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Post by complex on Sept 6, 2020 16:59:10 GMT
Hi,
I have started to attach the smokebox door and the brass hinge broke at the rivet line!
This project is one step forward, 10 back!
I have repaired it with soft solder. Will this last with all the heat in the area?
Many thanks Complex.
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uuu
Elder Statesman
your message here...
Posts: 2,813
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Post by uuu on Sept 6, 2020 17:53:51 GMT
The temperature inside the smokebox is likely to easily exceed the safe limit for soft solder. Whether a hinge on the outside is vulnerable is a moot point.
When the door is closed with the dart and crossbar, the hinge will not be supporting any weight, so it won't fail in use - just when you open the door afterwards.
Me, I wouldn't trust it.
Wilf
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Post by coniston on Sept 6, 2020 20:33:24 GMT
Agree with Wilf, I wouldn't soft solder it not only for the issue of heat but also that of strength considering the frequency of opening the smokebox door and from experience the abuse the hinges can suffer whilst cleaning the smokebox and tubes. Personally I would make new hinges and for preference in stainless steel. If you want to repair the one that broke then silver solder should be used to at least obtain pretty much the same strength as the parent metal.
Good luck
Chris D
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Post by complex on Sept 7, 2020 10:12:30 GMT
Many thanks. I think I’ll make the smokebox door again!
I think I must have made several of everything!
The chassis does run like the clappers on air though. I filmed it, maybe I’ll try an upload.
Thanks again,
Complex.
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Post by coniston on Sept 7, 2020 12:29:51 GMT
Many thanks. I think I’ll make the smokebox door again! I think I must have made several of everything! The chassis does run like the clappers on air though. I filmed it, maybe I’ll try an upload. Thanks again, Complex. I'm sure you wont regret that decision. Love to see the chassis working, sounds like your getting on very well. Chris D |
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Post by delaplume on Sept 10, 2020 10:30:11 GMT
Hi, I have started to attach the smokebox door and the brass hinge broke at the rivet line! This project is one step forward, 10 back! I have repaired it with soft solder. Will this last with all the heat in the area? Many thanks Complex. Hello there, Just a thought but you haven't actually addressed the real problem and that is}---- Why did the hinge break in the first place ??..........It seems to me that there is some sort of stress showing itself.............maybe due to the sequence of build / assembly ??.... It's important to realise at this stage that the main function of the door being closed is to provide a perfect seal against air being drawn in and destroying the vacuum within.........An early indication of this will be taking a long time to light up and establishing a good fire-bed... So start by fitting the strap to the door and then loose-assemble the door onto the smokebox in it's running position................If you can incorporate a slight alignment lip that fits within the smokebox opening diameter so much the better.... Loose-assemble the hinge body onto the smokebox ring and rough-align the two items... Tighten up then drill through and fit the hinge pin making sure it's not binding.... Open and close the door several times........ it might be a wee bit sloppy when open but that doesn't matter......Close the door and check for contact all the way around.......a small feeler gauge is handy for that.............Remember absolutely NO AIR GAPS !! I hope that's of some help and inspiration ?? Alan PS}------ The golden rule of absolutely NO AIR GAPS applies equally to the fit of the smokebox ring into the smokebox shell...........and at the other end the shell over the boiler front extention............and any other openings such as the blastpipe, external steam supply pipes, etc.............You may find the use of fireclay cement helpful.....Time spent wisely at this stage will repay you later when operating your pride and joy !! |
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Post by Roger on Sept 10, 2020 10:51:33 GMT
Many thanks. I think I’ll make the smokebox door again! I think I must have made several of everything! The chassis does run like the clappers on air though. I filmed it, maybe I’ll try an upload. Thanks again, Complex. You might consider making the hinges from something other than Brass which is a pretty weak material. I'd hate to see it break again after going to the trouble of remaking them. There's no reason why the whole assembly can't be made from Steel if you feel so inclined. I'm not sure why Brass and Bronzes seem to be the default materials of choice for so many ME parts when Steel is so much stronger, cheaper and readily available. |
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Post by delaplume on Sept 10, 2020 11:17:10 GMT
Hi Roger,
Agreed ..... I think it's because in the early days suppliers were able to offer castings to beginners as a "Doesn't need too much work" way forwards.....
I still feel that there is an underlying cause for that split though..........Despite Brass being relatively weak it still should not have happened.....IMHO that is ...
here's a good case for some 3D printing !!
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Post by Deleted on Sept 10, 2020 11:29:02 GMT
for me, a deciding factor is are the hinges painted or the other commonly seen burnished steel finish on the prototype, if the later then stainless steel is the way to go...
Pete
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Post by complex on Sept 17, 2020 20:24:00 GMT
Hi,
Does anybody have a photo of the hinge pins to point me in the right direction.
Kind regards,
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Post by delaplume on Sept 17, 2020 20:45:05 GMT
Hi, Does anybody have a photo of the hinge pins to point me in the right direction. Kind regards, Here you go}-------- The first 3 are Super Simplex. and use raised blocks .... the last one is a Mk.1 Simplex....which doesn't     |
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Post by complex on Sept 17, 2020 20:51:41 GMT
Many thanks. Are they silver soldered in to place?
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Post by builder01 on Sept 18, 2020 2:17:43 GMT
Here's how I did it. Quick and effective. The hinge bracket and hinge straps can be shaped more if you feel the need. These are all made from stainless steel. Nothing soldered, all fastened with screws.  DSCN1395 by Builder16, on Flickr |
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Post by complex on Sept 19, 2020 15:46:43 GMT
I have machined the door. All went well although surprisingly difficult to get to run reasonably true!
Still struggling with the hinges....
Tried silver soldering tube to a strap, I think I will cut it out of solid
I’ll give it another go tomorrow.
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Post by builder01 on Sept 19, 2020 15:50:40 GMT
Yes, my straps and "hinge tubes" are made from one solid piece. In the photo, I have not rounded or shaped anything. You can shape the tubes after to make them look more round.
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Post by complex on Sept 19, 2020 16:21:34 GMT
I was going to upload a few photos, but I get an error message......Forum attachment limit reached
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Post by Deleted on Sept 19, 2020 16:36:56 GMT
I was going to upload a few photos, but I get an error message......Forum attachment limit reached You need to use an image hosting site and copy/paste the link to the image tab...click on the 'reply' tab top right to open the full reply page...you can then open the 'lmage' tab and paste the link from your chosen host there. I use Imgur for my images, there are a number of other hosting sites to choose from out there. Pete |
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