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The Water Cooler
General Discussion
Casting - Sand mold Materials
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<blockquote data-quote="Larry Morgan" data-source="post: 1462055" data-attributes="member: 4676"><p>Mixing casting sand is a fine art. It's easy to get it too wet. You want to use bentonite, as already mentioned, with fine sand. Then you slowly start adding water. Unless you have a machine, mixing is tedious. The bentonite will instantly absorb the water and clump, so you have to mix it and condition it until it's nice and smooth. </p><p></p><p>If you get it too wet, it will boil the water out when you pour, and you'll see your metal bubbling. This will cause poor quality and voids. One way to help prevent this is to heat your mold cavity with a torch prior to using it to help set the sand and evaporate the water.</p><p></p><p>You want it just wet enough so that you can take a handful and squeeze it and it will hold its form. Also, make sure your forms have plenty of draft on them, or you'll be cussing trying to get the mold to release and leaving bits of itself behind. Some talcum powder in a sock helps. You can dust your form with it.</p></blockquote><p></p>
[QUOTE="Larry Morgan, post: 1462055, member: 4676"] Mixing casting sand is a fine art. It's easy to get it too wet. You want to use bentonite, as already mentioned, with fine sand. Then you slowly start adding water. Unless you have a machine, mixing is tedious. The bentonite will instantly absorb the water and clump, so you have to mix it and condition it until it's nice and smooth. If you get it too wet, it will boil the water out when you pour, and you'll see your metal bubbling. This will cause poor quality and voids. One way to help prevent this is to heat your mold cavity with a torch prior to using it to help set the sand and evaporate the water. You want it just wet enough so that you can take a handful and squeeze it and it will hold its form. Also, make sure your forms have plenty of draft on them, or you'll be cussing trying to get the mold to release and leaving bits of itself behind. Some talcum powder in a sock helps. You can dust your form with it. [/QUOTE]
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