| Silicone Moulds Making - Guns Casting |
| Written by Jerzy Bin | ||||||||||
| Wednesday, 11 April 2007 | ||||||||||
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Model building reality requires to prepare number of gun barrels for my galleon Wodnik. So time came to cast them! Final material that will be used for casting has not been chosen yet i.e. it will be either polyester resin or tin alloy.
Using kids blocks I built small forming box around 15 x 10 cm of inside dimensions. I place original brass barrel in the form as show on the picture supporting it with nail stuck inside the barrel and cone plastic support cut out from old super glue tube. Both supports are squeezed into pieces of plasticine. Another method the form making would be actually to fill half of the box fully with plasticine and simply squeeze the barrel into the material.
After addition of the catalyst chemical reaction will produce quite a bit of air bubbles which are your worst enemies when building a form and casting later. To reduce the air and to suck out as much as possible it is advised to place the freshly mixed silicone in vacuum container.
This is it for Day 1. We leave the mould for 24 hrours to settle properly.
Day2 - out of plasticine we make de-airing channels and one bigger hole which will be used to pour in casting material. I stuck in four corners wooden dowels that will help me to fix correctly both parts of the form.
So two days later we can open the form. It looks great, no single air bubble in the mould where it should not be there. Now the form has to season for 3-4 days. And then I will proceed with the casting.
To be continued.
Small movie from actual casting!
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| Last Updated ( Sunday, 23 December 2007 ) | ||||||||||
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