In the 1960s, with the development of battery manufacturing technology, battery-type power tools without power cords using nickel-cadmium batteries as power sources appeared. But at that time, the development was slow due to the high price. By the mid-to-late 1970s, due to lower battery prices and shorter charging times, this type of power tool was widely used in Europe, America and Japan. The power tools were initially made of cast iron, and later changed to aluminum alloys. In the 1960s, thermoplastic engineering plastics were used in power tools, and double insulation of power tools was realized to ensure the safety of power tools. Due to the development of electronic technology, electronic speed-regulated power tools also appeared in the 1960s. This kind of power tool uses thyristor and other components to form electronic circuits, and adjusts the speed by the depth of the switch button, so that the power tool can be used according to the different objects to be processed (such as different materials, hole diameter, etc. ), select a different speed.
