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I finally figured out why my cores kept cracking after 3 years of fighting it
At the shop in Akron last Tuesday, I was pulling a gray iron casting and the core broke in half before I even got the mold closed. My foreman walked over and said the sand mix was too dry by about 2%. Has anyone else had this issue with fine sand causing cracks?
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michaels954mo ago
That's not quite right, dry sand usually makes cores crumble not crack.
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joel_mason224mo ago
Maybe the fines were packing unevenly, making the core weak in one spot (which snaps easy).
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