A-A-52535
2.2 Materials. The materials shall be high quality, heat treated as required, and properly selected for durability and long life under the severe operating conditions intended. Asbestos, cadmium, and radioactive material shall not be used in any form or part of this item. Radioactive material is defined by Title 10, Code of Federal Regulations, Part 40, and other radioactive material in which the radioactivity is greater than 0.002 microcuries per gram or 0.01 microcuries total activity for the item. The use of recovered material made in compliance with regulatory requirements is acceptable providing that all requirements of this CID are met (see 3.1).
2.3 Design and construction. The drill design and construction shall be representative of a standard commercial rock drill with a proven history of durability and performance, which also meets the requirements of this CID.
2.3.1 Weight. The drill shall weigh not less than 55 pounds or more than 65 pounds.
2.4 Performance. The drill shall be capable of achieving a minimum drilling rate of 14 inches a minute in Barre granite when using a 1.75-inch diameter, 4-point centerfold, tungsten-carbideinsert detachable drill bit. The compressed air supply used with the drill shall be capable of delivering air through a .75-inch rubber air hose at a minimum pressure of 125 pounds per square inch gage (psig) at a rate of 210 cubic feet per minute (cfm),-md a pressure regulating valve shall be set to maintain 90 psi at the tool. Performance shall be unimpaired at any ambient temperature from 0 degrees Fahrenheit (“F) to 125°F.
2.4.1 Deep hole drilling performance. The drill shall be capable of drilling the full length of a 20 foot long drill rod into homogeneous rock (with an average specific gravity of not less than 2.6) using a bit of not less than 1.63 inch diameter.
2.5 Maintainability and reliability.
2.5.1 Maintenance support. Technical manuals, illustrating repair parts and recommended operation and scheduled maintenance, shall be furnished with each drill. All repair parts having the same part number shall be functionally and dimensionally interchangeable.
2.5.2 Reliability. The standard of quality of the drill construction shall be such that not more than five man-hours of maintenance are projected for each 100 hours of operation. The mean time between expected component failures shall be projected as not less than 50 hours. Documentation shall be provided substantiating the manufacturers projections for typical maintenance activity.
2.6 Construction characteristics. The following characteristics are required in the rock drill to promote safety, reliability, and service life.
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