The electric drill is suitable for drilling on steel, wood and plastic, and is one of the most popular hand-held electric tools. In general, electric drills are sold in hardware stores ranging from professional hypermarkets to roadside hardware stores. In order to purchase a satisfactory electric drill, the following points should be paid attention to.

      1、 Electric drill products are compulsorily certified products specified by CNCA, so when purchasing, you should first check whether the tool has a 3C mark. The method of checking is generally: whether there is a 3C mark on the outer package of the tool or on the nameplate of the tool. If there is still doubt about this (because the manufacturer of electric drill fails to pass the annual supervision and review, CNCA suspends or revokes its certificate), you can go to CNCA's website, Check whether the 3C certificate of the tool is currently valid.

      2、 Generally, when purchasing electric drills, large companies with good reputation and influence should be selected because of their strong technical force, strict quality control and standardized after-sales service. Users with strong purchasing power can also purchase tools of international brands.

      3、 According to the needs of users, it is necessary to distinguish between household and professional tools. Since most electric drills are designed for professionals, it is necessary to distinguish between professional and general household tools before purchasing. Generally, tools for professional use are different from those for general household use in terms of power. Tools for professional use have a large power to facilitate professionals to reduce workload. Tools for general household use have a relatively small project and workload, so the input power of tools does not need to be large.

      4、 Observe the outer package of the electric drill. The outer package of the tools should have clear patterns and no damage. The plastic box should be firm. The buckle for opening the plastic box should be firm and durable.

      5、 Observe the appearance of the electric drill. The appearance of the tool should be uniform in color. The surface of the plastic parts should be free of obvious shadows, dents, scratches or bumps. The assembly dislocation between the shell parts should be ≤ 0.5mm. The aluminum casting coating should be smooth and beautiful without defects. The surface of the whole machine should be free of oil stains and stains. When you hold it with your hands, you feel better and the handle of the switch should be flat. The length of cable shall not be less than 2m.

      6、 Check the nameplate and instructions of the electric drill. The nameplate parameters of the tool shall be consistent with those on the 3C certificate. The detailed address and contact information of the manufacturer and manufacturer shall be included in the manual. The nameplate or certificate of conformity shall have the traceable batch number of the product.

      7、 Hold the electric drill by hand, switch on the power, operate the switch frequently by hand to make the tool start frequently, and observe whether the on-off function of the tool switch is reliable. At the same time, observe whether the TV and fluorescent lamps on site are abnormal. To confirm whether the tool is equipped with an effective radio interference suppressor.

      8、 The electric drill is powered on and operated for one minute. When it is running, it should be held by hand. The hand should not feel any abnormal vibration. Observe the reversing spark. The reversing spark should not exceed grade. Generally, when looking inside from the air inlet of the tool, there should be no obvious arc light on the surface of the commutator. There shall be no abnormal noise during operation.