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Anonymous Poster

Shaft Deflection Measurement

08/16/2009 1:15 AM
Dear All,

We are looking to measure and record radial deflection in shaft while in rotation. The measurement should be around 10 reading per secound in range of 0.01 to 5 mm. Can any body suggest suitable method and required instruments for the measurement.

Thanks
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Anonymous Poster
#1

Re: Shaft Deflection Measurement

08/16/2009 2:22 AM

Hold a mirror surface (and a dial indictor plunge micrometer, temporarily) -- against the rotating shaft (think spring), bounce laser off mirror to a sufficiently distant target and mark off on the target the range of indications, calibrating image movement range with dial indicator in static mode. Use high speed film or digital camera to record laser movement at speed. Read deflection at your leisure with playback at slow speed.
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user-deleted-1105
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Popular Science - Weaponology - New Member United Kingdom - Member - New Member

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#2

Re: Shaft Deflection Measurement

08/16/2009 3:34 AM

How fast is it rotating?

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Anonymous Poster
#3
In reply to #2

Re: Shaft Deflection Measurement

08/16/2009 12:03 PM

The shaft is rotating at 50 RPM max, Instrument may be contact or non-contact type. If we hook up computer to instrument to record the data - will be of great help.
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user-deleted-1105
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Popular Science - Weaponology - New Member United Kingdom - Member - New Member

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#4
In reply to #3

Re: Shaft Deflection Measurement

08/16/2009 12:09 PM

One of those sychronous mains motors driving a paper drum, with a pencil attached would do it, a bit like a barograph.
low tech is good.
Del

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otha
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#5

Re: Shaft Deflection Measurement

08/31/2009 7:16 PM

Are you trying to read shaft vibration or rotor sag?

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