First, how to change the drill

1. Disconnect the power supply of the electric drill, unplug the power cord of the electric drill from the socket, and place the drill bit facing upward smoothly.

2, the drill card head is to use a special key, when removing the drill, the special key is inserted in the drill card, the gear on the key and the gear on the drill card.

3, turn the special key, clockwise for tight, counterclockwise for loose. Change the bit needs to put on gloves (thick), and then pinch the rubber drill gourd mouth, counterclockwise rotation, you can complete the bit removal. The hand drill can be replaced with a new bit by turning it clockwise again.

Second, what are the precautions for the operation of the electric drill

1. Check whether the power cord is damaged before use. If so, it must be wrapped with insulation tape, and do not be soaked in water and dragged carelessly during use, and do not touch heat sources and corrosive media.

2, for the metal shell of the hand drill must take protective grounding (zero) measures.

3. Before use, make sure that the switch of the electric drill is in the off state to prevent the electric drill from turning suddenly when the plug is inserted into the power socket.

4. The drill should be idled for 0.5 ~ 1min before use to check whether the transmission part is flexible, whether there is abnormal noise, whether the screws are loose, and whether the commutator spark is normal.

5, when drilling, hold the drill with both hands, try not to operate with one hand, should grasp the correct operation posture.

6, can not use a notch drill, drilling the downward pressure should not be too large, to prevent the drill break.

7, clean the tool head waste, change the tool head and other actions, must be disconnected in the case of power.

8, for small workpieces must be clamped with the help of fixtures, and then use a hand drill.

9. The strength of drilling during operation should not be too large to prevent the drill or tap from flying out and hurting people.

10, before the operation to carefully check whether the drill crack or damage, if found to have this situation, it should be replaced immediately.

11. Pay attention to the rotation direction and feed direction of the drill bit.

12, turn off the power first, and then remove the workpiece from the tool until the drill is completely stopped.

13, do not contact the drill immediately after processing the workpiece, so as not to overheat the drill and burn the skin.

14, before the operation to carefully check whether the drill crack or damage, if found this situation, it should be replaced immediately.

15, in use, if it is found that the spark on the commutator is large, the drill is overheating, it must be stopped and checked, such as removing dirt, replacing the worn brush, adjusting the spring pressure of the brush holder.

16, in order to avoid cutting fingers, ensure that all fingers are removed from the workpiece or drill (tap) during operation.

17, when not in use should be timely unplug the power plug. Electric drill should be stored in a dry, clean environment.