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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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Questions?

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
mhowell@easa.com

ANSI Accredited Standards Developer Information

Clearance and interference coupling fits: Tips on when to use and how to determine tolerances

  • July 2009
  • Number of views: 9864
  • Article rating: 4.0

Tom Bishop, P.E. 
EASA Technical Support Specialist 

Couplings (see Figure 1) for connecting shafts can be placed in two categories: keyed and keyless. Similarly, the fits of couplings to shafts can be categorized as clearance or interference. A keyless coupling arrangement will always have an in­terference fit, while a keyed arrange­ment may have either a clearance or an interference fit. This article will focus on determining when to use a clearance or an interference fit, and how to obtain the tolerances for the resulting fit. Since we are dealing with existing shafts and couplings, the category of keyed or keyless has already been established and will not be considered. 

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Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 13: Motor Alignment, Vibration & Noise

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 13: Motor Alignment, Vibration & Noise

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EASA Rewind Study cover

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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