A drill bit for use in forming holes in a printed circuit board (PCB) is disclosed. The drill bit includes a drill bit body having: a drill bit tip at a first end of the drill bit body; a flute winding about the drill bit body in a helix, wherein a helix angle of the flute is between 44 and 46 degrees in the vicinity of the first end and increases with increasing distance from the first end to between 49 and 51 degrees; and a land width of between 0.08 and 0.1 millimeters.

A rigid or semi-rigid MAP container includes microperforations at least 0.4 mm in length, with diameters between 20 and 300 microns that are uniform within +/10% through both the laminated rigid/semi-rigid and sealant layers of the container. The microperforations are created using one or more micro-drills rather than a laser. A backing support can be used to inhibit container deformation during drilling. The laminate can include an outer PET layer, and/or an inner sealant layer that includes polyacrylonitrile resin and/or polyester film. Initially, the lid is hermetically sealed to the base by the sealant layers, and is mechanically resealable to the base after initial use. The microperforations can be widely distributed or concentrated in target areas. The base can be divided into compartments that are in gas communication with each other or hermetically isolated with separate configurations of microperforations that are optimal for the expected contents of each compartment.

A rigid or semi-rigid MAP container includes microperforations at least 0.4 mm in length, with diameters between 20 and 300 microns that are uniform within +/10% through both the laminated rigid/semi-rigid and sealant layers of the container. The microperforations are created using one or more micro-drills rather than a laser. A backing support can be used to inhibit container deformation during drilling. The laminate can include an outer PET layer, and/or an inner sealant layer that includes polyacrylonitrile resin and/or polyester film. Initially, the lid is hermetically sealed to the base by the sealant layers, and is mechanically resealable to the base after initial use. The microperforations can be widely distributed or concentrated in target areas. The base can be divided into compartments that are in gas communication with each other or hermetically isolated with separate configurations of microperforations that are optimal for the expected contents of each compartment.

A drilling and tapping machine includes a power head assembly supported at a vertical orientation, a parallelogram arm structure including a head support and an arm base, and an arm positioning assembly coupled with the head support and the arm base support for guiding corresponding movements of the head support and the arm base support so as to ensure a vertical trajectory of the power head assembly. The machine further includes a counterweight configuration to vertically move the power head assembly via a lever. The machine further includes an operational control assembly to selectively shift the power head assembly between a drilling operation and tapping operation. Therefore, the machine is suitable to make a hole with a diameter of 0.5 to 3 mm.

A drilling and tapping machine includes a power head assembly supported at a vertical orientation, a parallelogram arm structure including a head support and an arm base, and an arm positioning assembly coupled with the head support and the arm base support for guiding corresponding movements of the head support and the arm base support so as to ensure a vertical trajectory of the power head assembly. The machine further includes a counterweight configuration to vertically move the power head assembly via a lever. The machine further includes an operational control assembly to selectively shift the power head assembly between a drilling operation and tapping operation. Therefore, the machine is suitable to make a hole with a diameter of 0.5 to 3 mm.