How can a drill bit be loaded?
in other words, the thicker copper foil and more copper The foil is more difficult to drill when the copper foil layer increases the degree of wear on the drill also increased, especially the wear of the blade, in addition, with the copper foil thickness and the increase in the number of broken needle The possibility also increased.
it is in the cutting resistance (including torque and thrust ) Are several times the substrate, and even cutting is also relatively long, so the substrate machinability changes
It is necessary to change the drilling operating conditions, and even the shape of the drill and the manufacturing material should be modified to meet the special requirements of the copper part of the (including the inner) of the drilling is particularly difficult
he cross-sectional area of ??the drill pipe decreases as the diameter of the drill pin decreases, and the removal ability of the cuttings is gradually decreased, and the shape and cutting resistance of the cuttings are changed depending on the material of the circuit board
