Scratch-building CN’s 40′ Wood End Bunker Reefers PT:3 [Fabricating Fishbelly Centre Sills and Z-Bracing]

After a brief break from the CNR Wood Reefer project, this weekend seemed like a good opportunity to get back to it; with the recommended social distancing and all. Might as well use a not-so-good situation to have some fun at least, right?

The next thing I needed before proceeding with the underframe of the car was Z-Bracing. The general arrangement drawings show two lengths of Z-bracing running end to end of the car. The problem I faced here was that Evergreen does not make Z-angle small enough, but I didn’t want to mail it in and use just a plain old strip in place of the Z-angle.

Luckily, while cruising around the internet looking for pictures of scratch-built fishbelly centre sills I happened across Chris van der Heide’s blog. Lone behold Chris had run into the same problem as me at one point and took the time to detail how he fabricated and used a jig to create his own Z-Angle stock in this post. I decided that this is how I would proceed.

The jig was not at all hard to make and the process of feeding the three strips of styrene (HO scale 1×3″ on the top and bottom and 1×2″ as the web) through the jig was made easier by brushing a little bit of powdered graphite into the hole as a lubricant.

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The final product.

As you can see the finished product is just as good as anything you could buy on the market. Thanks for your help Chris even though you may not know you helped! LOL. Make sure you check out his blog post for a better explanation of how this was done.

With the Z-Bracing out of the way the other major component needed for the underframe was the fish belly centre sill.

First, I used the scaled-down general arrangement plans as a guide to drawing the general shape of the sill plates in TinkerCad. Then, I used my Cricut Maker to cut the fish belly sill plates out of .030″ sheet styrene. The great advantage to using the Cricut for this purpose is that all of the sill plates will be accurate and of the identical measurement. One disadvantage is the cutter does create a bit of a burr around the cut but it is easily cleaned up by carefully using a single edge razor blade to slice it off. The Cricut Maker is an amazing machine and deserves a post of its own. I see a lot of potential for this machine in the hobby of model railroading…

After the sill plates were cut and cleaned up I added 1×6″ Strip to the bottom of the plates by pushing the strip and plate against 1-2-3 blocks and gluing them together. Then, I added 1×4″ strip to the top of the plate as well as 1×3″ along the bottom of the plate where it meets with the 1×6″ strip.

After all of the sill plates were built, I glued the tops of them to a piece of 2×12″ strip to create two full fish belly sill assemblies- one for each car. When the glue dried, I wedged strips of 2×12″ styrene vertically between the plates to prevent them from warping inwards. I trued the edges up with my NWSL true sander.IMG_1327.jpeg

One of two completed fishbelly centre sill assemblies.

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While the fishbelly isn’t glued to the car floor in this photo, this shows how it will look attached to the car.

I’m very pleased with how the fish bellies turned out. Once they are glued to the model a strip of 1×3″ strip will be glued against the car floor and the side of the sill plates to create an “L” channel with the 1×4″ plate on the sill.

I will use MicroMark surface decals for the rivets and I’ll likely apply them to the sill before gluing it to the cars (with the exception of along the previously mentioned 1×4″ strip.)

Next time I will glue the centre sills onto the car floor, install the z bracing and fabricate and install the cross ties/cross-bearers. After that, it will be time to install the underslung heaters and install the brake rigging (my favourite!).

[Worth noting: the underslung heater may become a project in its self, 3D printed part which may end up being molded and cast as a precaution- I don’t entirely trust the chemical stability behind Shapeways’ Fine Detail Plastic. We’ll see.]

Thanks for reading,

CM

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