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Ropley - 21st Century Modelling


TomE

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17042012-1.jpg

It's modelling Jim.......

 

Hi all.

 

Spurred on by WillJ's fantastic work in Google Sketchup with his various projects, but notably his PPM Class 139 & City of Truro boiler (Check out his blog here if you haven't already), I downloaded the program in order to get to grips with the program and allow me to make a start on the support for the ex Kings Cross footbridge currently being installed at Ropley.

 

Why do this in 3D? Well, the supports are actually quite complex for a simple footbridge, but coming from the London Terminal of one of the big four, I suppose it wasn't ever going to be a simple affair! The bottom third of the supports are octagon shapes of various different sizes then long circular section before reverting back to octagons. Even if you could get octagon shaped brass section, there are so many different changes in width & size it would be a nightmare to assemble, so really, this is one of those things that 3D printing is ideally suited too.

 

Google sketchup is a fairly simple 3D design program, and it didn't take long to get the hang of the basics. What you see above is the result of a couple of hours playing around, and whilst not entirely accurate, I was surprised how fast I was able to produce something quite close to the prototype. This won't be used for the prints, as until I visit Ropley again I have no idea about the actual dimensions of the supports, but I have discovered that working in 3D is not as daunting as I had long thought it would be and that footbrigde is now a little less scary!

 

Whilst the supports will be printed, the lattice railings and walkway will be etched, and thats another new technique I need to tackle!

 

Cheers,

 

Tom.

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Excellent, I notice you have already found the 'colour in' button too!

 

Any attempt at using Sketchup needs a simple task like this as an 'icebreaker'.. then you will fly as you realise it can do locomotives, griddle cars.... etc!

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  • RMweb Gold

A good start...and another 'green' element for the layout :D

 

I dabbled with Sketch-up before Christmas for work use and by the end of an afternoon I had draw the new house we were working on in 3D and exported it to sit on the proposed site in Senegal...a great package...and I should look to use it more...

 

You have decided to include the footbridge as part of your context now then?

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  • RMweb Gold

Excellent, I notice you have already found the 'colour in' button too!Any attempt at using Sketchup needs a simple task like this as an 'icebreaker'.. then you will fly as you realise it can do locomotives, griddle cars.... etc!

 

One step at a time I think Will! Although I might be tempted to have a go at some Griddle car sides once I've fully got the hang of it!

 

You have decided to include the footbridge as part of your context now then?

 

Thanks Pete.

 

I am going to include the bridge. I think it will very quickly become a key feature of the location and it also quite a nice feature to model!

 

Cheers,

 

Tom.

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Great work there. Once I get a computer with a functioning graphics card I am going to get seriously into 3D design!

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  • RMweb Gold

Thanks Stephen!

 

I'd never done any CAD work before the column above and if I can do it, then anyone can!! Google Sketchup seems more than adequate for simple things like this too, rather than having to learn a more complex program :)

 

Tom.

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Tom,

 

Like you I have never done any 3D drawing work before. The only experience I have of even 2D drawing goes back an 'O' level in Technical Drawing 30 odd years ago!

 

However, I do find SketchUp an easy tool to master, and find that the ability to enter the size of an item manually really helps.

 

For example if I want a cuboid of 0.2mm x 0.6mm x 0.15mm, I would choose the rectangle tool to draw a rectangle of any size, then type "0.2mm,0.6mm<RETURN>", this can then be push/pulled to the depth of 0.15mm by pulling to say 0.3mm, then typing "0.15mm<RETURN>" which will reset the manually pulled depth to the entered figure (SketchUp doesn't unfortunately allow (unless someone knows different) setting the "snap" to a finer resolution than 0.1mm).

 

Ian

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  • RMweb Gold

Thanks for that Ian. Scaling was the next thing to figure out, and along with a useful video that Will sent, it looks like it won't be too difficult. I just need to get the dimensions for the actual bridge now!

 

Tom.

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