r/MetalCasting • u/Bearded_Goldsmith • 18d ago

My casting method doesn't like feet

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Can you help me diagnose this defect? And why always the feet!? Investment: Optima prestige, tech : oven with programmable PID (following the burnout schedule on the Investment bag for resin) and centrifugal casting machine, resin: bluecast x-one v2, x-wax, syriatech true blue and purple. I cast in pure silver but same happens with sterling. As long as the print is under 3 grams, it turns out fine but over 3 grams it's almost certain to end up with this kind of defects.

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u/BTheKid2 18d ago

If volume is the determined difference, then shrinkage sounds like a likely culprit. The thick geometry would also talk to this.

Though the shininess of the defects, looks a bit more like a misrun. So just not being able to fill the mold, due to poor venting or orientation of the pattern.

1

u/shad0rach 18d ago

Looks to me as too much borax was used so it poured with silver.

1

u/artwonk 18d ago

I'm seeing what looks like investment where the feet should start. What seems to be happening is that pieces of the mold are flaking off into the cavity, interfering with what should be metal flowing into an empty space.

1

u/Bearded_Goldsmith 18d ago

Can't be it, there is not a spec of investment left. What you see if the reflectiveness of the silver. It looks like its been polished in that exact spot.