MIL-STD-866 Grinding Of Chrome Plated Steel And Steel Parts Heat Treated To 180,000 Psi Or OverThis standard establishes the requirements for grinding of martensitic high strength steel heat-treated to 180,000 pounds per square inch psi, ultimate tensile strength uts and above, and the grinding of chromium plating applied to such high strength steel, when such parts are intended for use in components for man-rated flight hardware.

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MIL-STD-866C

ASTM E-1417             Practice for Liquid Penetrant Examination

(Copies of these documents are available at ww.astm.org or ASTM International, 100

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2.4   Order of precedence.   In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3.   DEFINITIONS   Not applicable.

4.   GENERAL REQUIREMENTS

4.1   Material and equipment

4.1.1   Materials.

a.   Grinding Coolant.  A suitable coolant shall be used, which does not have an adverse effect on the part being ground.  Re-circulated coolants shall be either gravity separated or contaminants or continuously filtered to minimize re-cycling grinding residue.  A coolant nozzle sufficiently wide to flood the entire width of the wheel interface area shall be used.

b.   Grinding wheel.   Grinding wheels shall be labeled or numbered as to abrasive type, grit size, grade, structure, bond type, and maximum operating speed. Unless otherwise specified, aluminum oxide vitrified bonded, grinding wheels shall be used.

4.1.2   Equipment.

a.   Grinding equipment.  Grinding equipment shall be capable of maintaining grinding speed, work speed (spindle or traverse), cross feed and down feed in increments necessary to avoid surface degradation of the part.  Provisions shall be made to supply a constant application of coolant to the working surface of the wheel.

b.   Ovens.  Ovens used for baking and stress relieving shall be controlled in accordance with SAE-AMS-H-6875.

4.2   Processing.

4.2.1   Grinding process.   The grinding process shall be performed in accordance with Table I to result in metallurgical sound parts.  All feeds, speeds, and stock removal parameters are actual and not necessarily machine or indicator readings.

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