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Eagle Aluminum Cast Products - Perm Mold
The following are the normal tolerances that can be applied to as-cast parts produced from each available process. Any deviation from these guidelines will be considered on a case by case basis. Specific part geometry may require or allow an increase or decrease in tolerance from this standard. Subsequent operations (e.g. grinding, machining, etc.) may improve tolerance on specific dimensions.
1 st inch +/-.015
Additional inch +/-.002
Across Parting Line Additional +/-.010 for 0in²-10in²
Additional +/-.015 for 10in²-50in²
Additional +/-.020 for 50in²-100in²
Draft Minimum 3 degrees
As-Cast RMS Finish 300 RMS Minimum
Min. Wall Thickness .100
Shrink Factor .007-.013but can vary on size / design of job
1 6 inches +/-.030-.060
Each inch over 6 inches Additional .003
Across Parting Line Additional .030
Draft Minimum 7 degrees
As-Cast RMS Finish 350 RMS Maximum
Min. Wall Thickness .250
Shrink Factor .008/inch (Fascias) & .010-.012/inch on small flat parts.
Note: Angles can range from sharp to .060 on radii / fillets. It depends on design of casting.