A-A-50602
sized per MS1934/1-16XO16, Spherical bearings should be sized per MS14102-16. Tolerances specified in MS1934 and MS14102 are not required to be met for testing candidate bearings.
4.1 Material of construction. Examine materials used in construction and determine thicknesses of layers.
4.2 Radial static limit load. Determine the radial static limit load for a journal bearing as specified in the MIL-B-81934 radial static load test. For spherical bearings the radial static load test specified in MIL-B-81820 axial static load test. The radial static limit load and permanent set shall be as defined in 2.2.
4.3 Axial static limit load. Determine the axial static limit load on a spherical bearing as specified in the MIL-B-81820 axial static load test. The axial static limit load and permanent set shall be as defined in 2.3.
4.4 Self-alignment requirement. Spherical bearings must be self-aligning as defined in 2.4.
4.5 Friction. Preload a journal bearing to 5000 psi (based on projected area) in ASTM D 1141 synthetic seawater, and determine the frictional coefficients by measuring the breakaway torque.
4.6 Wear. Determine wear by the following procedure using a test rig in accordance with 4.6.1.1.
4.6.1 Procedure. Load the samples to 1000 psi based on projected area. Oscillate the shaft at plus or minus 45 degrees for 100,000 cycles. One cycle shall consist of a shaft rotating from zero to plus 45 degrees, return through zero to minus 45 degrees, then to zero. Samples shall be tested at a rate of 20 cycles a minute minimum. Load new samples to 5000 psi. For these samples, oscillate the shaft at plus or minus 45 degrees for 20,000 cycles. Determine the wear in these samples by comparing before and after thicknesses.
4.6.1.1 Use a test rig similar to the one specified for radial static limit load testing in MIL-B-81934 for journal bearings or MIL-B-81820 for spherical bearings. The test rig should be modified so the bearing under test immersed in ASTM D 1141 synthetic seawater. The bearing under test shall be installed into a steel housing using a class FN2 fit per ANSI B4.1. A hardened shaft (R 50 minimum) with a surface finish of 16 rms polished shall be used. The shaft shall be sized to provide a class RC6 fir per ANSI B4.1.
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