If it is not started in time, the cone will fall off; the diamond bit will cause cracks and breaks in the diamond composite sheet on the bit due to the heterogeneity of the formation. If it is inconsistent, it may cause the drill bit to drill to the table or fail to drill through the circuit board, resulting in scrap. 

If the clamping force is not good, the actual speed will be different from the actual speed. Some CNC drilling machines do not use positioning rings. The clamping length of the fixed shank drill bit on the spring chuck is 4 to 5 times the diameter of the drill shank to be clamped firmly..Talking about the correct use method of roller bit.  Consistent, multi-spindle drilling machine should pay more attention to this point, so that the drilling depth of each spindle should be the same.

Poor concentricity will cause small-diameter drills to break and large apertures. The drill bit should be packed in a special packaging box to avoid vibration and collision. If positioning rings are used, the depth positioning during installation must be accurate.If positioning rings are not used, the elongation of the drill bit on the spindle must be adjusted. Some CNC drilling machines use positioning rings.

At ordinary times, a 40x stereo microscope can be used to check the wear of the cutting edge of the drill. Frequently check the concentricity of the spindle and the collet chuck and the clamping force of the collet.The set speed does not Custom Forstner Bits match, slipping between the chuck and the drill.

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 contacting with the mechanical measuring instrument and being bumped. When using, take out the drill bit from the packing box and put it into the spring chuck of the spindle or the tool magazine of the automatic drill bit, and put it back into the packing box when it is used up

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