Precautions for the Use of Drill Bits

1. The drill bit should be packed in a special box to avoid vibration scolliding with each other.

2. When using, remove the drill bit from the box should be installed in the spring chuck of the spindle or automatically replace the drill bit in the tool library. Run out and put it back into the box.

3. Measuring the diameter of the drill bit should be measured with non-contact measuring instruments such as tool microscopes to avoid the contact of the cutting edge with the mechanical measuring instrument.

4. Some CNC drilling machine sedituated ring some CNC drilling machine does not use positioning ring, such as the use of the fixed ring when the depth of positioning must be accurate, such as not using the positioning ring of its drill bit mounted on the spindle to adjust the length of the same, multi-spindle drilling machine more attention to this, to make each spindle drill depth to be consistent. Failure to do so can cause the drill to drill into the counter top or the inability to drill through the circuit board, resulting in scrapping.

5. Normally can use 40 times stereo microscope to check the wear of the cutting edge of the drill bit.

6. To often check the spindle and spring chuck concentricity and spring chuck clamping force, concentricity will cause small diameter drill break and aperture large and other conditions, clamping force will cause the actual speed and set speed does not meet, the chuck and the drill between the slip.

7. The clamping length of the fixed handle drill on the spring chuck is 4 to 5 times the diameter of the drill handle in order to clamp.

8. Check the spindle pressure feet frequently. The pressure foot contact surface should be horizontal and not wiggle vertically with the spindle, preventing break-out and deflection holes from being produced in the borehole.

9. The vacuuming effect of the drill is better, the vacuum ingress can reduce the temperature of the drill bit, while taking away the dust to reduce friction to produce high temperature.

10. The base plate stack inge layer includes the upper and lower pad platetos to be positioned and leveled in a one-hole, one-slot positioning system on the workbench of the drill. The use of adhesive tape needs to prevent the drill bit drill on the tape so that the drill bit adheres to the chip, resulting in difficulty in cutting chips and breaking the drill.

11. Order manufacturer's drill bit, enter the factory inspection to check its 4% compliance with the regulations. And 100% with 10 to 15 times the microscope to examine its gaps, abrasions and cracks.

12. Drilling bit timely re-grinding, can increase the use of the drill bit and the number of heavy grinding, extend the life of the drill bit, reduce production costs and costs. Usually measured with a tool microscope, the wear depth should be less than 0.2mm in the full length of the two main cutting edges. Grind 0.25mm when regrinding. The ordinary shank drill can be re-grinded 3 times, and the drill bit of the shovel (undercut) can be re-grinded 2 times. Too much grinding its drilling quality and accuracy will be reduced, resulting in the end of the line board finished products. Excessive turning is counterproductive.

13. When the wear diameter is reduced by 2% due to wear and the original, the drill bit is scrapped.

14. Drill parameters in general, manufacturers are providing a factory production drilling speed and down speed parameters table, the parameters are only a reference, the actual process personnel through the actual use to arrive at a realistic drill speed and down speed parameters, usually the actual parameters and reference parameters are different but not too much difference.

15. When drilling bit edge grinding, should try to make the two main cutting edge of the hemp drill grind symmetrically, so that the radial forces of the two main cutting edges offset each other, in order to prevent the drill bit bias and aperture expansion.