What is an electric drill
Electric drills are drilling tools that use electricity as power. It is a conventional product in power tools, and it is also the power tool product with the largest demand. The annual sales volume accounts for 35% of China's power tools. The main specifications of the electric drill are 4, 6, 8, 10, 13, 16, 19, 23, 32, 38, 49mm, etc. The numbers refer to the maximum diameter of the drill bit for drilling on steel with a tensile strength of 390N/mm2. For non-ferrous metals, plastics and other materials, the maximum drilling diameter can be 30-50% larger than the original specifications. Electric drill products used in households (DIY abroad) have lower requirements on service life, working efficiency, processing accuracy, etc., and the number of products is large, accounting for 70~80% of the total amount of electric drill products; another 30~20% Electric drill products belong to professional tools, that is, products commonly called 'industrial power tools' in China, which have higher technical requirements, including machining accuracy, reliability of use (such as time to failure, number of damages), service life, and performance level. (Such as torque, coaxiality), etc. are higher than household products. Double insulation technology provides a safe, reliable, and advanced insulation structure to prevent electric shock accidents for the use of hand-held power tools, which is the development trend of power tool safety technology. Since the 1960s, my country's power tool manufacturing industry has begun to study the application of double insulation in power tools, and trial-produced electric drills and other product prototypes. In 1998, double insulated power tool products accounted for more than 90% of the industry's annual output.