curved viaducts

[Philbahn]

Annieshalt mentioned at our opendaythat he wold like a viaduct, BUT, Curved. Only 900mm tall and only single track. Heres how I am approaching it.

19 mm MDF cut into the correct curve. Don't forget the outer radius is bigger than the inner.

Arround the curves 6 mm MDF 50mm wide pinned and glued to the formers

 

[Philbahn]

Next work out the radius of the arches this determines the next pice of wood height.
In this case 185mm rad so I got my MDF cut to 225mm and glued andd screwed this to the opposite side of the formergoing the opposite way

 

[Philbahn]

Because the viaduct is 180 degrees two inner and two outer formers like this were made. The middle of the former is 100mm wideand the returns on the top were 35mm wide pluss two layers of 6mm 182 mm over where the track will fit.

 

[Philbahn]

Legs next. Thought I would make them a bit thinner than on my viaduct.
They taper both ways 100 wide at the top tapering up to 125 at the bottomthis way a small tenon can be formed to key the legs into the top. The sides of the legs taper from 50 mm at the top to 75 mm at the bottom

 

[Philbahn]

A total of five legs were neededand spaced equi-distant to each other

 

[Philbahn]

Thats all so far just awaiting final measurements for width off Allan

 

[annieshalt]

dear phi , stopped raining, so final measurements are.

center of rail to opposite center of rail = 49 and3/8th inches.
the small straight in the center of the curve is, 2and1/4 inches.

hope this helps. ps the form work looks fantastic.

here i sit waiting in anticipation. now i need to find blue floodlights for it??????.

 

[CoggesRailway]

This great!! I look forward to seeing it continue- please keep the level of detail- i want attempt this at some point. How will the arches get formed?

 

[Philbahn]

At first I thought about cutting the arch in the side MDF but the arch expands as you go from the inner to outer. The latest plan is to fill the arches with foam. Four pieces 25 mm thick. The intricate biit is to sculpt the foam to shape.. Hoping thatit will stand laminating

 

[annieshalt]

you can always try plasticard phil , i know it will cost(argh) . i only hope i dont :blehass out at the bill!!!.

 

[trammayo]

Nice job!

Mick

 

[Philbahn]

you can always try plasticard phil , i know it will cost(argh) . i only hope i dont :blehass out at the bill!!!.

So far you are up to 200

 

[Philbahn]

you can always try plasticard phil , i know it will cost(argh) . i only hope i dont :blehass out at the bill!!!.

So far you are up to 200

Sorry forgot to add screws, thats 200 screws and a bottle of glue

 

[Philbahn]

Four layers of foam squeezed in

and ready for sanding

 

[Philbahn]

Any gaps to be filled in with decorators filler or similar filler

 

[Steve]

Brillaint Phil may i have a 6 foot straight one 9 " deep

 

[annieshalt]

i only hope the garden is big enough to hold all who want to come and run over a rad1 viaduct phil. been out today and gott more vitals in , barbie stuff, pies& non get drunk stuff for them who is driving 1.400 tea bags and anne will provide her home made stuff (yum yum ) pies quiche, curry, curled up sarnies etc, (guest of honour ) well lets see???,

 

[Philbahn]

i only hope the garden is big enough to hold all who want to come and run over a rad1 viaduct phil. been out today and gott more vitals in , barbie stuff, pies& non get drunk stuff for them who is driving 1.400 tea bags and anne will provide her home made stuff (yum yum ) pies quiche, curry, curled up sarnies etc, (guest of honour ) well lets see???,

Don't get too carried away it's only going to be seen by us few!!!!!!!!!!!!!

 

[Philbahn]

Well my bit is done now .Allan & Ann have just called and collected the formwork. Over to you Allan, we are expecting it to be done tomorrow. Don't forget to podge it.

 

[mike]

i only hope the garden is big enough to hold all who want to come and run over a rad1 viaduct phil. been out today and gott more vitals in , barbie stuff, pies& non get drunk stuff for them who is driving 1.400 tea bags and anne will provide her home made stuff (yum yum ) pies quiche, curry, curled up sarnies etc, (guest of honour ) well lets see???,

count me in please