A-A-2690A
2.3 Motor: The sander shall be equipped with a rotary vane-type motor.
2.4 Throttle: The sander shall be equipped with a manually operated, lever-type throttle that shall automatically close the air inlet valve when actuating hand pressure is removed.
2.5 Lubrication: Provisions shall be made for lubrication to be supplied to the rotor, cylinder, and other moving parts in the path of the air stream. The oil may be applied manually into the motor or supplied automatically through the air supply line. Other suitable means shall be provided for supplying lubrication to gears and other moving parts not in the air stream.
2.6 Air inlet connection: The sander shall have a female, 1/4-inch size, NPT or NPTF air inlet connection. The inlet shall be equipped with an air filter with an air filter of 20 mesh or finer which shall be effective in preventing solid particles in the compressed air supply from entering the tool. The filter shall be easy to remove, clean, and replace.
2.7 Bearings: The rotor shaft shall be provided with ball bearings. Needle and roller bearings, which are primarily designed for radial loads, shall not be used in a thrust position. If open type bearings are used, they shall be suitably housed and adequately sealed to prevent leakage of lubricant and may entrance of dirt and dust. Sleeve bearings are not acceptable.
2.8 Backup pad: Sanders shall be equipped with a pad for backing the abrasive disk of the size specified in the Table I. The pad shall have a minimum thickness if 1/4-inch. It shall be made of a neoprene sponge and shall be capable of withstanding shock without permanent deformation or rupture. The pad shall have a canvas suitable for use with glue-on abrasive disks.
2.9 Random orbital motion: Sanders shall contain a counterbalanced offset drive spindle which shall produce a combined rotary and oscillating (random orbital) pad surface motion when the tool is operated under load.
2.10 Manual: One copy of a technical manual consisting of the manufacturer’s standard commercial instruction and parts list shall be furnished with each tool.
2.11 Workmanship: Details of workmanship shall be in accordance with the best commercial standards and practices. Paints, coatings, platings, and finishes shall be smooth, dry, adherent, continuous, and not stained or discolored. Fasteners shall be firmly secured and show no evidence of deformation, cross threading, or hazardous burrs. The adhesives and lubricants adequate for their intended purpose shall be properly and neatly applied. Adhesives shall be adequately cured. There shall be no interference, binding, or galling of parts. External and bearing surfaces shall be free of tool and gouge marks, nicks, or other surface imperfections. The item shall be clean and free of corrosion and debris (e.g., chips, shavings, slivers) or other foreign materials. The item shall be free from manufacturing workmanship defects (e.g., loose, missing, binding, or misaligned parts, sharp or rough external edges, corners or surfaces) and material workmanship defects (e.g., pits, rips, fins, burrs, tears, nodules, cracks, blisters) which may adversely impact the item’s serviceability, durability, safety, or appearance.
3. Regulatory requirements: In accordance with Section 23.403 of the Federal Acquisition Regulations, the Government’s policy is to acquire items composed of the highest percentage of recovered materials practicable, consistent with maintaining a satisfactory level of competition without adversely affecting performance requirements or exposing supplier’s employees to undue hazards from the recovered materials.
3.1 Metric products: Products manufactured to metric dimensions will be considered on an equal basis with those manufactured using inch-pound units, provided they fall within the tolerances specified and all other requirements of this document are met. If a product is manufactured to metric dimensions and those dimensions exceed the tolerances specified in the inch-pound units, a request should be made to the specification preparing activity for change to this document.
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