A near miss with a cracked crucible at the old Johnson Foundry taught me to listen for that high-pitched hum.

Dakota Lee · 2026-04-15T23:25:04.267072+00:00

I was pouring a 1500 degree bronze batch for a gear blank when I heard a faint ringing from the crucible wall and immediately shut down the pour, saving us from a major spill and potential injury, so what's your go-to method for checking crucible integrity before a big pour?

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A near miss with a cracked crucible at the old Johnson Foundry taught me to listen for that high-pitched hum. | Foundry Workers - Guest Forum