The principle of operation of the handheld drill: power supplies (2) power supply via the boot switch parts and adjust the voltage (3) let out the line DC power supply related set of carbon brushes (4) power supply for the motor (5). When the rotary engine will transmit the motion transmission through (8) is for the shaft that contains the drill rotates the drill movements and created at the same time also do spin the fan (7) cooling for the motor when drilling.
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