Can we talk about the time I spent 8 hours chasing a mold shift that wasn't there?

I was running a batch of gray iron castings last Wednesday and kept getting this mold shift on the cope side that made no sense... I tore down the flask pins, checked the matchplate alignment, even redid the sprue geometry. Turns out it was just a loose core print that I could have fixed in 20 minutes if I'd looked at it closer first. Has anyone else spent half a shift on the wrong problem only to find it was something way simpler?

4 comments

4 Comments

caleb_bell56d ago

Man I did nearly the same thing with a loose core print in ductile iron last month, drove me nuts for six hours.

the_sage6d ago

Counterpoint here caleb_bell5, a loose core print can actually work in your favor sometimes if you adjust your gating system to force more flow around it. Maybe it was just bad luck or the iron chemistry fighting you, not the print itself.

wadejenkins6d ago

Hate to hear that, @caleb_bell5. Had a similar run-in with a shift in green sand a couple years back. Spent the better part of a swing shift chasing a defect that looked like a gas hole but turned out to be a tiny bit of clay wash from the mold face. Just one of those days where you're checking everything twice and it still sneaks up on you. Hope the rest of your run went smoother after you found it.

victorhernandez6d ago

saw a thing on instagram the other day about green sand molds and how even the temp of the sand can mess with the finish. guy was saying if the sand gets too hot the moisture kinda moves around and then you get these weird defects that look like gas but its really just the clay getting pushed around. made me think of your clay wash thing wade. crazy how something so small can ruin a whole part.