Standard PRactices

Aluminum Investment Casting Guidelines

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The values listed below represent standard industry ranges for key dimensions used to evaluate aluminum investment castings. These guidelines define typical process capability and compliance criteria.

Deviation from standard practices may increase cost and complexity. Designs aligned with established ranges are recommended to maintain efficiency, consistency, and overall manufacturability.

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Industry Standards We Follow

Radii

As a general rule, a 0.03 maximum corner and a 0.06 minimum fillet are recommended. Smaller radii are possible depending on the complexity of the design.

Angles

Angular tolerances of +/-1/2 degree are normal.

Flatness and Straightness

When a high degree of flatness and straightness is required, castings must be mechanically straightened; however, proper design can control distortion and minimize straightening functions. Flatness and straightness tolerances are .003 to .005 TIR per linear inch and depend on alloy properties and configurations of part.