GWR 813 Failure

Please tell me you didn't used to work at Three Mile Island!

 

I think most places would do similar, having risk assessed the situation. It is just the railways that don't like to do such repairs. I've had a lifetime of doing similar, generally falling into two types; those intended to keep things going until a more permanent repair can be carried out and those where the repair is considered to be the equal of or better than the original and can remain in place.

 

No, somewhere much closer than that. There is much to learn from Meccano but you need to use certified materials.

Sent from my SM-A105FN using Tapatalk

 

Nobody has yet suggested metal stitching. In the marine industry I have seen some quite spectacular disasters put back together using this process and these were all approved by the classification society.

 

See post 35

 

Herewith post 35 - "For what it's worth, I've commissioned a few 3D scans, mostly for fabrications where we need the as-welded form. I've never put out a single casting for manufacture.

The process of scanning and interpreting is increasingly routine; the main trick is in getting a 'watertight' surface that the software can actually recognise as a closed solid. Even then, relatively run of the mill CAD software has got quite good at stitching up surfaces containing gaps where the part was sitting on a support.

Taking the example of scanning an existing part as a pattern, once you've got that watertight solid, things like scaling up for a shrinkage allowance and adding a machining allowance on the appropriate surfaces are basically trivial with current software.

Given that 813 had a casting already, it seems to me that in the interests of authenticity, if it's cost (and performance) competitive to produce a new casting, that is more desirable than to replace with a fabrication. Using a stronger steel (or maybe SG iron) casting in place of the original grey iron seems like an acceptable allowance for the original having broken. No, you probably wouldn't do it that way in modern industry, but there's not much modern about 813 either."


What has the foregoing got to do with metal stitching? I'm suggesting this process ; https://en.wikipedia.org/wiki/Metal_stitching.

 

I'm not too sure that metal stitching would be a viable solution on its own due to the position of the break and the forces involved. It could be used as a part of a belt and braces repair, though.

 

@nick813 . I expect you are aware but in case not the latest NRM Swindon drawings catalogue lists a good number of drawings for PTR locomotives including several relating to "Trailing Spring Gear Engines 22-27 Port Talbot Railway".

Jim C

 

A very unusual view of 813. The bunker has been removed for maintenance revealing all the footplate details.

 

The GWR 813 Fund Trustees will be launching a Crowdfunder appeal for the locomotives new drag box. We understand that the new drag box has been cast and is waiting machining.
The current cost for this project is £15000. The Trustees are seeking help to cover the cost of the new drag box. It is hoped that 813 will be back in steam soon for all to enjoy. The Fund thanks all in advance for your support.
photograph: James Westwood

 

Hello, The GWR 813 Fund appeal is now live:

https://www.crowdfunder.co.uk/p/gwr-813s-drag-box-casting-1

many thanks

 

Hello, The GWR 813 Fund appeal is now live:

£500 so far received. Many thanks.

https://www.crowdfunder.co.uk/p/gwr-813s-drag-box-casting-1

many thanks

 

Hello, The GWR 813 Fund appeal is now live:

£560 so far received. Many thanks.

https://www.crowdfunder.co.uk/p/gwr-813s-drag-box-casting-1

Donations can be made via the website:

http://www.gwr813.org/join.html

many thanks

 

Many thank to all who have contributed to the current total of £1285.00.


https://www.crowdfunder.co.uk/p/gwr-813s-drag-box-casting-1

 

https://www.crowdfunder.co.uk/p/gwr-813s-drag-box-casting-1

 

This appeal isn't going so well. Not enough wheels or polished brass? It's a very nice little engine and a well-run owners group worthy of support.

 

I was hoping that me plugging the appeal as a comment on the recent upload about its 23rd anniversary since its 1st proper steaming in preservation on Facebook the other day would attract people to hopefully donate. Sadly it clearly didn't.

 

Its of minor interest not being Swindon GWR and arguably a small player at SVR, could be on display for a long time.

 

Well the site just point blank refused to process my payment, so perhaps that is the issue?

Have made a contribution via bank transfer, but will have to send gift aid details separately.

 

I'm sure the society will be enjoying your support in the near future.