Making a mould and casting a resin copy

[Pascal]

Hi guys,

 

I broke one of the wheels of my 1/18 UT Models Porsche 911 GT1. I have a wheel insert from S.M.S., that I want to use to make a rubber mould.

 

Do you think it's possible to make a mould with this insert ? And can you explain how to do it ? :

 

 

 

Any help and tips are welcome.

 

Sincerely

 

Pascal

[JCH]

Sorry, no help here but I WILL be watching with interest.  😯

[Black Knight]

Basics;

1. pack the inside carefully with plasticene. Up to the level of the back sides of the spokes, or level with the front sides of the spokes

2. place on a bed of plasticene. 

3. make a wall around that bed. I use Lego

4. pour silicone RTV rubber over it all.

5 when that is set turn over and remove plasticene

6. apply mould release wax

7. pour on RTV rubber

8. when set remove the walls

9 separate the two halves of the moulds

10 use a scalpel to cut pouring gate in the rubber down to the wheel rim.

11. cast copy using polyurethane resin.

[bootneck]

There's a nice, simplistic, practical video on the Sylmasta site.  Select the video and view full screen.  I would recommend that you make the original as good as possible, before making a mould, as any imperfections will end up in the casting.  I am referring to the ejection marks on those rims. unless they are meant to be there.

 

Mike

[klubman01]

The Sylmasta video is very clear.  Their resin casting kit is also very good, and I've used it to make castings from a white metal master.  

 

A word of warning, though.  Don't be in too much of a rush to get the castings from the mould.  Although the resin may appear to have cured, it can still be soft and pliable, so handle with care.

[Steve Noble]

I've used the Sylmasta kit a few times and it is very good. I made some wheels for a Tamiya Escort Cosworth and also a steering wheel and left hand drive dashboard for a Hasegawa Mitsubishi Lancer rally car. They turned out very nicely. Only problem I had was the occasional air bubbles in the wheel castings, but other than that it was fine.