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Octel 1957 Chlorine Tank - Part 2


D869

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A quick progress update on the Chlorine tank. The end stanchions have now been persuaded to go together and have been attached to the chassis, as has the brakegear.

 

This of course also means that I can now try the tank in place along with some of the timber packing that goes underneath the tank and at the ends. The tank still needs a good clean out to get rid of the residual wax.

 

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The good thing about 3d printing is that it's a piece of cake to create the domed tank end and then subtract exactly the same shape from the timber packing so the two fit perfectly together. I also created a 'test' model in the 3d tool (OpenSCAD) so that I could import the outlines from the drawings for some of the main etched bits and check that the 3d and etched bits would actually fit together and get a rough idea what it would look like. The nice thing (if you're a programmer, like me) about OpenSCAD is that it's basically just programming, so it's easy to stick in a few 'if' statements and use the same model both as a 'preview' test like this and also to lay out everything with sprues etc ready to upload to Shapeways.

 

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As with the D600 bogies, I also did a scaled up mockup of the etches in card. This particular mockup is still mostly just a pile of bits of card but it did its job of checking that the main chassis bits would fit together and that the fold lines were in the right place.

 

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Hi Andy.

 

It was good to have a chat at RMweb Live on Saturday. The tank is looking great, the photos above not really doing it justice! The method you have used for getting thin edges to the sole bar has really paid off. 

 

The square post signal was very impressive too, despite the, erm......."challenging" angle the balance weight mounting would need to be ;) 

 

Tom. 

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Card mock ups. There's a great idea. If you pasted the whole thing in shellac once you finished you wouldn't need an etch?

You're just confirming my view that etched kits are a grown up version of the sort of cardboard cutout stuff with tabs that we used to get on the backs of cereal packets.

 

 

It was good to have a chat at RMweb Live on Saturday. The tank is looking great, the photos above not really doing it justice! The method you have used for getting thin edges to the sole bar has really paid off.

Likewise Tom. Ropley is looking good too.

 

The square post signal was very impressive too, despite the, erm......."challenging" angle the balance weight mounting would need to be ;)

Yep. The moral of the story is... don't draw etching artwork on the train home after a day working in London... although if I hadn't been doing artwork on the train I'd probably still be doing it now.
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