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Your Layout and Models => 3D Modelling => Topic started by: nosomosnada on February 22, 2012, 02:55:33 PM

Title: My first 3d experiment
Post by: nosomosnada on February 22, 2012, 02:55:33 PM
Well, this is the result of my first attempt of 3d printing.

Although I was actually interested in buildings, I've decided to start for something smaller (and cheaper, of course), and this is what I've got some minutes ago when I've opened the box that I've just received from UPS...

It's an all third class coach of S&DRJ and I've modelled chassis, body and roof in different parts, and wheels, of course.

(http://img851.imageshack.us/img851/4880/generald.jpg) (http://imageshack.us/photo/my-images/851/generald.jpg/)

(http://img841.imageshack.us/img841/3074/chasissn.jpg) (http://imageshack.us/photo/my-images/841/chasissn.jpg/)


As the material is translucent, the details of the coach does not distinguish very well, but at first glance, I'm pretty happy with the result.


Title: Re: My first 3d experiment
Post by: EtchedPixels on February 22, 2012, 03:20:03 PM
Looks good - will make a fine ghost train in its current form!

Doing the wheels is interesting but I'm curious how they will wear around the bearings . The Peco plastic wheels are a very hard plastic.

How smooth does the roof seem to be ?

Alan
Title: Re: My first 3d experiment
Post by: Tank on February 22, 2012, 03:25:14 PM
That looks superb to me.   :thumbsup:  Well done.

Looks good - will make a fine ghost train in its current form!

I agree there! ;D
Title: Re: My first 3d experiment
Post by: Newportnobby on February 22, 2012, 05:14:34 PM
Very good work :thumbsup:
Title: Re: My first 3d experiment
Post by: Alex on February 22, 2012, 05:39:30 PM
Very nice. :thumbsup:
Title: Re: My first 3d experiment
Post by: polo2k on February 22, 2012, 07:04:04 PM
I would have a go at doing a 4 wheeler, they are like hot cakes on ebay
Title: Re: My first 3d experiment
Post by: Stevie DC on February 22, 2012, 08:21:41 PM
Wow that looks really good! I'll have to echo comments about the wheels though, I'm not sure they'll stand up to everyday running.

I've been thinking about something similar for some GNR four wheel stock to make up a short rake - too many other project to think about at the moment!
Title: Re: My first 3d experiment
Post by: Southernboy on February 22, 2012, 09:23:33 PM
That's really very impressive :)

I've had a similar (yet completely different!) little project at the back of my mind for some while - do you mind if I ask how difficult / straightforward the process was? Did you have to draw plans yourself or did you just send off some photographs for someone else to do the line work? And would it be rude to ask how much you paid?

Title: Re: My first 3d experiment
Post by: nosomosnada on February 22, 2012, 09:48:15 PM
A few images more... but it's very difficult to take a good photo of a 'ghost train'  ;D

This is the roof and surface it's quite smooth. It fits into inner walls of body pretty tight, so there is no need of glue to keep fixed to the body. I was thinking about modelling seats, but I've left for later. Windows are small and I think that the interior will be no significant.

(http://img690.imageshack.us/img690/1380/techon.jpg)
By n0somosnada (http://profile.imageshack.us/user/n0somosnada) at 2012-02-22

In contrast, the sides of the body are very rough and level detail is a bit disappointing. Panelling in relief is visible but gap between doors is lost.

I think that orientation of the object inside the machine is determinant, because roof surface and floor of body are quite smooth, but left, right, front and back sides of body are very rough.

Next image is a detail of 3 link couplings. I hate NEM couplings so I've modelled only the 'scale' hook... but I have to test a NEM support for a new version of the chassis.

And the piece next to the coach is the brake system (brake blocks and push rods) that have decided to go for a walk far from it's original position attached to the vacuum cylinder on the chassis >:(... 

That shows how fragile is a 0,5mm diameter bar made of FUD...

(http://img816.imageshack.us/img816/8610/img1691s.jpg)
By n0somosnada (http://profile.imageshack.us/user/n0somosnada) at 2012-02-22

And finally, this strange piece is a 'test sprue', including 3 link couplings, hooks 0,6mm thickness (hooks in chassis are 0,8mm width) in case of original get lost and a pair of vacuum brake hose.

