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Switched from a 50/50 sand mix to 70/30 for our greensand molds last month
Always thought the extra clay in the 50/50 mix was needed for strength, but our foreman, Mike, showed me how the 70/30 mix at our Tacoma plant cuts down on gas defects. We ran a test batch on some heavy flange castings and the surface finish was way cleaner. Anyone else try adjusting their sand ratios for different jobs?
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the_cameron5mo ago
Lol, "sweet spot is a band-aid" is a wild take from @kim_davis. Sometimes the old standard just needs a tweak for new problems, like your gas issues. Sounds like you found what works for your shop.
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rowanw915mo ago
Yeah we had to tweak ours for some complex cores. That extra clay in the 50/50 can really hold moisture and cause issues. Found a sweet spot around 65/35 for our stuff.
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kim_davis5mo ago
That "sweet spot" sounds like a band-aid. The 50/50 mix is standard for a reason, it gives you the strength you're probably losing at 65/35.
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