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Basic knowledge on the use of drill bits
- Jan 09, 2018 -

1. Drill bit should be installed in a special package, to avoid vibration collide with each other.

2. Usually 40 times the stereo microscope can be used to check the drill cutting edge wear.

Measuring the diameter of the drill Use a non-contact measuring instrument such as a tool microscope to prevent the cutting edge from touching the mechanical measuring instrument and being bruised.

4 fixed shank drill bit holder on the chuck length of 4 to 5 times the diameter of drill shank to clamp.

5. Drilling the vacuum effect is better, vacuum wind can reduce the bit temperature, colleagues take away the dust to reduce the friction temperature.

6. Always check the spindle presser foot. The presser foot contact surface should be horizontal and vertical to the spindle can not be shaken, to prevent the drill cut and cut holes.

7. Order a manufacturer's drill, factory inspection to sampling 4% of its compliance. And 100% with 10 to 15 times the microscope to check its nicks, abrasions and cracks.

8. The drill bits are scrapped when their wear diameter is reduced by 2% due to wear.

9. Some CNC drilling machine use the positioning ring Some CNC drilling machine does not use the positioning ring, such as the use of the positioning ring when it is installed in the depth of positioning must be accurate, such as the use of the positioning ring to install the drill bit on the spindle to adjust the elongation Consistent, multi-spindle drilling more should pay attention to this point, to make each spindle drilling depth to be consistent. If inconsistent it is possible to drill bit to the table or can not drill through the circuit board scrapped.