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don_jarr · 06-09-2007

Hi all

Crash93, I am currently adding a bit to my web site on it, so will give a shout when it’s done.

Jankers, I meet a lot of people that attempts at moulding are not coming out as clean as they want. The produce a really good prototype piece, but the casts from there mould are not coming out well. I don’t mean this in a spiteful or nasty way, but most of the time the mould is at fault due to the person doing it not understanding moulding properly. Post a couple of close up pictures of the prototype piece, and the mould, and a cast and I will try and point out what is wrong.

In the meantime a few pointers for a good clean cast.

Avoid very sharp edges. Just by sanding the edge to a slight round, will help stop air bubbles getting trapped.

Avoid sharp corners. Again just take the point off, and this helps stop air getting trapped.

Prior to making a mould try to make it in such a way, the resin can flow in, and the air out without any undercuts or air traps. Many people make something, and just mould it without thinking about the casting process.

Sometimes a multi piece mould will take longer to make, but give much better results, however try and make any joins on an edge or part it won’t show.

Choose your resin carefully with enough of a time gap to it gel’ing to make sure its all poured in and shook about.

As I said post a few pictures and I might be able to help.

Don

06-09-2007	#8 (permalink)
don_jarr Scale Model Member Join Date: Aug 2007 Location: Essex My Models: I never throw anything away. Visit don_jarr's Gallery Posts: 66 Images: 9	Hi all Crash93, I am currently adding a bit to my web site on it, so will give a shout when it’s done. Jankers, I meet a lot of people that attempts at moulding are not coming out as clean as they want. The produce a really good prototype piece, but the casts from there mould are not coming out well. I don’t mean this in a spiteful or nasty way, but most of the time the mould is at fault due to the person doing it not understanding moulding properly. Post a couple of close up pictures of the prototype piece, and the mould, and a cast and I will try and point out what is wrong. In the meantime a few pointers for a good clean cast. Avoid very sharp edges. Just by sanding the edge to a slight round, will help stop air bubbles getting trapped. Avoid sharp corners. Again just take the point off, and this helps stop air getting trapped. Prior to making a mould try to make it in such a way, the resin can flow in, and the air out without any undercuts or air traps. Many people make something, and just mould it without thinking about the casting process. Sometimes a multi piece mould will take longer to make, but give much better results, however try and make any joins on an edge or part it won’t show. Choose your resin carefully with enough of a time gap to it gel’ing to make sure its all poured in and shook about. As I said post a few pictures and I might be able to help. Don