On18 Trestle – Pt II

Seat Support – Augmented
seatsupport3Sat down and used my On18 track (Peco HOn30) to get some measurements. With that and need for extended ties for a walk support etc. etc. I pretty much finalized the plan.
seatsupport4Expanded so the parts can be seen. Need to get some 1/8″ material for the ties (if I don’t have any) and the larger piece needed for the ‘pesudo ties’ and I will be set.
Seat Jig
seat_height_jigI am going to screw/glue a piece of wood I call the ‘Seat support” to the abutment support. The upper surface will be the actual seat with the abutment formed around that. Since it is important that this be at an exact distance from the top of the abutment (when the seat timber, stringers, ties and rail all stack up, the top of the rails need to match the top of the rails for the track on either side).

To make this easier I created this simple jig. It will sit on the top of the abutment/wall notched so the leg extends .535 in. That will enable me to place the seat exactly the right distance down from the top.

seat_height_jig2.. and the Seat Support screwed and glued.

Tomorrow I will probably remove the screws. Next step is to apply a plaster veneer make a shell from Sintra® to create the abutment. This one will be quite short since the cliff supports everything. The one on the opposite side will be somewhat larger (between somewhat and much).

Mocking up Abutment
abutment_mockingWith the left side abutment shell made from Sintra® I could prop it in place on some foam. The shell is three sided so it slips over the abutment seats glued earlier. I just have put the foam in the general location I’m thinking for a land-form there.

The abutment itself is still rough. I applied a skim of bondo – sanded and a thick application of gray primer. This will end up looking like concrete poured into a form (I hope)

Roughing Scenery
roughing_sceneryI made up my own mix of a ‘ground goop’. I just grabbed what I had on hand .. about equal proportions of plaster of paris, white glue, CelluClay and Oil Absorbent. I then schmeered it over everything and let it dry – after which I will cover everything with my ground color (the yellow in the photo).
Fitting left abutment
fitting_left_abutmentIn the “real world” the abutment is usually fit to the environment. Loose rock and dirt is removed until they reach bedrock – that sort of thing. Here .. I’m doing it pretty much in reverse. I am cutting away the foam until the abutment fits nicely. I can come back then and finish bringing the rock up to meet it.

This way .. when I am happy with the look of the rock around the abutment, I can take that abutment – which is just a three sided shell .. to my workbench and have a lot more control over texturing, weathering and so on there at the workbench then I would have if I was trying to do that on the layout.

fitting_left_abutment2With some plastic wrap to protect the abutment shell I put it where I had it in the photo above and then squished in some ground goop. I also pushed in a couple pieces of old plaster castings I had laying around – they may stay .. might get carved or removed later.

In any case this gives a good, neat structure to work with. Pushing the goop in and around the plastic wrap covered abutment shell makes it fit nicely. The worst part of this .. as it is many times in modeling is waiting for the darn thing to dry.

I pulled the plastic wrapped abutment (sic wrapper) out of what is essentially a mold so it can get air and dry faster/better.



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