Common wrong use methods of power tools, these incorrect use methods affect the use effect and service life of power tools. 1. Forcibly stop the rotation with the brake device when the power tool is running at high speed. 2. During the use of the tool, excessive pressure is applied to the tool. 3. Use the tool beyond its purpose and ability. 4. Start machining the workpiece when the tool does not reach a constant speed after the tool is started. 5. Change the rotation direction of the working head before the tool is completely stopped. 6. The tool has been working in a dusty environment for a long time, and the tool has not been maintained in time to cause damage. 7. Foreign objects fall due to improper use or storage

59 companies, 60 products, 24 products did not meet the standards. In the third batch of 2010 national product quality inspections recently announced by the General Administration of Quality Supervision, Inspection and Quarantine, the quality problems of electric tools (electric drills, electric hammers, angle grinders) are still concentrated in small and medium-sized manufacturers.

Statistics from the China Electric Appliance Industry Association Power Tools Branch show that currently 85% of China's power tool products are used for export, and the domestic market only accounts for 10% to 15% of the market. In the domestic market, domestic companies are in an absolute leading trend in terms of market share, and more than 90% of the market is occupied by domestic products.