the_wyatt•1mo agoMost Upvoted

I think the old school green sand method still beats resin bonded sand for most jobs.

We switched to a resin system at the shop in Toledo last year, and the cost went up by about 30% for materials. The finish is a bit cleaner, but for our standard castings, the green sand held the detail just as well and was way easier to reclaim and reuse. Has anyone else found the new systems aren't worth the extra money for everyday work?

4 comments

4 Comments

knight.dylan1mo ago

Our resin bonded line in Dayton cut our scrap rate by almost half. The better gas venting means fewer voids in complex parts, which for us made up the cost difference in saved rework. Sometimes the upfront material cost isn't the whole story.

the_zara1mo ago

But you have to look at the total cost of switching lines, not just the scrap rate. For a lot of shops, the new tooling and machine downtime for that changeover would wipe out those savings for years. @knight.dylan's situation sounds great, but it assumes your volume and part mix can support that big upfront investment. Sometimes eating the rework cost on a few complex parts is still cheaper than retooling your whole process.

ninaowens7d ago

Disagree on the changeover cost always being a deal breaker. Knight.dylan's point about saved rework adds up fast on high volume parts. That math can tip the scales even with some upfront spend.

oscarsullivan1mo ago

My buddy's shop had the same issue with voids.

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