Check that the electrical lead has a current tag and is in good condition. Ensure that the guard over the grinding disc is correctly positioned to protect the operator from any flying pieces from a broken disc and sparks. Ensure that you are using the right sized disc for the size of the grinder (i.e., do not use a five inch disc on a four inch grinder). Ensure that you use the right disc for the material being cut (e.g. a steel disc for grinding steel, masonry disc for bricks etc.). Use only grinding discs for grinding (these are generally thicker) and the thinner cutting discs for cutting. Check grinding disc for broken areas or damage. Replace damaged disc immediately. Use only flanges specified for the machine. Position the machine so that the power cord always stays behind the machine during operation. Ensure personal protective equipment is available and used (i.e. safety goggles, apron and ear protection).