MIL-HDBK-1897(AT)
FIGURE 2. Tolerances for angular surfaces of as-cast investment castings.
5.1.6 Squareness (angular part). Control of tolerance on flat, angular-type parts is difficult. Redesigning incorporating brace reinforcements or straightening, if feasible and permitted, are alternative solutions. The amount of straightening should be a function of section thickness, variation, and support ribs. Where straightening is feasible and permitted, a tolerance of + 0.5 should be maintained.
5.1.7 Surface texture (finish). The height of roughness should be expressed in microinches Arithmetic Average ( in. AA) as defined in SAE J448a, section 4.1. This value is used to describe surface texture of as-cast investment castings after cleaning in accordance with the engineering requirement, i.e., sand blast, and should be in accordance with values specified in table VI.
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