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Casting

Lost-wax bronze casting

The pour stopped short. Here is what I think happened.

Bronze, cast from a wax pattern

A purple wax ring pattern on a hand, with cast bronze pieces on the bench below
  1. Sketch
  2. CAD
  3. A purple wax ring pattern on white paper
    Part
  4. A wax pattern on a kitchen scale reading 3.7 grams
    Test

Overview

A lost-wax casting from a semester-long metals class at Dallas College, made with my professor's direct help. The pour stopped short of filling the mold. I have three likely causes and no confirmed answer yet.

Role
Wax to pour, with the professor
Process
Casting
Sketch to part
2 weeks
Where
Dallas College
Tools
  • Wax pattern
  • Investment
  • Bronze
  • Kiln

The class

This came out of a semester-long metals class at Dallas College. The casting itself took about two weeks, and I did it with my professor's direct help.

A purple wax ring pattern on a finger, palm up
Fitting the wax ring before it went into the mold.

The pour

The metal stopped short and did not fill the whole mold.

I don't know the root cause for certain. My best guesses: the metal didn't get far enough in, the geometry was too complex, or the sprues weren't wide enough to let it flow in fast enough.

I kept this one on the site anyway. Knowing when something failed, and that there is something to learn from it, matters more to me than having the perfect term for it. Filling a cavity before the material sets is the same problem injection molding deals with, which is part of why that process interests me.