Had a core shift on a big gear blank pour at the old Tacoma plant

We were pouring a 500 pound gear blank and I saw the sand core start to float up right in the middle of the fill. My foreman yelled 'hold it!' and I jammed a heavy steel rod down the riser to pin it in place until the metal set. It worked, but we had to grind off a big lump of extra metal from the bore. Anyone ever have a better fix for a floating core on a vertical job?

4 comments

4 Comments

tyler_young1mo ago

Just let it float and scrap the part.

alexpalmer1mo ago

Is it really that big of a deal though lol

angela72810d ago

Just let it float and scrap the part"? You'd scrap a 500 pound pour?

the_sage1mo ago

What if letting it float is the smarter move sometimes? You scrap one part but you save all the time and risk of trying a crazy fix that might not even work. Grinding off that lump sounds like a ton of extra work for a part that might still have hidden flaws.