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Making a sand mold without a pattern

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ironman:
Here is a video showing how I made the mold when ductile iron was melted.   

vtsteam:
Now there's a method of casting I hadn't seen before! Excellent, and informative.

Ironman are you still using cement and sand mix for your core sand, or is it something else?

ironman:
No I found that cement sand cores are hard to dig out in tight pockets so I use more expensive binders (Fiberglass resin) I still think that cement sand is the cheapest core sand around.

vtsteam:
Oh, fiberglass resin.....is it the common fiberglass polyester laminating resin, and hardener, or is it a special core sand resin made for the purpose?

The cores look very sharp and strong.

mexican jon:
Thanks for that  :thumbup: very interesting watch  :clap:

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