HEALTH & SAFETY


be taken into consideration when it comes to reducing the level of vibration exposed by operators. Are they the right size and power for the task? Reducing the weight of a tool and the distance it must be carried can reduce HAV injury risks, but an underpowered tool may encourage operators to use greater pressure, or force them to hold the tool for longer, increasing pressure. Selecting the right abrasive is an essential part


of reducing tool vibration. For a lot of people, abrasive discs and wheels all look the same, but do not let looks fool you! The development of abrasives has exploded during the last decade and manufacturers now offer abrasives of various types and grit sizes in different types of substrates for different applications.


What tool features should you look for?


added to give a cumulative picture of an entire working day and the limits permitted. Once you have taken these questions into


account, various practical methods can be undertaken to minimise vibration. Where possible, seek to remove or reduce the use of vibrating tools or work processes; for example, use alternative non-vibrating methods such as jigs and clamps to avoid or minimise the need to hold vibrating tools or workpieces, and automate tasks where possible. Organising work schedules and rotating staff


can also limit the amount of time each worker spends exposed to vibration. Tool selection is another factor that needs to


Firstly, we need to consider the quality of abrasives, as this can be extremely variable. Always ensure that products are clearly labelled with maximum operating speeds, shelf life, and compliance with relevant manufacturing standards. Purchasing low-cost abrasive products might seem like a good idea, but when you consider the risks of exposure and subsequent staff absenteeism, not to mention the cost to regularly replace products, it is going to cost a lot more money in the long run. Secondly, it is important to look for abrasives


that cut faster and require less operator pressure. The use of high-performance abrasives can reduce overall vibration by allowing tasks to be


completed faster, with less operator trigger time. This can then be turned into a quantifiable cost- saving. In addition, this can also help to reduce operator fatigue which can play a significant part in overall productivity. When it comes to abrasive products, there is


not a “one size that fits all” so it is important not to opt for the simple, generic approach. Coated abrasive belts can produce less vibration than bonded wheels on fixed machinery whereas bonded wheels can be replaced by fast cutting and long-life fibre discs on hand-held angle grinders. Therefore, it is also important to consider the


grain used in the abrasive product. Conventional ceramic abrasive grain is irregular and blocky in shape which can occasionally present issues. Instead of a clean, machining action, the grain tends to “plow” through the metal, causing heat to build up in the workpiece and the abrasive, which can result in a slower cut, shorter belt life, and undesirable effects. An abrasive that stays sharp is key. To address


this issue, the 3M Cubitron II range of abrasives, available from Brammer Buck & Hickman, features a revolutionary precision-shaped ceramic grain technology. As the triangular- shaped grain wears, it continually fractures to form sharp points and edges that slice through metal, wear evenly, and provide long life and consistency at any grinding pressure.


ConClusion


Without a doubt, HAV can have serious consequences for both the operator and the employer and as a result, there needs to be a fine balance between safeguarding the workforce and maintaining productivity. Looking at ways to reduce or substitute tasks involving high levels of vibration is important, with the most effective being to consider what tools and abrasive products are being used. For more information on the regulations visit: at


www.hse.gov.uk/vibration/hav/regulations.htm. The full text of the regulations can be accessed at www.opsi.gov.uk/si/si2005/20051093.htm.


Brammer Buck & Hickman uk.rubix.com


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