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Project: Masters for resin casting


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We are going to produce new locomotive kit of the Finnish prototype in H0 scale by using high quality 3D prints as master parts for resin casting. Hulls and bogie sides will made by using the resin casting and the fuel tank and smaller parts will made in white metal. There will be also many parts made in etched nickel silver. My point of view is that high quality 3D prints work excellent as master parts. Yes, they are also quite expensive — too expensive for making only one model, but suitable for using as masters in small series kits. I hope that someone might get ideas of our project.

 

Petri Sallinen

Helsinki, Finland

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Edited by Petri Sallinen
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Excellent work on the print. Where did you get such a high resolution 3d print done? And is that your own designed chassis?

 

Prints were made by ProtoLabs (ex-Fineline Prototyping) using SL-system (=Micro Fine Green). http://www.protolabs.com/fineline

 

The chassis is designed by Store Holmborg from Stockholm Sweden. He is the specialist for making chassis for small series kits using the CNC machine. Gearboxes are made in Delrin by milling — the chassis plate is 1 mm brass. It is very easy to work with Sture — we are able to send our 3D design to him and after that he is able to design the chassis using your drawing. Stures chassis are always ready-to-run.

 

We have made earlier some locomotive kits using the same idea. Here is one sample.

 

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  • 2 weeks later...

We have made earlier some locomotive kits using the same idea. Here is one sample.

 

52v9.jpg

Thats a really nice model!

Did you have to do any cleanup on the printed master? Any sanding of ridges/stepping fromthe layers?

 

And could you tell us a little more on the cost of the printed parts?

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The finish of your locos looks amazing!

 

Any cleanups, sanding etc. is not needed. There are also some smaller parts in our locomotive project, but I did not take photos of them — the price for all parts we needed was 1100 euros.

 

Could I clarify what you mean by this? Do you mean that the price for all the parts you need to build 1 loco was €1100? Or, do you mean that the price to set up production for many locos was €1100?

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Any cleanups, sanding etc. is not needed. There are also some smaller parts in our locomotive project, but I did not take photos of them — the price for all parts we needed was 1100 euros.

Thanks for the reply!

Does the RTV for the resin mould degrade or destroy the 3D-printed masters in any way, or can you make several RTV moulds from the same master?

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The finish of your locos looks amazing!

 

 

Could I clarify what you mean by this? Do you mean that the price for all the parts you need to build 1 loco was €1100? Or, do you mean that the price to set up production for many locos was €1100?

 

This is the price for parts of one locomotive, but we are using parts as master parts in resin casting — same idea when using CNC machine for making masters. This is too expensive technique for making only one model — we are making 100 kits when the cost of master printing will divide between the whole run. 

Edited by Petri Sallinen
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Thanks for the reply!

Does the RTV for the resin mould degrade or destroy the 3D-printed masters in any way, or can you make several RTV moulds from the same master?

 

No, the silicon rubber will not destroy the 3D printed masters — but only when you are using "cold cured" (=RTVs) rubbers. Prints are not suitable for using "warm cured" rubbers — like any plastics do not.

Edited by Petri Sallinen
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  • 3 weeks later...

Hi Petri, I need some advice on resin casting....Can I PM you for some tips please? It looks excellent. The 3D print quality is also spectacular.

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  • 5 months later...

We have got resin cast parts ready using the "green" 3D parts as masters. Rest parts of the model were etched in nickel silver and stainless steel. We have also built the first bodies ready — the chassis is still missing. The scale of our model is 1:87. Please enjoy my pictures.

 

Petri Sallinen

Helsinki, Finland

 

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Edited by Petri Sallinen
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  • 1 month later...

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