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Vibration help

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Vibration help

Post by KarlArmstrong01 » Fri Jun 21, 2019 9:37 am

Hi all,

Just a quick question,

Looking at vibration measurements for a rail saw. Front handle is 5.5m/s and the rear handle is 4.2m/s.

Do i add these together and take measurements as if it would be 9.7m/s or take them as 2 separate ones and add the exposure together? Both results are miles apart.


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Re: Vibration help

Post by Blackstone » Fri Jun 21, 2019 12:41 pm

HI Karl,

I've done a lot of work around vibration exposure to our employees but not seen a piece of equipment giving 2 values.

If you did it separately, based on 1 hour trigger time, using the HSE calculator is would be 2.4m/s2.
Adding together for 1 hour (put the at thingy in here) 9.7m/s gives 3.4m/s2.

So yes a big difference but i'm not sure which id use. My initial thought would be separate but not sure if that's the right way to do it.


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Re: Vibration help

Post by Penfold » Mon Jun 24, 2019 3:44 pm


We have done a lot of work with the HSE on Hand Arm Vibration management, to work out the exposure level you use the handle with the highest reading to work out the vibration magnitude and exposure levels, you don't add them together.

If you haven't already I would book onto a course in HAVS management, I used:


But there are plenty of good trainers out there who can get you through the basics, the HSL offer an excellent course

I hope this helps

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