Just realized our shop's old timer and the new hire have totally different takes on pouring speed

Honestly, I was cleaning up after a big pour yesterday and heard our senior guy, Mike, tell the new kid that 'slow and steady wins the race' for our gray iron castings. He said rushing it caused a cold shut on a 200-pound gear blank last year. But then the kid, who just finished trade school, said his instructor taught them that a faster pour from a higher head height reduces oxidation and improves surface finish. Ngl, it got me thinking. We've always done it Mike's way, but maybe there's something to the newer method for certain jobs. Has anyone else run into this debate and found a good middle ground for different metals?

2 comments

2 Comments

laura2117h ago

Actually, a higher head height can cause turbulence and make inclusions worse.

jamieperez6h ago

What about the mold material itself though? Laura211 is right about turbulence, but if you're using a different sand or coating, that changes everything. A faster pour into a really dry sand mold might be fine, but a slower pour is safer for a green sand mold that's more likely to erode. The "right" speed isn't just about the metal, it's about what you're pouring it into.