Precautions on the Use of Drilling Bit for CNC Drilling Machine

CNC drilling machine is mainly used for drilling, reaming, reaming, tapping and other processing. Bit as an important component, in use, pay attention to the following:
1. Drill bit should be installed in a special box, to avoid vibration collision with each other.
2. When using, remove the drill bit from the box and install it in the spring chuck of the spindle or in the tool changer of the automatic replacement drill bit, and put it back in the box.
3. To measure the diameter of the drill bit, use a non-contact measuring instrument such as a tool microscope to prevent the cutting edge from being touched by contact with the mechanical measuring instrument.
4. Some CNC drilling machine using the positioning ring Some CNC drilling machine does not use the positioning ring, such as the use of positioning rings when the installation of the depth of positioning must be accurate, such as the use of positioning ring to drill bit installed on the spindle to adjust the elongation In the case of multi-spindle drilling, it is important to make sure that the drilling depth is the same for each spindle, and if it is inconsistent, it may be drilled to the table or cut through the circuit board.
5. Usually you can use 40 times the stereomicroscope to check the wear of the drill cutting edge.
6. Always check the concentricity of the spindle and the spring chuck and the clamping force of the spring chuck, concentricity is not good will cause a small diameter drill bit and large hole diameter and other circumstances, the clamping force will cause the actual speed is not good and Set the speed does not meet, skid between the chuck and the drill bit.
7. Dingbian bit in the spring chuck clamping length of the handle diameter of 4 to 5 times to clamp firmly.
8. Always check the spindle presser foot. The presser foot contact surface should be horizontal and perpendicular to the spindle can not shake, to prevent drilling and drilling in the hole.
9. Drilling machine better cleaning effect, dust can reduce the temperature drill bit, colleagues take away the dust to reduce friction to produce high temperature.
9, the substrate stack, including the upper and lower plate to the table in the drilling machine on a hole in a groove positioning system positioning firmly in place, the use of adhesive tape to prevent the drill bit on the tape so that the drill bit adhesion chip, Resulting in difficult chip removal and broken drill.
10. To order the drill bit, the factory inspection of the 4% of its compliance with the provisions of sampling and 100% with 10 to 15 times the microscope to check the gap, abrasions and cracks.
11. Re-grinding of drill bits can increase the use and re-grinding times of drill bits, prolong the life of drill bits, and reduce the production cost and cost.It is usually less than 0.2mm in the whole length of two main cutting edges measured by tool microscope. Re-grinding to wear away 0.25mm. Ordinary fixed-bit can be re-grinding 3 times, the shovel-shaped head of the drill can be re-grinding 2. Over grinding its quality and accuracy of drilling will be reduced, will result in the finished circuit board Excessive grinding effect is counterproductive.
12. When the wear due to wear and its diameter compared to the original reduced by 2%, then the drill scrap.
13. Bit parameter settings Under normal circumstances, manufacturers have to provide a drill bit of the plant’s drilling speed and speed of the parameters of the table, the parameter is only a reference, but also through the actual use of technology personnel to draw a line Actual speed of the drill bit and down speed parameters, usually the actual parameters and parameters of the difference between the reference but not too much difference.
Good use of the method can extend the life of the drill bit, processing to meet the requirements of drilling, but also can reduce unnecessary costs. Hope that the above considerations can help you better use of CNC drilling machine.

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