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I keep seeing guys in our shop skip the full preheat on the core boxes for our gray iron castings. They say it saves 15 minutes, but I've seen three blowouts this quarter from cold spots. What's the actual time versus risk here?
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ninabutler5mo ago
...and my buddy over at Brenner Foundry learned this one the hard way. He had a guy who thought he was slick, shaving off that preheat on the cores to get out early on a Friday. The third time a cold spot blew out, it cracked the mold and sprayed hot iron halfway across the shop floor. Took a full shift to clean up and they had to scrap a whole batch of castings that were already in the line. He told me that 15 minutes cost them closer to 3 grand in lost metal and labor, and it almost got someone hurt with that blowout.
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piperr586mo ago
Ever try to save 15 minutes and end up losing half a day? That math never works out.
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adams.vera6mo ago
Saving 15 minutes is a false economy. Those blowouts cost hours in cleanup, scrap metal, and machine downtime. A rushed job means you're redoing it later. The preheat cycle exists for a reason, and skipping it is just gambling with the whole pour.
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