In the PCB drilling process may have the following quality problems:
1, partial hole, porous & leak holes;
2, broken drill bits;
3, blocking the hole (hole with debris);
4, no drill through;
5, burr hole, rough, smudge;
6, the surface burrs.

Here is a quick solution of pcb  drilling quality problems. The method is from 1 to last to  find out the problems.

1. Check the settings of drilling parameters are correct, mainly speed and lower speed. Confirmed whether it is setting or procedural issue.

2. If drilling parameters are right, put printed circuit boards on two machines(Note: to be the same machine model),and using the same or different settings of drilling to confirm the problem is the machine problems or procedural issues. As the probability is too less of the two machine have the same problems, then you can know the problem is the The equipment or procedural problems.

3. If the problems still have, replace of the raw materials and test materials.

4. If the problem still have, replace of the drill bit to test, generally the brand-name manufacturers drilling bits with less problems.

CMD Circuits have the strict quality control systems to ensure the quality of our producting, including rigid pcb, flexible pcb, aluminum pcb and all items. Please contact with us if you need any further information.