Although the normal use of an angle grinder will produce sparks and flying particles, you should be concerned if smoke is created during operation. This could be caused by the wheel becoming clogged due to a build-up of debris and rustor or maybe the two bearing surfaces which support rotor shaft are not in the same plane. .If you do notice smoke arising from the grinder, immediately switch it off and disconnect it from the power supply.
comment below if you have some question..
NOTE: im not a professional..
