precision shaft alignment Flashcards
what is a flexible coupling used for
when connecting the shaft of a driver, to another independently mounted component
elastomeric coupling
has a rubber like, flexible component to seperate the two coupling hubs
what are some important characteristics of elastomeric characteristics
less expensive than metal couplings
require no lubrication
torsionally soft
dampen vibration
incompatible with some chemicals
flexible metal coupling
type of coupling that has a flexible component that is made of metal
what are the three main types of available elastomeric couplings
elastomer-in compression
elastomer-in-shear
combination shear and compression
Elas-in-compression
places the elastomeric element in compression to transmit the load between the two coupling hubs
elas-in-shear
places the elastomeric element in shear to transmit the load between the two hubs
can accept more misallignment
combo shear and compression
designed for sever misalignment applications
consists of an elastomeric element with a set of gear teeth on each end that inserts into two coupling hubs which have internal teeth
flange couplings
consists of two hubs that have flanges that bolt to each other
allows no room for misalignment
rim and face alignment method
measures the parallel and angular misalignment between the driver and driven coupling hubs
reverse indicator method
two dial indicators are used. one attached to each shaft and positioned to read the hub rim on the other shaft
what types of misalignment does the RIM take?
vertical angular and parallel
what is indicator sag?
an error in the indicator reading caused by the deflection of the indicator bracket by gravity
what is thermal expansion?
the increase in the outer dimensions of a component as a result of an increase in temperature
