Posted By Paul Leadbetter Stevie While you must ensure that you obtain tri-axial figures (because that is how the limits are set), the reason for doubling manufacturers' data is that they will test their equipment under ideal conditions, following instructions to the letter. This is unlikely to happen in the real world and vibration levels are likely to be higher than the manufacturers would like you to believe. Paul

Posted By Ali I concur with you. It is easier to use the HSE guidance on HAV and their Table of values, which are based on actual measurements. Their HAV calculator is very useful too and works only online. There is also a "ready reckoner", which is useful if you don't have access to a computer in the field as it can just be printed off. It is possible to measure the emissions, but it is too complicated and slow a process, which is why I don't. Yes, the HSE do recommend that you double the figures obtained from the Ratings for the reasons given on this page. The HSE are slowly working on other tools & equipt, but their Table is quite a useful start. Ali