RhB Tm 2/2 93

Loco

Loco

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Winter time is building time. I have started a build of the RhB tractor Tm 2/2 93. This tractor is used at Untervaz together with the larger Gm 4/4 241. Below is a picture from Wikipedia taken by David Gubler:
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First off a 3D model has been made in Inventor based on sketches and pictures of the real thing:
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And when that is done the build can start:
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Most of the parts are scratch built, the motor block is from USA Trains and a few bits, the black ones, are from LGB. I will also use LGB brake hoses. The plan is to install a Massoth LS decoder with HF130 sound, which is the closest sound to the Tm 2/2 as far as I can see. I know that Däppen is preparing a sound from the Tm 2/2 93 for Zimo decoders, but I will not wait for that to be finished. I have also odered a pair of auto uncouplers from Massoth and plan to install those as well. The total modeled weight is 2,2 kg.

The roof and the front railing are press fit and removable. A few parts in the pictures are hold in place temporary with tape, they will be painted seperately and glued to the model when all parts are painted. And painting time is summer time.

- Loco -
 
Gosh, that's impressive..
I thought at first they were 3D renders inserted into photo's.

Am well impressed, if not a little jealous! :( ;)
 
Wow, that is a great piece of workmanship, well done. Can't wait to see the finished model.
 
:othats in a diifernt world.. unbelivable, a fantastic build.. could we have more details of the build please...........
 
Absolutely beautiful. Which USA block did you use? I also would be interested in more build details. Thanks for sharing.
 
The motor block is USA Trains R22-115. The dimensions for this block is not accurate to the real thing, but was the closest I could get. One of the AristoCraft blocks would be closer, but was not available.

As you can see from the table below the deviation is quite large for the block, all dimensions are in mm except for the weight which is in kg:
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Further work on the model:
Side handrails and rear side ventilation doors on the right side have been added. The side ventilation doors are the second version I have made, not perfect but it will have to do. The first version was made of quarter round where I put four of them together in an elecrical drill to round off the ends. Didn`t turn out very well as the variation was to big. I only have basic tools and a couple of electrical saws, which limits the possiblities to make consistant parts. Probably should have made this as 3D printed parts instead. I will come back to 3D printed parts for other bits later on in the build.

I have also started making the window "rubber seals" using quarter round styrene around the front and rear windows (not shown in the picture below). I glue a strip inside the window first and align the quarter round profile around it. The "seals" will be painted black by hand after the body has been painted orange, not ideal but with the aid of lots of masking tape it should be doable.

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The lamps will be made of brass parts sourced from a German shop with ship model parts. I found two parts that fit perfect, the port hole has a plastic part which acts as glass.
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In position. I think I will drill a hole in the side of the brass lamp to allow the leads to go directly through a hole in the housing side wall in this position. And then make the bracket for the lamp in styrene just for visual apperance, not gluing the lamp with the bracket to the housing at all for easier access if the LED needs to be replaced.
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The LED I have experimented with is maybe on the small side, but there is not very much space in the lamp when the porthole is in position. Maybe making the glass less translucent by buffing it down or adding a tape on the rear side will help.
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They say that the devil is in the detail and, may I say, that's a devilishly smart piece of workmanship!
 
The linked-to photo is not the prettiest piece of engineering is it?? ;)

I especially like the 'beware of hand-held vacuums' warning sign on the wagon!! ;) ;) ;D
-thumbnail below the ugly duckling..
 
What are you using for your scale drawings and where did you get them? My ability to work with plastic is not near the level of yours but I sure like to give this model a go. Your build is truly inspirational.
 
I use sketches from a series of books "Die Fahrzeuge der Rhätische Bahn", for this tractor volume 3. There are four volumes in total. The books are written by Finke & Schweers.

The sketches have no dimensions, so I use the total length and the total width and width between rails to determine the ratio between the drawings and the scale I am using (1:22,5). The accuracy of the sketches are not very good, and I have to supply with pictures to get the details better or at best correct.

There is also another book by Claude Jeanmaire called "Die elektrischen und Dieseltriebfahrzeuge Schweizerischer Eisenbahn - Rhätische Bahn: Stammnetz - Triebfahrzeuge" which has accurate drawings, but not for this tractor unfortunately.
 
Nice work Loco....
 
A lovely build, very clean and tidy, keep up the good work! The 3D designs are particularly nice too :)
 
Thanks all! The 3D model I have made is mainly targeted at building with styrene sheets and profiles. However, I haved modeled a few detail parts for 3D printing and will use Shapeways as provider for this very first attempt. I would love to be able to have a complete housing 3D printed, but before I can do that the price would have to come down a bit and I would also need to build up some experience with the required design for larger parts.

The image below shows the parts I will try this time: a couple of air filters and roof details
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The 3D printed details arrived today and I have to say the quality is good. The material is FUD (Fine Ultra Detail), high price but allows fine details. The surface is not super smooth, but I think it can be painted without sanding. The parts are printed with a wax support material which is melted away before delivery. But there is still some wax left on the surfaces which needs to be washed off before painting.

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