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High-speed machine tool spindles and the high-pressure turbopumps that move liquid hydrogen in the space shuttle are just two examples of the uses for hybrid roller bearings. ASTM Subcommittee F34.01 on Rolling Element has now developed a standard for hybrid roller bearings, ASTM F2730/F2730M , Specification for Silicon Nitride Cylindrical Bearing Rollers. Subcommittee F34.01 is under the…
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With the proposed new standard, WK11023 , Practice for Life and Reliability Testing Based on the Exponential Distribution, ASTM International Committee E11 on Quality and Statistics is continuing its program of preserving U.S. government military standards on acceptance sampling. WK11023 is an adaptation of the DoD quality control and reliability handbook document H-108, Sampling Procedures and…
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A new ASTM International standard, E 2555 , Practice for Factors and Procedures for Applying the MIL-STD-105 Plans in Life and Reliability Inspection, represents the latest work of a task group that is converting a series of old U.S. Department of Defense standards into ASTM documents. The task group is part of Subcommittee E11.30 on Data Analysis, which is under the jurisdiction of ASTM…
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A new ASTM International standard that covers annular ball bearings intended primarily for use in instrument and precision rotating components has been developed as a conversion of a U.S. military standard, MIL-B-81793F, Annular Ball Bearings, for Instruments and Precision Rotating Components. The new standard, F 2332 , Specification for Annular Ball Bearings for Instruments and Precision…
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ASTM International Committee E11 on Quality and Statistics has approved a new practice that describes methods for proficiency testing providers to use in analyzing laboratory results obtained in their programs. The standard, E 2489 , Practice for Statistical Analysis of One-Sample and Two-Sample Interlaboratory Proficiency Testing Programs, is under the jurisdiction of Subcommittee E11.20 on Test…
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ASTM International Committee F34 on Rolling Element Bearings is seeking participation in a new activity on measuring the cleanliness and wetability of bearing components. Because aerospace customers currently use many different methods of testing ball bearings, the goal of the activity is to work toward a consistent method for measuring cleanliness and wetability, as well as to analyze the…
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A former military standard has become the basis for a new ASTM standard developed by Committee E11 on Quality and Statistics. The new standard, E 2234, Practice for Sampling a Stream of Product by Attributes Indexed by AQL, will be the first in a series based on a now-withdrawn set of military documents on sampling. Practice E 2234, presently under the jurisdiction of Subcommittee E11.10 on…