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Poll Results
 
 Do You Use Blake Chart in Your Vibration Analysis?
 Yes, very regularly. Perhaps every month. 0 0%
 Sometimes, perhaps a couple of times a year. 0 0%
 Rarely. I used it during the training and only a few times later. 4 36%
 Never. 7 63%
Total votes: 11   Please or sign up to vote.


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Shurafa2

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Posts: 170
Reply with quote  #1 
Do You Use Blake Chart in Your Vibration Analysis?

Michael P. Blake can be considered the originator of the Vibration Institute and there is a severity chart regularly used in the VI literature which is called Blake Chart after him.


Though it is mentioned in many legacy vibration references, personally, I did not see contractual documents referring to this chart. The nice thing about it is that you can see the three measures (displacement, velocity, and acceleration) on the same chart. A link to sample chart is below:

http://shorturl.at/rwxB5

I just wonder if this chart is recognized by current practitioners. Do you/your team use it?

Regards- Ali M. Al-Shurafa
OLi

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Posts: 1,918
Reply with quote  #2 
Maybe w/o knowing but basically never heard of that. Sorry. My father referred to  another oldie, was it Rayleigh chart? Sorry if spelling is bad I will look it up.
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John from PA

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Reply with quote  #3 
Quote:
Originally Posted by OLi
Maybe w/o knowing but basically never heard of that. Sorry. My father referred to  another oldie, was it Rayleigh chart? Sorry if spelling is bad I will look it up.


OLI, maybe "Rathbone"?  Go to http://vanguard-engineering.com/Public_Documents/Vibration%20Monitoring%20Presentation.pdf and examine slides 3 through 6.
John from PA

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Posts: 963
Reply with quote  #4 
I was aware of it but never really used it...

See http://www.vibration.org/Presentation/Sept%202011/Machine%20Vibration%20Standards%20-%20Part%202%20-%20Absolute-General.pdf for a presentation on the various charts that people use.

Worth a download;
there is a good vibration "history" document at http://www.sandv.com/downloads/0701mitc.pdf.  Go to PDF page 7 (68 as numbered in the article) for a discussion of the Blake chart; bottom right corner, "Condition Assessment Standards". 
Walt Strong

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Posts: 889
Reply with quote  #5 
I have used the IRD, Blake and Rathbone charts prior to the ISO Severity Guide; starting in the late 60's. Certainly until I found the ISO Guideline; no Internet back then. I mostly use the ISO Guide for Severity, since it is now well known, and it is very simple for the nonpractitioner. We could argue/discuss it's merit. I have referred to the older charts for training classes that I have conducted, since they, at least, introduce or consider vibration frequency and integration. My pet peeve with any of these  severity charts is that people tend to believe them fully, and use them for machine purchase specifications, when they were intended for a guideline.

Walt
OLi

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Posts: 1,918
Reply with quote  #6 
Yes, Rathbone it was, maybe I am not that old? Or I got ISO-fied early.
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Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
http://www.vtab.se
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