How close are the tolerances the die casting process can achieve?
A. The tolerances that can be specified on a part design intended for die casting will vary with the precise configuration of the part, the alloy being cast, and whether a dimension is contained entirely in one half of the die, or falls across a parting line or is formed by a moving die component. Casting accuracy will also depend on the die casting machine being used and its control systems. As an approximation, the tolerance on a dimension between features formed in the same die part can be held to from +/-0.002 to +/-0.014 (+/-0.051 mm to +/-0.356 mm) , dependent on the additional qualifications mentioned above. For specific dimensional tolerancing guidelines, consult the 223-page NADCA Product Standards Manual, available from CWM at a special discount (See description & Discount Order Form). The Standards Manual provides guidance on such questions as draft, radii, and flatness, among other design characteristics, and can be consulted prior to discussions with CWM engineering.
