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Post by TheMOMH on Jan 26, 2005 14:18:58 GMT
I've had a bit of trouble when casting with little pits appearing on the surface of the casting, giving it a bumpy appearance, instead of the smooth look I'm trying to get (I'm casting the PA staunton chess mold, incase it makes a difference)
I'm using some talc to dust the mold with, am I using too much, or not enough, or is something else wrong?
Thanks, TheMOMH
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Post by Prince August on Jan 27, 2005 9:58:49 GMT
I've had a bit of trouble when casting with little pits appearing on the surface of the casting, giving it a bumpy appearance, instead of the smooth look I'm trying to get (I'm casting the PA staunton chess mold, incase it makes a difference) I'm using some talc to dust the mold with, am I using too much, or not enough, or is something else wrong? Thanks, TheMOMH Your mould may be damp. The moisture then leaves little pits as it evaporates. Warm the mould in an oven gently. (Warm not toast) When bone dry try again. Also make sure you are not OVER heating the metal, that could cause problems. Keep the flow even and use a match to keep the slag from entering the mould. Have you followed our tutorials in casting. They cover all this. Talc should be added evenly and the two sides of the moulds tapped together to remove any excess. There is no need for too much as this can block the flow as well. Let us know if this advice helps. Best of luck.
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Post by luftys on Feb 28, 2005 21:28:27 GMT
wat metal are you using?
If you first cast come out pitted,try another 1 but with out talc
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Post by johnack on Apr 18, 2006 8:44:21 GMT
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carl
PA Lieutenant
Posts: 84
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Post by carl on Jun 21, 2006 2:02:57 GMT
Hi, I have now purchased a RTV silicone rubber mould kit and I am going to have go at making my own moulds. John You must have lots of spare time on your hands. I'd rather let PA do all the hard work. However, keep us informed. You may become the next PA.
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