ISO 21940-32:2012

Current Revision
Mechanical vibration - Rotor balancing - Part 32: Shaft and fitment key convention

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Mechanical vibration - Rotor balancing - Part 32: Shaft and fitment key convention

PUBLISH DATE 2012

ISO 21940-32:2012 specifies one convention for balancing the individual components (shaft and fitments) of a keyed rotor assembly. This provides compatibility of all balanced components so that when they have been assembled the overall balance tolerance and/or vibration limit for the rotor assembly is met.

ISO 21940-32:2012 specifies that half-keys be used when balancing the individual components of a keyed rotor assembly. It also specifies a marking of the components balanced in accordance with the key convention used.

ISO 21940-32:2012 applies to rotors balanced in a balancing machine, in their own bearings or in situ. The key convention can also be applied when measuring the residual unbalance and/or vibration of rotors with keyways, but to which fitments have not yet been assembled.

In addition to applying to keys of constant rectangular or square cross-section mounted parallel to the shaft centreline, ISO 21940-32:2012 also applies to:

  • keys mounted on tapered shaft surfaces
  • woodruff keys
  • gibhead keys
  • dowel keys
  • other special keys

The principle of the half-key convention is applied as is appropriate to the particular shape and location of the special key.

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