How to measure the rotor of a torch drill
Indirect measurement: installation of a reel is fixed on the drum of a string in the head, use electric drill 2~10 seconds, according to the length of the winding rope drum rotation speed to calculate the rotation speed for electric drill in this period of time, to calculate the speed of.
Direct measurement: the tachometer is connected directly on the rotor for direct measurement.
Differential measurement: a disc is mounted in front of the rotor, and the disc is uniformly painted black and white in accordance with the synchronous speed of the motor.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. The utility model relates to a hand drill, which is a small drilling tool convenient for carrying, comprising a small motor, a control switch, a drill chuck and a drill bit.
