Strobes allow you to inspect a running machine in detail,
also known as a “slow motion study”. The first step is tuning the strobe light
to 1x, which should be at least roughly available. When you get there with the
strobe, the shaft will appear to stop. If it is on a VFD, you can estimate the
RPM use the following formula:
RPM ~ VFDOUTPUT
x [2xLFHz / # of Poles]
Once you know the speed, tune it slightly away from that
frequency and components will appear to rotate in slow motion, allowing for
inspection of couplings, belts, fan rotors, pulleys and much more.
This tip is provided by Scott Dow, Senior Instructor of Mobius Institute.
Come back to our blog next week to read #8 in our Top 10 Reasons Why a Strobe Light is an Analyst's Best Friend. To learn more about IMVAC and the event nearest to you, visit vibrationconference.com.
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