OO-M-340F
3.3 Material. Materials not specifically designated herein or in the acquisition order shall be of a quality commensurate with commercial practice within the machine tool industry. The materials shall be suitable for the intended purpose in the design of the end item and shall meet all requirements specified herein. Materials shall be free from defects that would adversely affect
the performance or maintainability of the individual components or the overall assembly. When dissimilar metals are used in contact with each other, suitable protection against galvanic corrosion shall be applied in accordance with MIL-STD-889.
3.3.1 Recycled, recovered, or environmentally preferable materials. Unless otherwise specified herein, all materials covered by this specification shall be new. However, recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements and promotes economically advantageous life cycle costs.
3.4 Construction. Parts used in fabrication of the attachments shall be clean and free of defects. External surfaces shall be smooth and free of sharp edges. Screws, pins, bolts, and similar fasteners shall be installed with means to prevent loss of tightness and adjustment. Parts subject to adjustment or removal shall not be swaged, peened, staked, or otherwise deformed.
3.4.1 Castings and forgings. Castings shall be free from visible blowholes, porosity, hard spots, shrinkage defects, cracks, or other defects. Forgings shall be free from visible scale, inclusions, cold shuts, mismatching, sharp edges, or other defects. Castings and forgings shall be free from any properties adversely affecting their strength, durability, or suitability. Reclamation or repair of major castings and forgings is permitted if the repair is not on a critical surface.
3.4.2 Welding. Welding of carbon steel base materials shall be accomplished using filler metals listed in AWS A5.1, AWS A5.18, AWS A5.20, or equivalent. These operations shall not be employed as repair measures for defective parts.
3.4.3 Electrical connections. Connections of conductors and terminal parts shall be of the screw, pressure, or solder type. When soldered connections are used, the conductors and terminal parts shall be mechanically secured before soldering. Only rosin based fluxes shall be used in
soldering operations. Connections to screw type terminals shall be mechanically secured with a means to prevent loss of tightness.
3.4.4 Lubrication. All bearings (except sealed, permanently lubricated type), mating gears, and other moving parts shall be provided with means to ensure adequate lubrication. Re-circulating systems shall include filters that are cleanable or replaceable. Each lubricant reservoir shall have means for determining fluid levels. Oil holes, grease fittings, and filler caps shall be accessible. The manufacturer shall include and install all lubricants, fluids, greases, and other compounds in accordance with the best commercial practice of the producing industry (see 6.4). The lubrication systems shall be temporarily capped or stopped to prevent loss of lubricants during shipment.
The manufacturer shall include a warning notice in the instruction manual and on the attachment to remove the temporary caps or stoppers before start-up or use of the attachment.
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