Any grinding wheel has its certain use wear requirements to wear to a certain extent it is necessary to replace the new wheel. Not in order to save material, ultra require the use of wear and tear, which is an extremely unsafe illegal behavior. The general provisions of the new grinding wheel when the wheel wear to the large diameter of 10mm in diameter than the chuck should be replaced.
        Brought out from the Treasury are not necessarily qualified wheel grinding wheel, and even buy from the manufacturers of the new wheel is not necessarily qualified wheel. Any abrasive wheel has its valid use within the expiration date, it is qualified grindstone; than valid, it may not necessarily be qualified wheel. Rules of order of the grinding wheel should be used within the validity period, resin and rubber bonded grinding wheel storage after one year must be approved by the rotation test, successful applicants before use ".
        Wheel local crack during use, should immediately stop using the re-replacement of the cutting wheel, to avoid wheel broken.