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You've Been Tangoed - GWR Modelling Cliché No. 1 - Part 1


richbrummitt

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After an offer to Rabs of a file to try on his (then new) printer rather a lot of time passed and after an almost near miss with the postal service a little package arrived through the door recently with a bright orange one of these in it.

 

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The detail is comparable to some of the finest stereolithography that I have witnessed from professional bureaus. I know Rabs has spent quite a lot of time tweaking and practicing, refining the machine and the process and it has been worthwhile. The next picture shows a close up.

 

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The stepping is visible but was quickly cleaned up with some small fine sanding sticks over the course of an evening, trying to avoid destroying the rivet detail. They were all there in the CAD file :yes: The upper end was the worst but being the end it will usually be less visible than the sides and I think it will be okay but not perfect once painted now I've smoothed it out. Under 9x magnification the rivets seem to have distorted here but they are barely visible to the naked eye at 2'.

 

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The resin is supposed to have similar properties to some injection moulded plastics. (I didn't ask which ones, because it isn't important to me, sorry.) It is a little brittle and I have lost one of the buffer housings already, along with a small amount of the headstock. This, I suspect, is due to the very thin wall thicknesses. I don't know what I was thinking when I modelled them because I can't use the buffer housings that remain: this type are too small to drill such that they will accept a shank and head when the shank is 0.5mm. It will be back to brass for the buffers in due course, and I have some small repairs to make.

 

I had considered using this as a master for resin casting a few more of these but there were never many of them built and their size meant they were not very useful except for bulk volumes of traffic, which were often conveyed between major traffic centres under darkness. They would be great for anyone craving a 47xx that gets one. Except for that they are a bit of a GWR modelling cliché. At least my model of a branch line isn't a terminus ;)

 

So for the moment I'm continuing on as a one-off. I have built the bogies up to check the buffer height and having used nearly all the packing pieces on the bogie etch it's looking pretty good so far.

 

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The GPV at the right hand side shows quite clearly why you can't produce one of these from two iron mink kits.

 

To be continued...

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The last picture should come up plenty big enough to see the rivets if you click on it because it's wider than my QHD+ display.

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  • RMweb Gold

Looks good Rich. The GWR is often thought of as Branch lines by modellers but as a boy I saw a lot of freight on the slow lines from Reading towards Paddington.

Don

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  • RMweb Gold

Hi Richard, this technology is certainly moving forward quickly. Looks great.

 

I wrote something a bit flippant about GWR clich

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  • RMweb Gold

Hi Rich

I like the bogie van nice to see how they made 4mm modellers would like one of those to replace the big old lump of a cast kit.

Seeing those bare roofs have you ever consided using a strip from a plastic venetian blind the latest ones about are just the right size for 2mm, I done some mods to some peco kits years ago for my brother in law with some it turned out well.

Bob

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I can scale the model for 4mm quite easily. You might need some more details around the door area to better define the hasp, lock and hinges but otherwise it should be good. There are location holes for the bogies and what not though. Presumably there is a source for 5'6" plate bogies of the right type? I'd need convincing to spend a few hours to get it uploaded and through the Shapeways acceptance nightmare for people to be able to buy it. What would be ideal is to find someone who had the knowledge and interest to resin cast it for a sensible sum (read what modellers might be prepared to pay for it) without taking up much of my time. The latter could apply to 2mm too.

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Very nice Rich (and Rabs).  A first glance at the 3rd photo and I thought you'd given it a planked end :-)  I assume it's just minimal stepping from the orientation Rabs gave it when printing it.

 

Look forward to seeing it complete.

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Yes, very minimal, and a function of the layer height. Perhaps better results could be obtained by printing the sides flat and assembling - much like a plastic kit - but that kind of defeats the object?

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Just saw this. Glad you're happy with it.  A van like this with sheet metal sides is probably about the hardest thing to print because any warping or stepping is immediately obvious - if anything I think that the beetle came out better.

 

When I said similar to injection moulded plastics I was thinking HIPS and I only meant in terms of stiffness.  In fracture toughness the resin is far worse than any thermoplastic, I'm still trying to make up my mind if it is good enough or not.

 

Have you painted it yet?  How did it come out?

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A van like this with sheet metal sides is probably about the hardest thing to print because any warping or stepping is immediately obvious.

 

Agreed.

 

 

I'm still trying to make up my mind if it is good enough or not.

 

I'm still undecided too. Not yet is still my current stance.

 

 

Have you painted it yet?  How did it come out?

 

The answer to this one is also not yet. It does have a roof though so I must have done some modelling since March!

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