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Posted By Buzz
Can anyone comment on whether manufacturer's information on vibration levels is becomming more accurate these days and if so, whether doubling the m/s2 figures is something we should still be doing or is it just better to get the kit monitored in the first place for accurate magnitudes?
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Posted By Ron Hunter
HSE's own guidance points to use of a doubling of manufacturer's figures. Seems reasonable to work on that basis, at least until proper field measurements can be carried out; or where more accurate, valid information cannot be obtained elsewhere.
Quite often manufacturer's data can be termed "accurate" as the measurements have been conducted in accordance with the relevant EN/ISO Standard.That doesn't necessarily make them "meaningful" in real life/real use situations though!
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Posted By Phil Rose
As Ron says the doubling is an HSE recommendation. I went to a vibration seminar run by EFF/HSE a couple of years or so back and the HSE 'guru' said that vibration measurements were in general not very accurate or reliable and that the same piece of kit could have the vibration measured on a number of consecutive occasions with considerable variation in the results. So, you might find that doubling the manufacturers data may be a reasonable way forward and unless you have reason to believe that the vibration levels are in reality considerably less then you may want to save your money and use already published data.
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Posted By Seamus O Sullivan
At a seminar I attended a few months ago, a student gave the results of her research, she found ....
the manufacturer's data did not reflect the true levels,,,,,
and found that the levels differed between operators.
So you should not rely on the manufacturer's data. I suppose it is like being told the fuel consumption for a car, it varies due to many factors.
Of course another factor is that the levels will deteriorate as the machine gets older, and worn.
Just to add more discussion, should all equipment be checked for vibration levels??? If not, why not???
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Posted By Larry
The ISO standard used does not give a true figures. Too many adjustable variables.
Quick answers
1. NO. Avoid/run away from/steer clear of manufacturers figures. Double them, but only as an interim measure.
2. Yes. Get "true" figures.
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Posted By Colm Sharkey
Lads
Are you aware that a new EU standard came into law in 2006, Which get over the on site measuring. EN60745 is the latest revision take measurements in all three axes into account, under laboratory conditions comparable to real-life conditions. The employer may use these trlaxial vibration values for preliminary assessment of vibration exposure for his employees. Where their is no triaxial vibration values are available the value can be estimated as follows,
Take the single-axis vibration value given in the operating instructions
Multiply it by 2 ( for rotary and combi-hammers and reciprocating saw) or by 1.5 for all other tools. This is your new real life measurement.
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Posted By Larry
BUT. How do you calculate the vibration figure from part worn tools.
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Posted By Bob Youel
Its the personal dose to the individual person concerned that counts [I have attended enough claim cases to appreciate the situation] and such dose measurements are only obtainable if on site monitoring takes place in 'real' working conditions
Years ago [midd 1990's] grinders & jack hammers were hung from string etc / mowing machines were used over special grass so as the levels obtained were indicating 'low' - I know because I was present during such tests!
All the above said please use common sense
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Posted By ian cowe
We've had our hand held powered equipment tested on a number of occasions by a specialist consultant and in some cases the readings have indeed been almost double those quoted by manufacturers.
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