Drilling positioning process

The invention relates to the technical field of drilling, in particular to a drilling positioning process which mainly comprises the steps that a pin is bonded to the inner face of a spiral groove of a drill bit through lubricating grease, the tip end faces a workpiece, and a gap of about 0.2 mm is kept between the tip end and the upper plane of the workpiece; slowly rotating the main shaft of the drilling machine by hand, simultaneously continuously moving the position of the workpiece relative to the axis of the drill bit and the position of the pin relative to the axis of the drill bit, gradually aligning the positions of the drill bit and the hole, and firstly, roughly aligning; and finally, enabling the motion trail of the tip end of the pin to coincide with the machining circle, positioning the workpiece or the main shaft at the moment, and finishing alignment. The process is characterized in that a reference reversal principle is utilized, the problem that whether the axis of a drill bit is coaxial wit