I have a 5" gauge (actually +5% at my request) drawing for this, kindly scaled for me by Bruce Harvey. SNIP Pete Name your price for a peek at your drawing!  |
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Post by simplyloco on Aug 7, 2019 22:31:58 GMT
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Post by Deleted on Aug 7, 2019 22:32:53 GMT
I have a 5" gauge (actually +5% at my request) drawing for this, kindly scaled for me by Bruce Harvey. SNIP Pete Name your price for a peek at your drawing! No payment required sir.. PM me your email and I'll try to send it, it's a PDF file Pete |
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Post by chris vine on Aug 7, 2019 22:37:52 GMT
Hi John,
Your firehole door looks lovely. As others have said, it could have been a vertical latch on a tapered mushroom sort of catch stud. However a trip to NRM will reveal all!
On your assembly, I think that maybe the tilting flap is assembled inside out or back to front. You should be able to fire with a shovel at the bottom part and push it open.
Chris.
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Post by simplyloco on Aug 7, 2019 22:44:28 GMT
Hi John, Your firehole door looks lovely. As others have said, it could have been a vertical latch on a tapered mushroom sort of catch stud. However a trip to NRM will reveal all! On your assembly, I think that maybe the tilting flap is assembled inside out or back to front. You should be able to fire with a shovel at the bottom part and push it open. Chris. Hi Chris. The flap is fixed and it covers three vent holes in the door. I'll have a look at making it work properly! I was at the NRM recently and didn't take any photos as I didn't know this would come my way...  John |
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Post by Deleted on Aug 7, 2019 22:56:02 GMT
Here you are John, a nice photo to go with the drawing, you can see the latch held by the mushroom catch...  Cheers Pete |
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Post by simplyloco on Aug 7, 2019 23:06:30 GMT
SNIP The tilt of the flap (on the prototype) was controlled by a hinged ratchet at the top. I never thought of this before, but on a model it might be easier to fire through the top half of the flap when it is swung outwards as in your picture as you would be viewing it from a higher angle than a "real" fireman.... Malcolm Great idea Malcom but as I said to Chris the flap is really only decorative. John |
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jma1009
Elder Statesman
Posts: 5,922
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Post by jma1009 on Aug 7, 2019 23:19:46 GMT
Hi Pete,
Is that a pic of the LBSCR H2 Atlantic on the Bluebell? Seems familiar.
If you are going to make something you ought to do it properly, and the GNR type fire hole door was quite distinctive.
The hinge for the flap wasn't central but elevated. The dished firehole door is very distinctive and well worth replicating in miniature. It was copied for many LBSCR locos during the Marsh era and afterwards, which is why I am familiar with it.
(Griedford could take note of this if he wants, and do a better job of his own firehole door)
John, I have decided not to comment on your safety valve cover, other than you ought to look at that which adorns No.1 in the NRM!
Cheers,
Julian
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Post by simplyloco on Aug 7, 2019 23:29:01 GMT
Hi Pete, Is that a pic of the LBSCR H2 Atlantic on the Bluebell? Seems familiar. If you are going to make something you ought to do it properly, and the GNR type fire hole door was quite distinctive. The hinge for the flap wasn't central but elevated. The dished firehole door is very distinctive and well worth replicating in miniature. It was copied for many LBSCR locos during the Marsh era and afterwards, which is why I am familiar with it. (Griedford could take note of this if he wants, and do a better job of his own firehole door) John, I have decided not to comment on your safety valve cover, other than you ought to look at that which adorns No.1 in the NRM! Cheers, Julian Julian You have just made derogatory comments about three members' builds, my own included. Mind you, it's about the imbibing time... If you can't make constructive comments on this forum backed up by photographic evidence of your prowess may I suggest that you exit stage left? Cheers. John |
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Post by qreidford on Aug 7, 2019 23:54:32 GMT
Julian,
Yes I could have a go at more prototypical firehole door, but as I followed the drawings I went with as I didn’t know any better. At least it works and hasn’t fallen off yet, when it does I may consider a better version - on the other hand I would perhaps prefer to enjoy running the thing, possibly whilst contemplating my second project.
Q
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Post by steamer5 on Aug 8, 2019 4:47:50 GMT
Hi John,
Who’s a happy chappy then? Boy she runs sweet. You’ve certainly got yourself a lovely engine there. I hope you had a couple of soothing ales to celebrate!
Cheers Kerrin
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Post by simplyloco on Aug 8, 2019 7:47:04 GMT
Hi John, Who’s a happy chappy then? Boy she runs sweet. You’ve certainly got yourself a lovely engine there. I hope you had a couple of soothing ales to celebrate! Cheers Kerrin Agreed! Hic! |
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Post by simplyloco on Aug 8, 2019 10:41:24 GMT
Hi folks. Anyone know where I can get a No.3 injector that actually LOOKS like an injector?
Thanks
John
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Post by ettingtonliam on Aug 8, 2019 13:13:42 GMT
Here you are John, a nice photo to go with the drawing, you can see the latch held by the mushroom catch... Cheers Pete Is that a Stirling Single boiler? Just curious, but what is the purpose of the hinged rectangular door on the left hand side of the shot, it doesn't look as if it would close against the boiler because of the projection of the main door, its hinges and flap. |
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Post by simplyloco on Aug 8, 2019 13:56:56 GMT
It strikes me that it offers some radiant heat protection for the fireman when firiing into the part open door?
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Post by ettingtonliam on Aug 8, 2019 14:21:04 GMT
I did wonder about that, but it doesn't seem to have been a common fitting. Was Patrick Stirling so considerate of his firemen?
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