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fluffyandy62  
#1 Posted : 29 July 2014 16:33:44(UTC)
Rank: New forum user
fluffyandy62
I am trying to explain HAV figures to operators at my place of work. We use hand-held polishing guns with a manufacturing rating of 6m/s2, does anyone have a simple way to explain this please?
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Bigmac1  
#2 Posted : 29 July 2014 20:38:22(UTC)
Rank: Super forum user
Bigmac1
Turn it into a daily trigger time and give it in minutes, workers will understand the unit of time. Don't forget to double manufacturers magnitude or measure it accurately. Stick the trigger time on each piece of equipment and get operators to record times of usage on a former.
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Salis  
#3 Posted : 30 July 2014 08:21:38(UTC)
Rank: Forum user
Salis
Don't rely on the manufacturers rating, this can change drastically depending on materials they are used on.

Get a simple Havs meter, example
http://www.arco.co.uk/products/55H9350 or you can hire one (SpeedyHire).

A lot of good stuff here: http://www.hse.gov.uk/vi...on/hav/vibrationcalc.htm
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fluffyandy62  
#4 Posted : 30 July 2014 11:59:50(UTC)
Rank: New forum user
fluffyandy62
Thank you both I will look on the sites suggested. I have started using a point system that equates into time i.e. one point for 20 minutes on the gun. Using this method against targets and hours worked in the week I have worked out that last week’s actual average times on the guns was 12%.

Thanks again.
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Canopener  
#5 Posted : 31 July 2014 12:25:02(UTC)
Rank: Super forum user
Canopener
I am not quite sure what you are actually trying to explain to them but I would have thought that something along the lines that vibration exposure is a combination of the LEVEL of vibration and the LENGTH of time exposed. The higher the vibration level and/or the longer the time exposed to that vibration, the greater the risk of suffering from vibration related conditions such as HAV etc etc.

However, using an acceleration figure isn’t always that meaningful to many, so you can use the HSE tools freely available on their website to convert this into exposure points and then calculate when the EAV/ELV would be reached. I use the tool to make a ‘ready reckoner’ for each tool.

Hope that makes sense/helps
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imwaldra  
#6 Posted : 31 July 2014 16:54:58(UTC)
Rank: Super forum user
imwaldra
Note that HSE guidance now says that recording trigger times for everything is possibly over the top. Once you have the evidence about typical exposures, if they are miles away from the lower limits, then no need to worry much about 'routine' exposures, only those that unusually high.

Your low level monitoring via annual questionnaire, etc. would pick up any cases where exposures have risen.
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