If the plane drill is used properly, it can increase the service life of the machine and reduce the cost. The matters needing attention in the use of the plane drill are as follows: < br style = "list style type: none;" / > & nbsp; & nbsp; 1. The drill bit of the plane drill should be packed in a special packaging box to avoid collision with the machine when it vibrates. During the use of the machine, the drill bit should be taken out from the packing box, and then put into the spring chuck of the spindle, and then put back into the packing box. The diameter of drill bit should be measured by non-contact measuring instrument such as microscope, which can effectively avoid the collision between cutting tool and mechanical measuring instrument.     4. Positioning ring is used by some CNC drilling machines, and some are not used. If the positioning ring is used, the depth positioning should be accurate during installation. If the positioning ring is not suitable for the machine tool, the extension length of the drill bit must be adjusted when it is installed on the main shaft. For some drilling machines with multiple main shafts, it is necessary to be more careful. If the positioning ring is not properly installed, the drill bit will drill to the table and be scrapped. The wear condition of the cutting edge of the drill bit can be checked with a 40 times stereomicroscope at ordinary times.     6. The concentricity of the spring chuck and the spindle should be checked frequently. At the same time, the clamping force of the spring chuck also needs to be checked from time to time, because if the concentricity is not good, the problems of small diameter drill bit breaking and large hole diameter will occur from time to time. However, if the drill bit and chuck slip, the set speed does not conform to the actual speed, it is due to the poor concentric force.