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Employ Uniform Sections

Thicker walls will solidify more slowly, so they will feed thinner walls, resulting in shrinkage voids. The goal is to design uniform sections that solidify evenly. If this is not possible, all heavy sections should be accessible to feeding from risers.

Fig. 5: This hydraulic coupling was originally designed with a core that caused localized porosity. By redesigning the component with uniform walls, the weight of the casting was reduced, lowering the manufacturing cost and remedying the shrinkage problem.

Illustration - before and after component with uniform walls

Next: Rule 6. Correctly Proportion Inner Walls >>
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10 Rules for Engineered Quality

This article was adopted from a section of Casting World Magazine. Reprinted with permission.