Jump to content

N scale London Underground 1995 stock


Recommended Posts

Thanks Kris. I used the free version of Sketchup, plus two programs recommended by Shapeways for file conversion - Meshlab and Accutrans - and Netfabb as recommended by BobD for error correction.

 

Paul

Link to post
Share on other sites

Thanks for the info Paul. Seeing what you have done, and the costings, has inspired me to have a play myself, whether I ever get to the printing stage is another matter though.

Link to post
Share on other sites
  • 1 month later...

Thanks for that link Jack, it's an interesting idea. In the end I scaled the model down from full size using Accutrans.

 

The driving car arrived by courier this morning and it's a lovely little model.

 

 

P6290072.JPG

 

All the detail has come out as expected, and the surface is very smooth even on the curves.

 

P6290071.JPG

 

It needs some careful cleaning of the remaining yellow waxy residue though. A bit of light sanding and a few fine coats of primer should also improve it further.

 

P6290073.JPG

 

The chassis slightly resembles a banana, but the body is very rigid so when the two are together everything should be fine. I might putting it in warm water and gently bending back to shape too.

 

P6290078.JPG

 

One of the bogie sides is a bit yellow, but otherwise they have come out fine.

 

Now I can get on with finishing and painting this car, and finishing the design for the intermediate vehicles.

 

Paul

  • Like 2
Link to post
Share on other sites

If you have access to an ultrasonic cleaner it removes the yellow wax completely.

 

I have one of those, I will have to try some of my FUD bits and see how they clean up.

Link to post
Share on other sites

That looks cracking!

 

I hope not!;)

Handle with care,Paul.The material isn't as tough as WSF and can crack.

I look forward to some close up photos of the painted model.Looking good so far.

Link to post
Share on other sites

Thanks all for your kind comments.

David, the CAD files are safely backed up on a steel-cased external hard drive - I'm not taking any chances. The computer I use for CAD work is currently having its screen replaced, but as soon as I get it back I'll upload the intermediate car and make both it and the driving car available to order from Shapeways.

I'm also planning to modify the CAD model to make it suitable for OO scale if anyone is interested in a larger version.

 

Paul

Link to post
Share on other sites

as soon as I get it back I'll upload the intermediate car and make both it and the driving car available to order from Shapeways.

 

Excellent news - thanks for doing that Paul.

 

Cheers, Mike

Link to post
Share on other sites

I've now given the model a careful clean with acetone, which has removed the remaining yellow wax from the printing process and exposed some of the detail which was previously hidden.

 

P6300088.JPG

 

P6300080.JPG

 

P6300093.JPG

 

It now needs some careful sanding with fine grade sandpaper, alternating with thin coats of primer, to get a good smooth finish.

 

Paul

  • Like 2
Link to post
Share on other sites

Thanks Stadman.

 

 

When I first tried to fit the body over the chassis they were a bit tight and I didn't want to force them together in case they broke - or got stuck. Having given the chassis and inside of the body a going-over with fine sandpaper, I've now successfully tested the two parts together. I did think I'd have to use small screws to hold them together, but the fit is sufficiently tight that I don't think that will be necessary.

 

P7010100.JPG

 

Paul

  • Like 5
Link to post
Share on other sites

Yes, the chassis is bent but fairly flexible, while the body is very stiff and the fit between the two is tight enough to hold them firmly together. So the chassis straightened out and stayed straight when the two were fitted together.

 

Paul

Link to post
Share on other sites
  • 2 weeks later...

As well as working on the first printed driving car, I've also been making some changes to the CAD model to incorporate some improvements. I wasn't happy with the underframe details, but couldn't find any good photos of it on the net, so I took a ride to Edgeware to take some of my own. Using them I have been able to increase the accuracy and detail quite considerably.

 

Before

northern%25252095ts%252520model%25252036%252520complete%252520driving%252520car.jpg

 

 

 

After

northern%25252095ts%252520model%25252050%252520driving%252520car.jpg northern%25252095ts%252520model%25252050%252520driving%252520car%2525202.jpg

 

 

Other modifications to the design have been made to improve the fit between the chassis and body, strengthen some vulnerable parts, and allow more space for the bogie to rotate in. I have also been working on the CAD models for the intermediate cars. The whole lot should hopefully be available to order on Shapeways within a couple of days.

 

Paul

 

  • Like 3
Link to post
Share on other sites

This looks very good Paul, well done. I await some pix when you have undercoated it to see how the detail comes out as from the see-throughness of the model it is hard to tell the quality of the printing. Keep up the good work and look forward to seeing more of your work.

Tom

Link to post
Share on other sites

Thanks Tom. I've got a couple of coats of paint on now, still several more and lots of sanding to go. I think I'll also need to use a scalpel to remove a bit of paint from some of the details where they have become slightly clogged.

 

P7140022b.jpg

 

 

P7140014b.jpg

 

 

P7140010.JPG

 

 

I have also tested assembly of the trailing bogie. The fit between the sides and centre was a bit sloppy so I have tightened it up on the design, as well as reducing the thickness of the bogie sides to improve clearances.

 

P7140020b.jpg

 

 

With modifications to the design and design of the intermediate cars now complete, I have made the 95 stock models available to order from Shapeways. There are three vehicles, the driving motor, the trailer car, and the uncoupling non-driving motor. Each includes the body, chassis, and bogie parts. The driving motor and uncoupling non-driving motor are available in two versions, one unpowered with parts for two trailing bogies, and one designed to be powered with a Kato Portram bogie, with parts for one trailing bogie and sideframes only for the power bogie.

They can be ordered from my shop on the Shapeways site http://www.shapeways.com/shops/amr (link posted with permission of Andy Y).

 

Paul

  • Like 2
Link to post
Share on other sites

Hi Paul,

 

This looks excellent! - I have one question though.

 

Can a Tomytec Portram chassis be substituted for the Kato one? They are substantially cheaper than the Kato (at least the ones I've seen), which makes buying a new model just for the bogie a bit easier to justify on my wallet :D

 

Martin

Link to post
Share on other sites

The design of the Kato and Tomytec chassis are completely different.

 

The Kato one is a motor bogie and Tomytec has a full size motor with cardan shafts and takes up most of the body of the tram.

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.