11
The core washout on that big gear pattern took me three full days to figure out
Had a job for a local machine shop, a big helical gear pattern about 30 inches across. The core kept washing out in the same spot every single pour, right at the thickest section. I tried everything I thought I knew: rammed the sand harder, changed the venting, even switched to a different facing sand. Nothing worked. My partner finally said, 'What if the heat is just sitting there too long?' We ended up having to design a special internal chill, a steel insert we buried right in the middle of that core. Took us from Tuesday morning to Friday afternoon to get a clean casting. Anyone else ever get stuck on a washout that simple fixes just wouldn't touch?
3 comments
Log in to join the discussion
Log In3 Comments
moore.beth16d ago
Sounds like you were fighting physics instead of the sand. Sometimes the answer isn't more technique, it's just pulling the damn heat out faster. Glad a chill finally solved your three-day headache.
5
roberts.leo16d ago
Right? Overthinking it always makes it worse. Just gotta let the thing cool down sometimes.
3
faith_hart2016d ago
Did you ever figure out why the heat was concentrating there in the first place? The geometry must have been just right to trap it. I'm curious if the pattern itself needed a tweak.
0