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"Sand Molds for Simple, Resin or Metal Casting?" Topic

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Thresher0118 May 2019 9:43 p.m. PST

Just curious if anyone has tried making sand molds for simple shapes, for resin, or metal casting?

I recall using it back in shop class to make styrofoam shapes, back in the day. Think we might have poured metal too, IIRC.

They had a special type of "casting sand" which was pretty finely grained, and we wet and compacted it before use, in two-part molds.

Anyone familiar with doing this in the "modern age"?

Personal logo Gungnir Supporting Member of TMP18 May 2019 10:07 p.m. PST

Read up on it years ago. You can make your own casting sand by mixing about 5% of clay into regular builders'sand.

Mixing wet is easiest, but let dry thoroughly before casting.

HistoriFigs19 May 2019 8:49 a.m. PST

I've never done any small parts this way.
Most of my casting has been aluminum and bronze; can't say that I've even seen anyone cast with resin.

You can find sand casting supplies easily enough; a quick search should give you a few hits. Casting sand runs about $5 USD a pound, less if you by in larger quantities.

If I ever get all (ok, most) of my unused/un-needed junk, I may get back into sand casting; likely in aluminum. I could see doing some simple shapes in smaller sizes, but not sure how small I'd go; a lot of effort for most things I could think of related to games with miniatures.

Tony S19 May 2019 6:54 p.m. PST

When I was a kid, I used casting sand for various things, but I never knew you could make two part molds from sand. I used to try making two part molds from plaster. (For the record, figures from plaster of Paris molds are pretty bad)

Looking back on it, I guess I have to thank my parents for letting a twelve year old kid heat lead on a stove, and pour it in plaster molds. At least, I think they knew what I was doing? Maybe they didn't?

I can't really think of casting anything too useful for wargaming that way though. Maybe hills or islands?

Zephyr119 May 2019 9:11 p.m. PST

Damp sand may react with the resin. And then you'll also have to remove all that sand sticking to the surface of the cast (unless it's a texture you want…)

Garand20 May 2019 8:56 a.m. PST

Last week I made a simple push mold out of epoxy putty, to duplicate a missing part in a model (it was a return roller for a Pz IV). I then simply melted some styrene sprue & pushed it into the mold, worked fairly well. A little OT, but an option too, for casting simple shapes.


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