(http://img138.imageshack.us/img138/9715/img1692ct.jpg)
By n0somosnada (http://profile.imageshack.us/user/n0somosnada) at 2012-02-22

About the wheels, I decided first to model from prototype measures, but finally I've taken measures from graham farish MKI wheels, that are roughly the same size.

I must say that I'm impressed with the ease of rolling  ('impressed' is a way of meaning that I was expecting to get a coach rolling with the ease of a brick...). It's not as good as a RTR model with metal wheels, but with a bit of Peco lube, it's enough for me.

A this moment, I haven't been capable of fitting farish wheels in the chassis, because I've modelled holes too much tight, but I'll try again for a new version.

Well, I've been dealing with 3d modelling for the last 16 years... and I must say that this is the funniest thing that I've ver made!!!
Title: Re: My first 3d experiment
Post by: nosomosnada on February 22, 2012, 10:39:44 PM
That's really very impressive :)

I've had a similar (yet completely different!) little project at the back of my mind for some while - do you mind if I ask how difficult / straightforward the process was? Did you have to draw plans yourself or did you just send off some photographs for someone else to do the line work? And would it be rude to ask how much you paid?

I've used some S&DJR coach drawings I've found in second hand old railway model magazines and reference material that I've found about 4 wheelers in some books and internet.

I've got no problem with 3d modelling, of course, so the most difficult task of the whole process for me is taking decisions about about wall thickness and amount of detailing, wondering if that little rivet it's enough important to try to get printed in the finished model, if it deserves to be oversized a bit to be sure that it will be there or if it may be let go from the model and the results will be the same...

So I've made all the work... and I've spent around 60 hours (half drawing, and half fixing stl files... the most boring task) and finally I've paid me with a wonderful 4-wheeler for my layout  ;D
Title: Re: My first 3d experiment
Post by: moogle on February 23, 2012, 01:02:57 PM
Well done that man!
Its hard to do in FUD, I tried and it went wobbley...  ::)  :smiley-laughing:
Looks good it does. I know what you mean about missing lines out between doors.
Think there's a bit on the Shapeways site about orienteering your models for smoothness.
So whats next? Painted versions on Ebay for 'bargain' prices?  ;)  ;D
Title: Re: My first 3d experiment
Post by: EtchedPixels on February 23, 2012, 02:03:59 PM
For FUD the advice I've seen is that because of the way the FUD process works you get rough surfaces wherever you have supporting material. I'm planning to test this at some point by printing a coach like the traditional plastic kits so a pair of printed sides ends and roof all facing the same way so the support should hopefully be on the inside. Trouble is Shapeways don't guarantee orientation unlike some of the other printer houses.
Title: Re: My first 3d experiment
Post by: Zaonite on February 23, 2012, 03:55:15 PM
Holy moly!

I might have to see what this 3D printing stuff is like!

How much does it cost to get set up?
Title: Re: My first 3d experiment
Post by: EtchedPixels on February 23, 2012, 04:17:27 PM
Holy moly!

I might have to see what this 3D printing stuff is like!

How much does it cost to get set up?


Start at http://www.shapeways.com (http://www.shapeways.com)

Setup is about nil - printing cost is a bit more !
Title: Re: My first 3d experiment
Post by: Zaonite on February 27, 2012, 09:43:53 PM
@ EtchedPixels and nosomosnada

What software do you use for your 3D designs?
Title: Re: My first 3d experiment
Post by: EtchedPixels on February 27, 2012, 09:53:28 PM
@ EtchedPixels and nosomosnada

What software do you use for your 3D designs?

The motor block is entirely done in OpenSCAD. That's a rather different approach to CAD than drawing type tools - its basically a programmatic approach and as a programmer suits me better than macdinking.

Some of my other bits I'm actually writing apps to do the work and feed into things like OpenSCAD to do the generation of the object. It's how I do some of the 2D stuff as well - easier IMHO to teach a computer to draw Stanier coach sides than do them by hand. That's after all what they are for !

Alan
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