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Offline Big AL  
#1 Posted : 16 November 2020 01:26:45(UTC)
Big AL

United Kingdom   
Joined: 25/10/2020(UTC)
Posts: 33
Location: Scotland, Glasgow
Started CAD modelling, still to finish the sides and the roof. I made a partially successful test print. I had partial bed adhesion.

Those handrail details (0.1mm) either side of the cab doors actually print on my Photon, however they are so small I fear paint will obscure them.

I split the Rokuhan SA-001 chassis so I could achieve the correct scale dimensions and proportions

Untitled.png

More CAD to do tomorrow, but I have been at it all day and I am going cross eyed. I think I will kick back, watch Space X Crew-1 launch while having some sipping whisky.
thanks 4 users liked this useful post by Big AL
Offline robfl  
#2 Posted : 16 November 2020 22:42:38(UTC)
robfl

United Kingdom   
Joined: 11/10/2020(UTC)
Posts: 7
Location: England, Warwickshire
Hi AL,
That looks interesting, very detailed.
How did you split the Rokuhan SA-001 chassis? Any pics. Does the chassis run on Marklin track and what voltage does it use.

Rob :)
Offline danmarklinman  
#3 Posted : 16 November 2020 23:10:26(UTC)
danmarklinman

United Kingdom   
Joined: 18/10/2012(UTC)
Posts: 1,175
This for Z?
Marklin and Piko era 4 SNCB , Marklin wagons
Wiking model car Fan
Faller fan including car system
Instagram: marklin1978
Wiking fan
Offline Big AL  
#4 Posted : 17 November 2020 00:37:03(UTC)
Big AL

United Kingdom   
Joined: 25/10/2020(UTC)
Posts: 33
Location: Scotland, Glasgow
IMG_0486.JPEG

The third print came out beautifully although it is very hard to tell from this potato quality image. White resin also obscures surface detail in photos because it turns into a white blur.

You will have to take my word for it the model came out perfectly. Every detail you see in the CAD model is represented in surface detail. The white dusty reside is from the evaporated Isopropanol but this has been cleaned off after this photo was taken earlier.

In this photo you can see a split and an unsplit Rokuhan chassis.

I have marked the split line in red. I also removed the top cover on the Rokuhan chassis.

It is Z Scale and it is correctly scaled and proportioned. The finished model is 62 mm in length, buffer to buffer. Each one of those squares on my cutting mat is 10mm

It ran pretty good on a bit of Marklin test track with a Maplins 9V PP9 battery until I broke the fine bare copper wire taking the chassis back out without paying due attention. I will replace those wires with some insulated wire later.

I have also designed a fuel tank that goes between the split bogeys which will reunite both parts of the chassis but I have not yet printed this.

I am very happy and it should paint up really well.
thanks 3 users liked this useful post by Big AL
Offline Big AL  
#5 Posted : 17 November 2020 00:40:45(UTC)
Big AL

United Kingdom   
Joined: 25/10/2020(UTC)
Posts: 33
Location: Scotland, Glasgow
This is the finished CAD model and fuel tank as a separate piece.

Untitled.png
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Offline DaleSchultz  
#6 Posted : 17 November 2020 01:18:33(UTC)
DaleSchultz

United States   
Joined: 10/02/2006(UTC)
Posts: 3,511
looks excellent! What CAD software are you using?
That is a lot of work!
Dale
Intellibox + own software, K-Track
My current layout: https://cabin-layout.mixmox.com
Arrival and Departure signs: https://remotesign.mixmox.com
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Offline Big AL  
#7 Posted : 17 November 2020 01:24:20(UTC)
Big AL

United Kingdom   
Joined: 25/10/2020(UTC)
Posts: 33
Location: Scotland, Glasgow
Thanks Dale, using Autodesk Fusion 360 for stuff like this, but I also use Blender and Meshmixer for other types of projects. It's about 8 hours of work so far just for the CAD.

Often I will do the hard surface modelling in Fusion 360, then export to Blender, remesh the tris to quads and do some sculpting or other detail that is not hard surface per se.
Offline robfl  
#8 Posted : 17 November 2020 23:11:14(UTC)
robfl

United Kingdom   
Joined: 11/10/2020(UTC)
Posts: 7
Location: England, Warwickshire
The printed body looks very good (I blew up the pic for a closer look). The tricky bit for me, would be painting it well, perhaps a simple design would work best.

Thanks for the pics of the Rokuhan chassis. The motor is surprisingly big, compared to a Marklin motor. I may get one myself, as I would like to have a shunter loco, but they are so expensive even secondhand on ebay. It would have to have a wooden body though, as I don't have a 3D printer. I'm pretty good with wood though :)
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Offline Big AL  
#9 Posted : 18 November 2020 01:37:02(UTC)
Big AL

United Kingdom   
Joined: 25/10/2020(UTC)
Posts: 33
Location: Scotland, Glasgow
You don't need your own printer, you could upload the model to Shapeways or another 3D printing service and have it printed and delivered to your doorstep. I priced the Class20 Shorty I also designed and I think it was less than a tenner to print in plastic or about 40 quid to print in brass if I recall correctly. I have publicly shared that model on Thingiverse where it can be downloaded for free. It clips onto the Rokuhan chassis without any modification at all. I painted mine with a Tamiya rattle can and it came out really good.

https://www.thingiverse.com/thing:4647674



Offline Big AL  
#10 Posted : 18 November 2020 14:33:01(UTC)
Big AL

United Kingdom   
Joined: 25/10/2020(UTC)
Posts: 33
Location: Scotland, Glasgow
Painting begins...

IMG_0496.JPEG

The little numbers are just laser printed on regular copy paper. Cut and applied to the model with some ModPodge on the end of a cocktail stick.

I might use this method for the other "decals" as this gives me the ability to print white.
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Offline robfl  
#11 Posted : 18 November 2020 23:28:24(UTC)
robfl

United Kingdom   
Joined: 11/10/2020(UTC)
Posts: 7
Location: England, Warwickshire
Thanks AL,
I didn't know you could get things 3D printed, I will have a go in wood, or possibly card, if that fails I might try your model.
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Offline Big AL  
#12 Posted : 19 November 2020 00:16:45(UTC)
Big AL

United Kingdom   
Joined: 25/10/2020(UTC)
Posts: 33
Location: Scotland, Glasgow
Shaky hand painting complete

IMG_0501.JPEG
thanks 3 users liked this useful post by Big AL
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