Sand Casting Tolerances
Considerations
At Leitelt Brothers Inc, we help our clients address key design factors prior to production:
- Draft Angles: Proper draft ensures patterns can be removed from the sand mold without damage.
- Shrinkage Allowance: Molten metal contracts as it cools; patterns must account for this.
- Fillets and Radii: Smooth transitions between surfaces improve flow and reduce stress concentrations.
- Gating System Design: Effective gating minimizes turbulence, reduces defects, and ensures uniform fill.
By addressing these considerations early in the design phase, we enhance part reliability, reduce costs, and optimize manufacturability.
Key Sand Casting Design Guidelines
- Draft Angles: Add a taper of 1 to 3 degrees on vertical surfaces to allow easy removal of the pattern from the sand without breaking the mold.
- Fillets and Radii: Use generous rounds and fillets at internal and external corners to avoid sharp edges, reduce stress concentrations, and prevent hot tearing
- Avoid Heavy Sections: Minimize isolated thick sections at junctions where metal cools slowly and forms hot spots; use cores or redesign to equalize mass.
- Machining Allowances: Add extra material on critical surfaces that require post-cast machining or finishing.
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From aluminum to brass and bronze, our team is ready to deliver high-quality sand castings tailored to your specifications.
Industries
We’re proud to serve a wide range of industries with high-quality castings and exceptional service.
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