MIL-HDBK-1897(AT)
FIGURE 4. Minimum wall thickness in relation to cored cavity for investment castings.
5.1.10 Radii and fillets. Sound casting design necessitates incorporating proper tolerancing
of radii and fillets to minimize stress concentrations, tooling costs (internal coring), turbulence and wear, etc. Suggested minimum tolerance on all radii is + 0.016 inch. Where smaller tolerances
are absolutely necessary, see table VII.
TABLE VII. Radii and fillet tolerances for investment castings.
Radii |
Minimum tolerance for fillet and external radii |
0.031 0.062 0.125 0.250 0.500 1.000 over 1.000 |
+ 0.004 + 0.004 + 0.004 + 0.004 + 0.005 + 0.005 + 0.005 inch/inch |
10
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