15. EQUIPMENT AND TOOLS 72 Handle the grinding machine with care. If the grinding machine gets hit, it might produce small almost invisible cracks in the grinding disc, which will result in breakdown of the disc under operation. There is a safety guard on the machine and it must not be removed. Always make sure that the rotating speeds of the machine and disc match. The rotating speed has been marked on the reference plate of both the machine and the grinding disc. Store the grinding discs in such a way that they can’t break, e.g. in a toolbox. Be careful when putting them into the toolbox. Note also that discs have an expiry date, and they must be used before that ‘’best before’’ date. Don’t use compressed air to clean clothes you are wearing. Don’t clean your overalls with oxygen.
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