General Train Chat Thread, Mamod / PPS powered loco - build in progress! in Trains; I thought it was about time I posted some of my stuff! This is a little steam loco I'm working ...
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Mamod / PPS powered loco - build in progress!
I thought it was about time I posted some of my stuff! This is a little steam loco I'm working on. I wanted to build a small live steam model and the old Mamod locos were always fun. I wanted to see how I could build my own rolling chassis with outside frames and try to get a loco that was far more scale than the little toy looking mamod loco!
It's based very loosely on a Kerr Stuart Sirdar 0-4-0 Tank Engine.
I've changed the dimensions a little to allow the use of 42mm copper tube as the boiler barrel and fitting of PPS Steam Models osscilating cylinders. I also added some crank weights to add something else to watch in the absence of valve gear!
The second image is a quick render of the 3d model of the loco which I've used to generate the toolpaths for cutting out the brass parts. The boiler in the background was a piece of 1 1/4" copper tube I used to practice my silver soldering on.

alan2525's Gallery
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Moderator
Very nice piece of engineering there Alan. I take it the original wouldn't have oscillating cylinders though, or did it?
Love the rivet detail, will look superb when it gets a coat of paint on it.

“Dirty British coaster with a salt-caked smoke stack, Butting through the Channel in the mad March days"
Bunkerbarge's Gallery - Name:
- Richard
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Nope I've used some (a lot of) artistic license on the greasy bits under the footplate. I didnt fancy machining the cylinders and hackworth valve gear on this build! Depending on how well it works out In my next loco I'll probably machine those myself.
alan2525's Gallery
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How did you do your rivets? What wheels have you used?
adrian norris's Gallery
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I used copper rivets from MacModels, to get the exact length I pushed them through a hole drilled in a piece of 4mm aluminium sheet, snipped off the ends and filed to length. I countersunk the holes on the back and then peened the ends over and filed them down flat.
For a raised rivet I use a rivet snap held vertical in a vice and then peen the other end over, finally finishing off with another rivet snap to give a neat appearance. I actually used a blob of bluetack to position the buffer beams on the top of the vice to align everything and keep the bits in place. That way I had two hands free to hold the rivet snap and hammer.
For smaller rivets I was considering buying (or making from a pair of molegrips) one of these tools:
Dave Noble - Tools
I used wheels from IP Engineering for the loco! I was going to turn my own but had some of those spare and they do run nice and true too!
alan2525's Gallery
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Hi Alan, What gauge is your Mamod project going to run on?...narrow gauge looks like.
Have you a layout already? Your brief biopic say's you model anything worth saving, how diverse are your projects?
...I've considered live-steam in OO gauge, but I'm going to wait for a while yet, and see what other models Hornby produce.
You've a fine start to your Engine, you are obviously a very competent machinist, and I hope it goes as good as it's starting to look...excellent rivet detail....
Best wishes...jules
linebacker55's Gallery
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Jules,
The Loco is a 16mm/ft model of a small 2ft gauge Loco it runs on 32mm track. It's based on a Kerr Stuart Sirdar but I've reworked the drawings to allow enough space to fit R/C and gas firing. It's a little longer and a fraction wider too. I'm designing it in CAD as I'm making it too.
In the past I've modelled WW2 subjects and Tamiya 1/20 F1 cars, I've also been interested in Sci-Fi but for some reason the Railway Modelling bug just hit me and thats taking up more of my time.
I've never been a fan of narrow gauge, but my Dad's built a garden railway so I have somewhere to run the loco on! I've always been amazed by model engineering and have never had the confidence to work on a live steam project. I wouldn't call this model engineering as the amount of engineering involved is a minimum using the oscillating cylinders!
It's a learning curve though and now I can happily make things like curved smokebox doors where previously it was a mystery! I've also learned silver soldering and lots of other skills that'll surely be useful in subsequent projects!
alan2525's Gallery
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Soldering...mmm
There's alot more to soldering than most people realise isn't there?
I've made a few Loco's in 4mm scale and I have to use Low-melt solder and be very careful vis-a-vis Iron temperature. The white metal I work with usually dissolves if you go too far with the heat, and I've been very hesitant to use it in any great strength, so I use mostly superglue Gel... and solder only the brass chassis. I use a thirty watt iron for that, but I've found practising on low melt with even an 18 watt iron is risky at best.
any ideas?...jules
linebacker55's Gallery
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- alan2525's Gallery
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I made the chimney on my Taig Lathe today. It's only temporarily fitted in the photo below as I still need to machine the saddle part where it fits onto the smokebox.
I should get around to drilling and threading the footplate and buffer beams - in the photos it's still propped up with a piece of brass flat.
alan2525's Gallery
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