Accession Number:

ADB006930

Title:

Effect of Bearing Defects

Descriptive Note:

Technical rept. Nov 1971-Nov 1974

Corporate Author:

MPB CORP KEENE NH

Personal Author(s):

• Beecher, Colby G.

Report Date:

1974-12-01

Pagination or Media Count:

234.0

Abstract:

This program determined the relationship between selected raceway surface defects and performance and life of miniature ball bearing. The first phase of this two phase program developed the test plan for utilization in the second phase test and evaluation effort. Nine defect types were tested at various levels Comet-Tail, Dig-Nick, Dirt Brinell, Grind-Skip Lines, Impingement, Orange Peel, Pit, Scratch and Liney Finish. Bearing selected was 516 OD x 18 ID MPB PN S518MCK in tolerance grades ABEC 1, ABEC 3, and ABEC 7P. Performance tests included starting torque, low speed running torque and vibration. Life tests utilized air driven turbine test rigs operating at 16,000 rpm with 2 lbs. axial load. Bearings were lubricated with KG-80 oil MIL-L- 83176. Conclusions are that performance characteristics were influenced to a greater degree than were bearing life times. A specification for defect limitation is presented based on performance and life test times. A specification for defect limitation is presented based on performance and life test evaluation.

Descriptors:

• *BALL BEARINGS
• VIBRATION
• LIFE EXPECTANCY(SERVICE LIFE)
• SPECIFICATIONS
• PERFORMANCE(ENGINEERING)
• TEST METHODS
• SURFACES
• DEFECTS(MATERIALS)
• SURFACE PROPERTIES
• STANDARDS
• STATISTICAL ANALYSIS
• LIFE TESTS
• LUBRICATION
• TORQUE
• MINIATURIZATION

Subject Categories:

• Machinery and Tools

Distribution Statement:

APPROVED FOR PUBLIC RELEASE