The utility model relates to the technical field of PCB
processing equipment, in particular to a thick-bottom
copper PCB drilling
machine which comprises a protective shell, a window, a first electric guide rail, a
workbench, a first moving part, a fixed part, a drilling
machine and the like. A window is mounted on the protective shell, a first electric guide rail and a
workbench are mounted in the protective shell, a first moving part is mounted on the first electric guide rail, a fixing part is fixedly connected to the first moving part, a drilling
machine is mounted on the fixing part, a
drill bit is mounted on the drilling machine, and a variable
pitch structure is arranged on a
cutting section of the
drill bit. The tooth
pitch gradually changes from 0.8 mm at the front end to 1.2 mm at the rear end, a second electric guide rail is installed at the top end of the
workbench, and a second moving piece is installed on the second electric guide rail. According to the utility model, chips are forcibly broken through a variable-
pitch structure of the
drill bit and are matched with pulse
airflow impact of the air
nozzle, so that friction and adhesion of the chips to a hole wall are reduced.