Trepaning is a laser drilling process similar to a cutting process. Therefore, the hole diameter is not limited by the the beam. This 1-pass process allow us to achieve the best hole quality but unfortunately, the processing speed is higher. Tolerances in the range of ±5um are reachable on thin material.
The laser beam is focused on a diameter at least 3 times smaller than the diameter of the required hole. The beam will be displaced in a circular manner, either by means of a rotary optics (or trepaning head) or by displacement of the workpiece or Of the laser beam. Trepanation allows us to obtain cylindrical holes of excellent quality as well as precisions in the range of 5 μm.
Process well-established in medical, aeronautic, watch and automotive industries. Due to the high quality and the lower investment cost, it seems like this Art of Drilling is almost common nowadays.