A-A-50459A
2. Safety. Shears shall be mechanically and electrically safe. Safety devices shall be provided to protect the operator from accidental contact with rotating, reciprocating or such moving parts which might be hazardous. Electrical components and motor shall be completely enclosed, except for ventilation openings conforming to UL 45.
3. Lubrication. Bearings, except sealed bearings which are prelubricated, gears and moving parts shall be assembled with lubricating medium. Provisions for lubricant replacement shall be provided. Lubricant shall not leak from the gear casing or enter the motor compartment.
4. Interchangeability. All parts from the same manufacturer shall be manufactured to standards which will permit interchangeability of similar parts without modification or adjustment.
5. Material. Materials used in fabrication of shears shall be new, of uniform quality and be produced according to standard practices of reputable manufacturers producing equipment which will meet the requirements of this specification.
6. Construction. Shears shall be complete so that when connected to the specified sources of power, they can be used for any designed operation. Construction shall be free from any characteristics or defects that will prevent the machine from satisfactorily performing the requirements of table I.
7. Castings. All castings shall be free from defects, scale or mismatching. In no event shall such processes as welding, peening, plugging or filling with solders or metallic pastes be used on casings for reclaiming any part.
8. Surfaces. Surfaces of all castings, forgings and molded parts shall be cleaned and free of sand dirt, fins, sprues, scale, flux or other harmful or extraneous materials. External surfaces shall be smooth and all edges shall be rounded or beveled. Surfaces shall be finished according to the manufacturer’s standard practice.
9. Welding, brazing or soldering. Welding, brazing, or soldering shall be employed only where those operations are included in fabrication of the original design. These operations shall not be employed as repair measures for defective parts.
10. Fastening devices. All screws, pins, bolts, and similar parts shall be installed with means of preventing loss of tightness. All such parts, when subject to removal or adjustment, shall not be swaged, peened, stalked or permanently deformed. Threaded parts shall be in the inch system and shall conform to National Bureau of Standards Handbook H28- Screw Threads for Federal Services.
11. Components. Shears furnished under this CID shall consist of a motor switch, cable and plug, wiring, housing, gears, shafts, bearings, cutting blades and handle. Type I shears shall have a yoke and type II shears shall have swivel head.
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