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prvn619
Associate

Join Date: Jul 2011
Posts: 42

How to Check Linearity of this Vibration Probe?

05/15/2013 2:56 AM

I have a Axial Displacement Probe and the Bentley's TK-3 kit for checking the lineraity of the probe. But the Target plates that are available with me are of different material than that of Pump's shaft material. Is there any other way to check the linearity of these probes?
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PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: How to Check Linearity of this Vibration probe?

05/15/2013 3:22 AM

Probably. Didn't the equipment manufacturer respond during the telephone call? How strange.

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leveles
Guru

Join Date: Jan 2008
Posts: 1753
Good Answers: 59
#2

Re: How to Check Linearity of this Vibration Probe?

05/15/2013 10:45 PM

YES. Virtually all odd test equipment makers will calibrate for you.

Contact them.
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decker1
Active Contributor

Join Date: Dec 2011
Location: Alberta Canada
Posts: 23
#3

Re: How to Check Linearity of this Vibration Probe?

05/18/2013 2:26 PM

You could build a bracket and mount the micrometre to the shaft and use it for the target or have a machinist make you a target out of the same material as the shaft.
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67model
Guru

Join Date: Dec 2010
Posts: 1686
Good Answers: 116
#4

Re: How to Check Linearity of this Vibration Probe?

05/21/2013 12:31 PM

You could push the shaft up to minimum probe gap. Measure the gap with feeler gauges. Record Bently readout.

Fix a dial gauge or vernier gauge against the shaft face, take a reading.

Move shaft away, read gauge again, read Bently. Gap is feeler gauge reading + change of dial gauge from first position.

Continue till shaft is at maximum gap.

Plot graph of gap versus Bently readout.

You can screw the probe out on its thread, to change the gap, but it takes time and not twisting the cable is a problem.
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