Do not keep engraving machines constantly working for over than 10 hours. Cool water for spindle should be clean. Do not let spindle motor lack of water. Change the cool water regulary to prevent the motor from overheat.
After using engraving machine, clean dust on table and transmission system. Lubricate XYZ axis once or more a week. Even if machine is infrequently used, it also should be idled and lubricated periodically in order to remain it flexible.
Check if there is dust in electric cabinet and if screws are loose to assure it’s safe and reliable.