Donegal Railway Class 5 Drumboe 15mm scratch build

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SeamusOD
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Donegal Railway Class 5 Drumboe 15mm scratch build

Post by SeamusOD » Thu Sep 05, 2019 1:22 pm

Some background on project,
2019 is the 60yr anniversary of the closure of the narrow gauge railway in Donegal and this has spurred new interest for me personally in the Donegal railways.
Likewise with this 60yr anniversary the Donegal Railway Heritage Centre www.donegalrailway.com are trying to raise funds to get the 4-6-2 Class 5 Drumboe back on display at the museum, initially as a cosmetic restoration, but ultimately back to steam which would be amazing to see.
durmboe home.jpg
So to help I am working on a a 15mm scale (3ft narrow gauge to 45mm track) version of the Class 5's initially all in plywood as I can do it on my laser cutter, which will be available as a kit and generate some funds for the Drumboe project.
Drumboe at the moment is in bits at the railway preservation society in whitehead, but one of her two remaining sisters Meenglas has just came back from a cosmetic restoration and sitting outside the foyle valley museum. below
meenglass3s.jpg
For Narrow gauge these are a big locomotive over 30ft long, and I think around 44 ton.
Having access to meenglas allowed me to go and take loads of pictures and measurments which I have drawn up everything in autocad initially fullsize then scaled down to .0492341 1:20.3 or 15mm scale, having it drawn fullsize allows me to scale it any size really, and having them as proper cad files means down road I could get it made in metal.
Its a bit of a tedious task making each part suitable for laser cutting, to get bits to fit together etc and you can see from the autocad screen shot there is a lot work done on it so far.
meenglas autocad.jpg

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idlemarvel
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Re: Donegal Railway Class 5 Drumboe 15mm scratch build

Post by idlemarvel » Thu Sep 05, 2019 3:47 pm

Very interesting Seamus and I admire your attention to detail. I don't have the patience but I appreciate the efforts of those that do.
Thanks for posting.
Dave Miller
currently building the 5" gauge Circle Line

SeamusOD
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Re: Donegal Railway Class 5 Drumboe 15mm scratch build

Post by SeamusOD » Thu Sep 05, 2019 9:08 pm

This is my first mock up it was rushed together to have in time for a event at the museum a month or so ago, its the basic framework, wheels etc just temp fixed in place, not much else I could do with this type of construction for the boiler, think it will be ok for a static model, in the meantime will look out for a suitable tube about 55/56mm dia, for a full painted one that might roll one day.
smoke box is made up of 15 rings, steam dome and chimney I just 3dprinted for speed but I think might stick with 3dprinting for these especially for the steam dome as I have another made with bigger flare and painted red and it looks fairly good.
There are other details I think will be more practical to 3d print rather than laser cut so its probably going to have both materials rather than initially intended all wood.
15mm drumboe.jpg

DonW
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Re: Donegal Railway Class 5 Drumboe 15mm scratch build

Post by DonW » Thu Sep 05, 2019 11:26 pm

It is a big beastie. Must have been quite a bit of work. How do you do the boiler if you are laser cutting wood?

Don

I typed this in then the picture above appeared when I submitted it. So it is a series of strips. I supposed you could then roll some paper round them to get a smooth shape?

SeamusOD
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Re: Donegal Railway Class 5 Drumboe 15mm scratch build

Post by SeamusOD » Fri Sep 06, 2019 12:43 am

DonW wrote:
Thu Sep 05, 2019 11:26 pm
It is a big beastie. Must have been quite a bit of work. How do you do the boiler if you are laser cutting wood?

Don

I typed this in then the picture above appeared when I submitted it. So it is a series of strips. I supposed you could then roll some paper round them to get a smooth shape?
Not really many other ways to do it other than like smoke box and series of rings, but yes you could wrap it or I think better try to find a cardboard/plastic tube or wooden hand rail same diameter.

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Re: Donegal Railway Class 5 Drumboe 15mm scratch build

Post by SeamusOD » Sat Sep 21, 2019 12:10 pm

Been working on adding the suspension springs and other details to bogies and main wheels
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IMAG3981s.jpg
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