Section 2: Basic Operation
27
Tips for Taking Measurements
• Measurements should always be taken using the machine
operating mode that is typical for that machine (the typical
load and running speed). This is to ensure that the loads on
the components, such as bearings, are the same as those
that define their wear. For multi-operating mode machines it
is best to take measurements when the loads on the
bearings are at a maximum and to take all future
measurements in the same mode.
• When taking the measurement, try not to lean on the
machine and do not put heavy objects (e.g. heavy tool
boxes) on it since this will change the vibratory behavior of
the machine.
• If there are machines operating nearby that might affect the
vibration of the machine you are measuring, stop those
surrounding machines if possible.
• In addition to the measurements that you will be taking, if
possible, stop and listen to the sound of the machine; look
for loose bolts and oil leaks; take note of any machine parts
that are vibrating visibly; feel for hot bearings and manually
‘feel’ the vibration (e.g. with a screwdriver) to look for
symptoms that might later aid vibration analysis. This should
be done only if it is safe to do so.
• If you have a stroboscope (not included in the vb kit) you
may wish to use it to ‘freeze’ rotating shafts, belts, couplings
etc to observe their operating shapes and relative speeds in
order to look for symptoms that might later aid vibration
analysis.
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