ANSI/EASA AR100-2020 cover

ANSI/EASA Standard AR100-2020
ANSI/EASA AR100-2020: Recommended Practice for the Repair of Rotating Electrical Apparatus is a must-have guide to the repair of rotating electrical machines. It establishes recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

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For information about ANSI/EASA AR100 or questions about the work on this standard, contact:

Mike Howell, PE
EASA Technical Support Specialist
+1 314 993 2220
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ANSI Accredited Standards Developer Information

Sleeve bearing clearance depends on many factors

June 2016
Number of views: 14196
Article rating: 2.7

By Chuck Yung
EASA Senior Technical Support Specialist

It’s fair to say that one’s outlook on life is colored by experience. A good example of this with sleeve bearing motors is the question, “What’s the proper clearance between a shaft and the sleeve bearing it rides in?” Chances are each of us has a rule of thumb for this, probably related to shaft diameter. Some of these may look familiar:

One thousandth, plus 1 per in. of diameter
Two thousandths, plus 1 per in. of diameter
0.0015 in. per in. of diameter
0.002 in. per in. of diameter

They can’t all be right, yet many of us may have used one of these rules (probably not the same one, either!) with great success. Which one, if any, is correct? The answer depends on the application.

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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100

Section 2: Mechanical repair

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual

Section 8: Bearings
Section 10: Mechanical

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)

Section 10: Bearings & Lubrication

Principles of Medium & Large AC Motors (IEC Standards)

Section 10: Bearings & Lubrication

Root Cause Failure Analysis

Section 6: Mechanical Failures

Mechanical Repair Fundamentals of Electric Motors

Section 6: Bearing Housing, Shaft Openings, Seals & Fits

Categories: Bearings, Sleeve bearings, Design/theory/application, Repair procedures & tips, Articles in industry publications, Plant Engineering

Tags: Sleeve bearings Clearance Shafts

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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.

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EASA Good Practice Guide

Good Practice Guide to Maintain Motor Efficiency
Based on the 2019 and 2003 Rewind Studies of premium efficiency, energy efficient, IE2 (formerly EF1) and IE3 motors

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