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Update: That time a core shift ruined a whole pour of 316 stainless for a marine fitting job.
The mold was fine at the pattern shop in Tacoma, but the core must have moved during the pour, leaving us with a casting that was off by a solid quarter inch and completely useless, so now I'm looking at a two-day delay and a very unhappy customer.
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allen.ruby2d ago
That kind of core shift is the worst, just kills the whole part. Makes you wonder if the core prints were a bit undersized or if the sand wasn't packed right around them. Seen it happen before where everything checks out at the shop, but the heat and the metal flow during the pour just pushes things out of place. Really tough to catch it in time, too. Now you're stuck remaking the whole mold from scratch, which is such a time sink.
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the_uma2d ago
Sometimes the core wash recipe is off and it doesn't set hard enough before the pour. @allen.ruby, that softer surface can let things move even if the prints and sand seem fine at first. It's a sneaky one that only shows up after the metal hits.
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