What kind of material does the power tool case have?
An electric tool case is made of a variety of materials, such as plastics, cast iron, etc..
In 1895, the German overtone produced the world's first direct current drill. The outer shell is made of cast iron and can drill holes in the steel plate 4mm. Then there was a three-phase power frequency (50Hz) electric drill, but the motor speed failed to break through the 3000r/min. In 1914, there was a single-phase electric motor driven by a series of exciting motors, and the motor speed was over 10000r/min. In 1927, the power supply frequency of intermediate frequency electric tool 150~200Hz, it not only has the advantages of high speed single-phase series motor, and has the advantages of simple structure, reliable three-phase motor, but because the need if current supply is limited.
The outer shell is a physical structure, and the enclosure uses support, connecting motors, transmission mechanisms, switches, handles, and attachments to make it the complete outer structure of a complete power tool entity.
