A-A-52593A
2.2.3 Air coupling nipple. A male quick-disconnect coupling nipple conforming to figure 1 shall be provided. The thread size shall be 1/4-18 NPT. The nipple shall be capable of operating at pressures up to 150 pounds per square inch (psi). The nipple shall interface with military type II, class C female couplings conforming to A-A-59439.
2.2.4 Stroke. The length of the stroke shall be not more than 1.75 inch (in.) or less than 0.25 in. at the no-load speed.
2.2.5 Dimensions. The overall length of the saw shall be not more than 14.5 in. excluding the blade.
2.2.6 Weight. The weight of the saw excluding the blade, shall be not more than 5.5 pounds (lbs).
2.3 Performance. The saw shall cut 0.25 in. 6061-T6 aluminum plate at an average rate of not less than 3 in./min at the applicable cutting strokes per minute (min) and air consumption as specified in table I.
TABLE I. Performance characteristics.
|
Type air motor
|
Strokes per minute (minimum) |
Air consumption (maximum (ft3/min)) |
|
Reciprocating Rotary |
900 750 |
15 at 85±5 psi 25 at 85±5 psi |
2.4 Air motor.
2.4.1 Reciprocating type. The reciprocating air motor shall be double-acting and shall transmit power directly to the reciprocating shaft.
2.4.1.1 Reciprocating shaft. The reciprocating shaft shall be attached to the air motor to form the reciprocating mechanism. The shaft shall have splines or flats to prevent rotation in the housing.
2.4.2 Rotary air motor. The rotary air motor shall be of the multivane type and shall transmit power to the reciprocating shaft through a rotary cam and positive acting cam follower.
2.4.2.1 Reciprocating mechanism. The reciprocating mechanism shall consist of a rotary cam, cam follower, and reciprocating shaft. Cam follower and reciprocating shaft shall convert the rotary action of air motor to reciprocating action for the saw blade. The rotary cam shall be supported at each end with sealed-for-life bearings. The reciprocating shaft shall have splines or flats to prevent rotation in the housing.
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