MIL-STD-866C
4.2.2 Cleaning. Protective coatings and other foreign materials shall be removed from parts prior to grinding to preclude contamination of coolant and wheels. Coolant and grinding residuals that have a deleterious effect on the part shall be removed after grinding. Cleaning materials shall not corrode or otherwise degrade the surfaces of the part. Where process delay time is such that corrosion might occur, parts shall be adequately protected after cleaning.
5. DETAILED REQUIREMENTS
5.1 General. The contractor shall maintain in-house documents designed to establish control of inspection procedures to assure that parts produced are within acceptable design criteria. The contractor shall be able to demonstrate that he is applying such controls.
5.2 Responsibility for inspection. Unless otherwise specified in the contract, the contractor is responsible for the performance of all inspection requirements as specific herein. Except as otherwise specified in the contract, the contractor may utilize his own or any other facilities suitable for performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in this standard where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.
5.3 Inspection requirements and procedures.
5.3.1 Ground surface inspection. All ground surfaces shall be visually inspected without magnification for evidence of overheating, cracks, tears and cold flow. Ground surfaces shall be checked for surface finish.
5.3.2 Magnetic particle inspection. All ground surfaces (excluding ground holes) shall be inspected by magnetic particle in accordance with ASME E-1444 or approved alternate procedure (see 5.3.4).
5.3.3 Nital etch inspection. All ground surfaces (excluding ground holes and chromium plate) shall be inspected by nital etches in accordance with MIL-STD-867 or approved alternated procedure (see 5.3.4 and 5.3.5). Water may be used as an alternate solvent for the nital etch solution. After nital etching, parts shall be baked at
375°F for four (4) hours.
5.3.4 Ground holes. All ground holes shall be treated as ground surfaces unless engineering requirements, size, shape or location make magnetic particle or nital etch impossible or impracticable. When ground holes are not inspectable by magnetic particles or nital etch, approved alternate procedures or parametric study data shall be used to establish that the surface has not been degraded (see 5.4.2).
5.3.5 Chromium plate. After final grinding of chromium plated parts, the parts shall be inspected for grinding - induced damage to the chromium plate and base metal as well as base metal cracking. Penetrant inspection shall be used for the detection of plate and base metal damage and magnetic particle inspection will be used for the detection of base metal cracking for chromium plate thicknesses less than 0.004 inch per surface, penetrant inspection shall be used for detection of plate and base metal
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