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#1 Posted : 27 February 2004 11:09:00(UTC)
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Posted By Gavin Barr I need some advice. We have 4 Twin Pedestal grinding machines (27000 rpm). They all have top guards covering the full length of the grinding belts and part way down the sides. New top level management have come and told the factory manager to fully guard down the sides of the machine. So doing as he was told, he had guards fitted. I was asked to review the risk assessment of the machines with the new guards on and found that these stop access to the sides, but should an accident occur they will increase the injury sustained because the hand or arm will be held against the guard causing untold damage or even amputation until the emergency button can be pressed Without these guards, if an accident happend the hand would be pulled through and released after half a turn resulting in a couple of broken fingers and/or abrations at the worst. Can anyone tell me the best course of action and advise if these guards should be removed.
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#2 Posted : 27 February 2004 12:07:00(UTC)
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Posted By Jane Blunt Without having seen the piece of equipment it is difficult to say, but it sounds as though there could be something fundamentally wrong with the design of the guarding of this equipment. In principle, I would not expect either of your stated outcomes to be acceptable. There is an HSE booklet, HSG 17, 07176 17394, on the subject of abrasive wheels, but from memory I don't think this deals with the continuous belt type. The other document that is definitely worth a look is the British Standards Institute guidance PD5304: 2000, the safe use of machinery, which deals with guarding in more general terms. Jane
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#3 Posted : 27 February 2004 14:20:00(UTC)
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Posted By Kevin Irwin Gavin, is the belt the drive for the wheel or is it an abrasive paper belt? Its difficult to advise without seeing the actual machine.
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#4 Posted : 27 February 2004 14:30:00(UTC)
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Posted By Gavin Barr Hi Kevin, its an abrasive paper belt which is looped over a wheel which is attached to the spindle of the machine, the spindle then rotates at 27000rpm. I have explained the dangers already to the higher powers and they appear to have fallen on deaf ears. The twin pedestal is already a dangerous machine, used in just about every engineering company I know of, and in my opinion the added guard makes the machine more dangerous from point of view that if an accident did occure it will cause much more harm than without. Any advice on what to do would be greatly appreciated. And before anyone say's anything, yes we have looked at elimination and substituting the machine but there are hardly any sutable alternatives Many thanks Gavin
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#5 Posted : 28 February 2004 12:44:00(UTC)
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Posted By Stuart Nagle An interesting scenario that reminds of previous cases: John Summers & Sons - V - Frost (1955): whilst operating a power driven grinding machine Mr Frost's thumb slipped through a small gap between the guard and the grinding wheel. The House of Lords ruled this to a breach of statutory duty, as the duty under section 14 of the Factories Act 1961, to fence a dangerous part of machinery securely, was an absolute one. According to this descision, even if it is impossible to use a machine when it is securely fenced, then so beit. It is up to parliament to make regulations to modify this duty in special cases - in this case, the introduction of the Abrasive Wheel Regulations 1970. The requirements of section 12 of the Safety (General Provisions) part of the Factories Act was for the moving parts of any prime mover to be securly fenced (subject to certain exceptions where the parts could be rendered safe by construction or position). and it was left to case law to determine the term 'securely fenced'. The Provision and Use of Work Equipment Regulations 1992 (as amended) now apply in place of the Factories Act. However, the question is what effect would previous case law have on a decision and what is securely fenced? some precidents are binding and have to be followed, some are less stringent and only need consideration. The decision made in the case above was a binding decision, however other case law decisions have amplified specific points within the framework of the binding decision, for example is the purpose of a fence to contain parts of machine or prevent them from flying out, or prevent a person coming into contact with moving parts? In Nichols - V- Austin it was stressed that it was intended to keep people out, not keep parts in. So what constitutes a secure fence, for example when a tool shatters and parts come out injuring a person? This will determine the nature of the fence and its employment and positioning in relation to persons who may be effected. In your own case I would assume the grinding face of the belt is presently upwards, and so working on the belt surface is the correct manner in which the equipment is to be used. Access therefore to the side of the belt is not deemed as necessary nor is it deemed safe and could inherently cause damage to the belt, rendering it unsafe. Due regard needs to be given to this as although access is prevented to the moving parts at the side of the belt, you state that entrapment could occur. The motive therefore here would seem to be preventing an accident (and entrapment) and preventing access to moving parts where access should not be available. If the atsk requires access to a particular point on the belt, why is this and what is the safest method of achieving it, without endangering a person carrying out the task. It may well be that the guard provided should in fact not allow access to the side of the belt at all, e.i. be even closer than at present, to prevent such entrapment, so far as is reasonably practicable, or of a different design, configuration or material so as to prevent an accident and any entrapment. Food for thought.
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