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Ring Shank Design

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ironman:
When I lift up the ring shank the crucible is full of iron and is very heavy so it wedges into the ring very tightly so there is no fear of the crucible from coming out.

vtsteam:
Thanks Ironman! Yes I've only been using a Morgan A6 (relatively small), and it only tended to fall out at the end of the pour with maybe half capacity, so what you are saying makes sense. It did mess up the casting by falling out once before I was finished pouring, another time the sprue was full, so it was not spoiled.

I have since gone to an open-back, double-arm squeezing type of ring shank with a flat bar ring, and it positively grips the crucible. I've had no problems since.

In a conventional welded and closed ring shank, I do think it's important not to do what I did at first -- make the ring out of round bar, because that doesn't wedge as easily. Make it out of flat stock. Hard corners would help -- no need to round them, also.

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