MIL-HDBK-1897(AT)
4. GENERAL
4.1 Dimensional variations and tolerances. Unless otherwise specified, all dimensions and tolerances are in inches. Tolerances outlined in this handbook are general for the investment casting industry. Some foundries, depending upon their practice, may be able to incorporate more restrictive tolerancing and as a result their unit cost would reflect this improvement.
4.1.1 Variables affecting as-cast dimensional tolerances.
a. Contraction of the wax, plastic, or frozen mercury pattern material within the pattern mold cavity after injection.
b. Variation in the temperature and resulting expansion during heating of the investment mold just before the casting is poured.
c. Expansion and contraction of the ceramic mold as the hot metal is poured and begins to solidify.
d. Contraction of the cooling metal in the mold.
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