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I swapped to a new sand mix for our greensand molds last week.
We usually use a 50/50 blend, but I tried a 60/40 mix with more new sand on a small batch of gear castings. The molds held shape way better during pouring, but the surface finish came out rougher than I expected. I think the extra new sand didn't bond as well with the clay. Has anyone else run into this with a higher new sand ratio?
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zaranelson16d ago
Yeah, you need a touch more clay to glue that extra new sand together.
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skyler_johnson3216d ago
Sounds like your clay content is too low for good bonding.
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casey26816d ago
Disagree, sometimes less clay means fewer cracks. Skyler_johnson32 ever try a lean mix on purpose?
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