In the 1960s, with the development of battery manufacturing technology, there was a battery-type power tool without a power line using a nickel-cadmium battery as a power source, but at that time it was slow to develop due to its high price. In the mid-to-late 70s, due to the lower battery price and shorter charging time, this power tool was widely used in Europe, America, and Japan. The power tool was originally made of cast iron as the outer casing, and then changed to aluminum alloy as the outer casing. In the 1960s, thermoplastic engineering plastics were used in power tools and double insulation of power tools to ensure the safety of power tools. Due to the development of electronic technology, electronic speed control power tools appeared in the 1960s. These power tools use electronic components such as thyristors to form electronic circuits, and the rotation speed is adjusted by the depth at which the switch knobs are inserted, so that the power tools are in use. Different speeds can be selected according to the different objects to be processed (such as different materials, diameter of drilled holes, etc.).