Parker Products OEM650X - Manual (Page 30)

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OEM650/OEM650X • INSTALLATION
Couplings
The motor and load should be aligned as accurately as possible. Any
misalignment may degrade your system’s performance. There are
three types of shaft couplings: single-flex, double-flex, and rigid.
Like a hinge, a single-flex coupling accepts angular misalignment
only. A double-flex coupling accepts both angular and parallel
misalignments. Both single-flex and double-flex, depending on their
design, may or may not accept end-play. A rigid coupling cannot
compensate for any misalignment.
Single-Flex Coupling
When a single-flex coupling is used, one and only one of the shafts
must be free to move in the radial direction without constraint. Do
not use a double-flex coupling in this situation; it will allow too
much freedom and the shaft will rotate eccentrically, which
will cause large vibrations and immediate failure.
Double-Flex Coupling
Use a double-flexed coupling whenever two shafts are joined that are
fixed in the radial and angular direction (angular misalignment). Do
not use a single-flex coupling with a parallel misalignment;
this will bend the shafts, causing excessive bearing loads and
premature failure.
Rigid Coupling
Rigid couplings are generally not recommended. They should be
used only if the motor is on some form of floating mounts, which
allow for alignment compensation.