Is there any understanding of the use of flashlights?
Hammer (hammer): drill holes in any material, the most widely used.The price of the 3 kinds of electric drills is arranged from low to high, and the functions are also increased. The selection of them requires the combination of their respective scope of application and requirements.
Impact drill: the impact mechanism of impact drill with ball type two and type. A ball impact electric drill consists of a moving plate, a fixed plate, a steel ball and so on. Brake disc is connected with a main shaft through threads, and with 12 balls; fixing by pins fixed on a casing, and a 4 ball, in the role of thrust, 12 ball 4 ball rolling along, the hard alloy bit to produce rotary impact motion, can drill a hole in the brick, brick, concrete and other brittle materials. The utility model can make the fixed disk rotate with the moving disk without impacting, and can be used as an ordinary electric drill.
Hand drill: the minimum power, the scope is limited to the use and when a electric screwdriver drill for wood, do not have much practical value.
